List of the Cenozoic life of Colorado

• , or fir tree Abies'' • †Abies longirostris • †Absarokius • †Absarokius abbotti – or unidentified comparable form • †Absarokius metoecus • †Absyrtus • †Absyrtus decrepitus – type locality for species • †Acaenitus • †Acaenitus defunctus – type locality for species • †Acalles • †Acalles exhumatus – type locality for species • †Acallomyia • †Acallomyia probolaea – type locality for species • †Acalyptus • †Acalyptus obtusus – type locality for species • †Acanthomyites – type locality for genus • †Acanthomyites aldrichi – type locality for species • †Acarictis – or unidentified comparable form • †Acarictis ryani • Acer • †Acer florissanti • †Acer fragile • †Acer macginitiei • †Acer oregonianum • †Achrestocoris – type locality for genus • †Achrestocoris cinerarius – type locality for species • †Acilius • †Acilius florissantensis – type locality for species • †Aciprion – type locality for genus • †Aciprion formosum – type locality for species • †Aciprion majus – type locality for species • †Acnemia • †Acnemia cyclosoma – type locality for species • †Acocephalus • †Acocephalus callosus – type locality for species • Acris • †Acritoparamys • †Acritoparamys atwateri • †Acritoparamys pattersoni • Acrostichum • †Acrostichum hesperium • †Acylophorus • †Acylophorus immotus – type locality for species • †Adalia • †Adalia subversa – type locality for species • †Adelocera • †Adelocera perantiqua – type locality for species • †Adelopsyche – type locality for genus • †Adelopsyche frustrans – type locality for species • †Adjidaumo • †Adjidaumo minimus • †Adjidaumo minutus • †Adocus'' • Aegialia • †Aegialia opaca • †Aelurodon • †Aelurodon asthenostylus • , or the long-necked camel. Heinrich Harder (1920). †Aepycamelus'' • †Aepycamelus giraffinus • Aeshna • †Aeshna larvata – type locality for species • †Aeshna solida – type locality for species • Agabus • †Agabus charon – type locality for species • †Agabus florissantensis – type locality for species • †Agabus infuscatus • †Agabus rathbuni – type locality for species • †Agallia • †Agallia abstructa – type locality for species • †Agallia flaccida – type locality for species • †Agallia instabilis – type locality for species • †Agallia lewisii – type locality for species • †Agathemera • †Agathemera reclusa – type locality for species • Agelaius'' • †Agelaius phoenicieus • †Agenia • †Agenia cockerellae – type locality for species • †Agenia saxigena – type locality for species • †Agnotocastor • †Agnotocastor coloradensis – type locality for species • Agoliinus • †Agoliinus plutonicus • Agrilus • †Agrilus liragus • †Agrilus praepolitus – type locality for species • †Agrion • †Agrion exsularis – type locality for species • †Agrion mascescens – type locality for species • †Agrion telluris – type locality for species • click beetle Agriotes'' • †Agriotes apicalis • †Agriotes comminutus – type locality for species • †Agriotes nearcticus – type locality for species • †Agromyza • †Agromyza praecursor – type locality for species • †Agulla • †Agulla protomaculata – type locality for species • †Agyrtes • †Agyrtes primoticus – type locality for species • †Ailanthus • †Ailanthus americana • †Ailanthus lesquereuxi • †Aleocharopsis • †Aleocharopsis caseyi – type locality for species • †Aleocharopsis secunda – type locality for species • †Alepidophora – type locality for genus • †Alepidophora cockerelli – type locality for species • †Alepidophora minor – type locality for species • †Alepidophora pealei – type locality for species • †Aletodon • †Aletodon gunnelli – or unidentified comparable form • Aleurites • †Aleurites glandulosa • †Alforjas – tentative report • †Alismaphyllites • †Alismaphyllites grandifolius • †Allantodiopsis • †Allantodiopsis erosa • †Allognathosuchus'' • †Allognathosuchus polyodon • †Allophaiomys • †Allophaiomys pliocaenicus • †Allophylus • †Allophylus flexifolia • †Alomatia – type locality for genus • †Alomatia fusca – type locality for species • Altica • †Altica renovata – type locality for species • †Alticonus – type locality for genus • †Alticonus gazini – type locality for species • †Alysia • †Alysia exigua – type locality for species • †Alysia petrina – type locality for species • †Alysia phanerognatha – type locality for species • †Alysia ruskii – type locality for species • Amara • †Amara cockerelli – type locality for species • †Amara danae – type locality for species • †Amara powellii – type locality for species • †Amara revocata – type locality for species • †Amara sterilis • †Amara veterata – type locality for species • †Amartus • †Amartus petrefactus – type locality for species • †Amauropilio • †Amauropilio atavus – type locality for species • †Amauropilio lacoei – type locality for species • †Amblycorypha – tentative report • †Amblycorypha perdita – type locality for species • †Amblyteles • †Amblyteles pealei – type locality for species • †Ambystoma • †Ambystoma alamosensis – type locality for species • †Ambystoma tigrinum • . Margret Flinsch (1932). †Amebelodon'' • †Amebelodon floridanus • Amelanchier • †Amelanchier peritula • †Amelanchier scudderi • Amia • †Ammophila • †Ammophila antiquella – type locality for species • †Ampelopsis • †Ampelopsis acerifolia • †Amphechinus • †Amphechinus horncloudi • †Amphicerus • †Amphicerus sublaevis • Amphicosmus • †Amphicosmus delicatulus – type locality for species • †Amphicyon • †Amphicyon galushai • †Amphicyon ingens • †Amphicyrta • †Amphicyrta inhaesa – type locality for species • †Amphimachairodus'' • †Amphimachairodus coloradensis • †Ampliconus – type locality for genus • †Ampliconus browni – type locality for species • †Anabrus • †Anabrus caudelli – type locality for species • Anas • †Anasa • †Anasa priscoputida – type locality for species • †Anatis • †Anatis resurgens – type locality for species • †Anchastus • †Anchastus diluvialis – type locality for species • †Anchastus eruptus – type locality for species • †Anchitherium • †Anconatus – type locality for genus • †Anconatus dorsuosus – type locality for species • †Anconatus niger – type locality for species • Andrena • †Andrena clavula – type locality for species • †Andrena grandipes – type locality for species • †Andrena hypolitha – type locality for species • †Andrena lagopus • †Andrena percontusa – type locality for species • †Andrena sepulta – type locality for species • †Andrenopteryx • †Andrenopteryx willardi • †Andrias • †Andrias matthewi • †Andricus • †Andricus myricae – type locality for species • †Anelaphus • †Anelaphus extinctus – type locality for species • †Anemia • †Anemia elongata • †Angustidens'' • †Angustidens vireti • †Anisonchus • †Anisonchus athelas – or unidentified comparable form • Anisotoma • †Anisotoma sibylla – type locality for species • †Ankylodon • †Ankylodon annectens • †Anobium • †Anobium durescens – type locality for species • †Anomala • †Anomala exterranea – type locality for species • †Anomala scudderi – type locality for species • †Anomalon • †Anomalon deletum – type locality for species • †Anomalon excisum – type locality for species • †Anomalon miocenicum – type locality for species • Anser • †Antas • †Antas crecca • jewel beetle Anthaxia'' • †Anthaxia exhumata – type locality for species • †Anthaxia prasina • †Antherophagus • †Antherophagus megalops – type locality for species • †Anthidium • †Anthidium exhumatum – type locality for species • †Anthidium scudderi – type locality for species • †Antholithes • †Antholithes amoenus • †Antholithes pediloides • fly †Anthomyia'' • †Anthomyia atavella – type locality for species • †Anthomyia laminarum – type locality for species • †Anthomyia persepulta – type locality for species • †Anthomyia winchesteri – type locality for species • Anthonomus • †Anthonomus concussus – type locality for species • †Anthonomus debilatus – type locality for species • †Anthonomus defossus – type locality for species • †Anthonomus evigilatus – type locality for species • †Anthonomus primordius – type locality for species • †Anthonomus rohweri – type locality for species • †Anthonomus soporus • †Anthophora • †Anthophora melfordi – type locality for species • †Antiacodon • †Antiacodon pygmaeus • , or pronghorn Antilocapra'' • †Antilocapra americana • †Antocha • †Antocha principialis – type locality for species • †Apanthesis – type locality for genus • †Apanthesis leuce – type locality for species • †Apatosciuravus • †Apatosciuravus bifax • †Aphaena • †Aphaena atava – type locality for species • Aphaenogaster • †Aphaenogaster donisthorpei – type locality for species • †Aphaenogaster mayri – type locality for species • †Apheliscus • †Aphelops • †Aphelops malacorhinus • †Aphelops megalodus • †Aphelops mutilus • †Aphidopsis • †Aphidopsis margarum – type locality for species • Aphodius • †Aphodius aboriginalis – type locality for species • †Aphodius florissantensis – type locality for species • †Aphodius granarioides – type locality for species • †Aphodius inundatus – type locality for species • †Aphodius laminicola – type locality for species • †Aphodius mediaevus – type locality for species • †Aphodius praeemptor – type locality for species • †Aphodius senex – type locality for species • †Aphodius shoshonis – type locality for species • spittlebug Aphrophora'' • Apion • †Apion attenuatum • †Apion cockerelli – type locality for species • †Apion evestigatum – type locality for species • †Apocymospermum • †Apocynophyllum • †Apocynophyllum lesquereuxi • †Apolysis • †Apolysis magister – type locality for species • †Aporema – type locality for genus • †Aporema praestrictum – type locality for species • †Apsilocephala • †Apsilocephala vagabunda – type locality for species • †Apternodus • †Apternodus iliffensis • Aquila • , or golden eagle †Aquila chysaetos'' • †Araneaovoius • †Araneaovoius columbiae • Araneus • †Araneus absconditus – type locality for species • †Araneus cinefactus – type locality for species • †Araneus delitus – type locality for species • †Araneus emertoni – type locality for species • †Araneus kinchloeae – type locality for species • †Araneus longimanus – type locality for species • †Araneus meeki – type locality for species • †Araneus vulcanalis – type locality for species • †Archaeochrysa • †Archaeochrysa creedei – type locality for species • †Archaeochrysa fracta – type locality for species • †Archaeochrysa paranervis – type locality for species • †Archaeomnium • †Archaeomnium brownii • †Archaeotherium'' • †Archaeotherium mortoni • †Archalia – type locality for genus • †Archalia femorata – type locality for species • †Archimyrmex – type locality for genus • †Archimyrmex rostratus – type locality for species • †Archiponera – type locality for genus • †Archiponera wheeleri – type locality for species • †Archiraphidia • †Archiraphidia somnolenta – type locality for species • †Archiraphidia tranquilla – type locality for species • †Archiraphidia tumulata – type locality for species • Arctobyrrhus • †Arctobyrrhus subcanus • †Arctocyon'' • †Arctocyon mumak • †Arctodontomys • †Arctodontomys nuptus • †Arctodontomys wilsoni • †Arctostylops – tentative report • †Arfia • †Arfia opisthotoma • †Arfia shoshoniensis • †Argia • †Argia aliena – type locality for species • †Arhopalus • †Arhopalus pavitus – type locality for species • , or birthwort †Aristolochia'' • †Aristolochia mortua • †Artimonius • †Artimonius australis • †Artimonius nocerai • †Artocarpus • †Artocarpus lessigiana • †Asilus • †Asilus amelanchieris – type locality for species • †Asilus curculionis – type locality for species • †Asilus florissantinus – type locality for species • †Asilus peritulus – type locality for species • †Asilus wickhami – type locality for species • tree, or pawpaw †Asimina'' • †Asimina vesperalis • Asio • †Aspicolpus • †Aspicolpus repertus – type locality for species • †Asplenium • †Asplenium delicatula – or unidentified comparable form • †Astephus • †Aster • †Aster florissantia • †Asterocarpinus • †Asterocarpinus perplexans • tree, which is related to cashews †Astronium'' • †Astronium calyx • †Astronium truncatum • Asynarchus • Ataenius • †Ataenius patescens – type locality for species • †Ataenius restructus – type locality for species • †Atalantycha • †Atalantycha humata – type locality for species • †Athalia • †Athalia wheeleri – type locality for species • Atheta • †Atheta florissantensis – type locality for species • click beetle †Athous'' • †Athous contusus – type locality for species • †Athous fractus – type locality for species • †Athous lethalis – type locality for species • †Athyana • †Athyana haydenii • †Atocus – type locality for genus • †Atocus cockerelli – type locality for species • †Atocus defessus – type locality for species • †Atrichops • †Atrichops hesperius – type locality for species • †Attagenus • †Attagenus aboriginalis – type locality for species • †Attagenus sopitus – type locality for species • †Aulacidea • †Aulacidea ampliforma – type locality for species • †Aulacidea progenetrix – type locality for species • †Aulacus • †Aulacus bradleyi – type locality for species • †Aulobaris • †Aulobaris anicilla – type locality for species • †Aulobaris circumscripta • †Aulobaris damnata – type locality for species • †Auraria – type locality for genus • †Auraria urbana – type locality for species • †Averrhoites • †Averrhoites affinis • †Axestemys – type locality for genus • †Axestemys puercensis – or unidentified comparable form • †Axestemys quinni – type locality for species • Aythya • †Aythya affinis • †Aythya americana • †Aztlanolagus'' ==B==

• †Baena • †Baena arenosa • †Baioconodon • †Baioconodon denverensis – type locality for species • †Baioconodon nordicus • †Baltemys • †Baltemys velogastros – type locality for species • †Baptemys • †Baptemys wyomingensis • †Barbouromeryx • †Baris • †Baris antediluviana – type locality for species • †Baris cremastorhynchoides – type locality for species • †Baris divisa – type locality for species • †Baris florissantensis – type locality for species • †Baris harlani – type locality for species • †Baris hoveyi – type locality for species • †Baris imperfecta – type locality for species • †Baris matura – type locality for species • †Baris nearctica – type locality for species • †Baris primalis – type locality for species • †Baris renovata – type locality for species • †Baris schucherti – type locality for species • †Barylambda'' • †Barylambda faberi – type locality for species • †Barylypa • †Barylypa primigena – type locality for species • †Bassus • †Bassus juvenilis – type locality for species • †Bassus miocenicus – type locality for species • †Bassus velatus – type locality for species • †Bathornis – type locality for genus • †Bathornis veredus – type locality for species • †Bathygenys • †Bathygenys alpha • †Bathyopsis'' • †Bathyopsis fissidens • †Belyta • †Belyta mortuella – type locality for species • Bembidion • †Bembidion bimaculatum • †Bembidion breve • †Bembidion coloradense • †Bembidion constricticolle • †Bembidium • †Bembidium florissantensis – type locality for species • †Bembidium obductum – type locality for species • †Bembidium tumulorum – type locality for species • †Beringiaphyllum • †Beringiaphyllum cupanioides • †Beris • †Beris miocenica – type locality for species • , or birch tree Betula'' • †Betula stevensoni • Bibio • †Bibio capnodes – type locality for species • †Bibio cockerelli – type locality for species • †Bibio excurvatus – type locality for species • †Bibio explanatus – type locality for species • †Bibio jamesi – type locality for species • †Bibio podager – type locality for species • †Bibio vetus – type locality for species • †Bibio vulcanius – type locality for species • †Bibio wickhami – type locality for species • †Bibiodes • †Bibiodes intermedia – type locality for species • †Bidessus • †Bidessus laminarum – type locality for species • Bison • †Bison antiquus – or unidentified comparable form • , or long-horned bison †Bison latifrons'' • †Blapstinus • †Blapstinus linellii – type locality for species • †Blechnum • †Blechnum anceps • Bledius • †Bledius osborni • †Bledius primitiarum – type locality for species • †Bledius soli – type locality for species • †Bledius suturalis • †Blickomylus • †Blickomylus galushai • Boletina • †Boletina hypogaea – type locality for species • †Borealosuchus'' • †Borophagus • †Borophagus pugnator • †Bouromeryx • †Bouromeryx americanus – type locality for species • †Brachinus • †Brachinus newberryi – type locality for species • †Brachinus repressus – type locality for species • †Brachycrus'' • †Brachyerix • †Brachyerix macrotis • Brachylagus • †Brachylagus coloradoensis – type locality for species • †Brachyprotoma • †Brachyprotoma obtusata • †Brachypsalis • †Brachypsalis modicus • †Brachyrhynchocyon • †Brachyspathus – type locality for genus • †Brachyspathus curiosus – type locality for species • †Brachytarsus – tentative report • †Brachytarsus dubius – type locality for species • Bracon • †Bracon abstractus – type locality for species • †Bracon cockerelli – type locality for species • †Bracon resurrectus – type locality for species • leaf beetle †Bruchus'' • †Bruchus aboriginalis – type locality for species • †Bruchus anilis – type locality for species • †Bruchus antaeus – type locality for species • †Bruchus bowditchi – type locality for species • †Bruchus carpophiloides – type locality for species • †Bruchus dormescens – type locality for species • †Bruchus exhumatus – type locality for species • †Bruchus henshawi – type locality for species • †Bruchus osborni – type locality for species • †Bruchus succintus – type locality for species • †Bruesisca • †Bruesisca submersus – type locality for species • Bubo • , or great horned owl †Bubo virginianus'' • Bufo • †Bufo cognatus • †Bufo douglassi • †Bufo woodhousei • †Bunophorus • †Bunophorus grangeri • †Bunophorus pattersoni • †Bunophorus robustus • †Bunophorus sinclairi • †Buprestis • †Buprestis florissantensis – type locality for species • †Buprestis megistarche – type locality for species • †Buprestis scudderi – type locality for species • †Bursera • †Bursera serrulata • hawk Buteo'' • †Buteo fluviaticus – type locality for species • Byrrhus • †Byrrhus eximius • †Byrrhus romingeri • †Bythoscopus • †Bythoscopus lapidescens – type locality for species ==C==

• †Cacalydus – type locality for genus • †Cacalydus exstirpatus – type locality for species • †Cacalydus lapsus – type locality for species • †Cacogaster – type locality for genus • †Cacogaster novamaculatus – type locality for species • †Cacoschistus – type locality for genus • †Cacoschistus maceriatus – type locality for species • †Caenocholax • †Caenocholax barkleyi – type locality for species • †Caenocholax palusaxus – type locality for species • †Caesalpinia'' • †Caesalpinia pecorae • †Caesalpinites • †Caesalpinites acuminatus • †Caesalpinites coloradicus • †Calamagras – type locality for genus • †Calamagras angulatus – type locality for species • †Calamagras murivorus – type locality for species • †Calamagras talpivorus – type locality for species • †Calandrites • †Calandrites cineratius • †Calandrites defessus • †Calandrites hindsi – type locality for species • †Calandrites ursorum – type locality for species • †Calcarius • , or Lapland longspur †Calcarius lapponicus'' • †Calcarius ornatus • †Calippus • †Calippus regulus • †Caliroa • †Caliroa micrarche – type locality for species • †Caliroa mimus – type locality for species • †Caliroa revelata – type locality for species • †Callidiopsites – type locality for genus • †Callidiopsites grandiceps – type locality for species • †Callimoxys • †Callimoxys primordialis – type locality for species • †Callomyia – tentative report • †Callomyia hypolitha – type locality for species • Calosoma • †Calosoma calvini – type locality for species • †Calosoma cockerelli – type locality for species • †Calosoma emmonsi – type locality for species • †Calyptapis – type locality for genus • †Calyptapis florissantensis – type locality for species • †Camelops'' • †Camelops hesternus • †Camerotops • †Camerotops solidatus – type locality for species • Camponotus • †Camponotus fuscipennis – type locality for species • †Camponotus microcephalus – type locality for species • †Camponotus petrifactus – type locality for species • Canis • †Canis edwardii – or unidentified comparable form • †Canis latrans • †Cantius • †Cantius abditus • †Cantius frugivorus • †Cantius mckennai • †Cantius ralstoni • †Capnobotes • †Capnobotes silens • †Capnochroa • †Capnochroa senilis – type locality for species • †Capsus • †Capsus lacus – type locality for species • †Capsus obsolefactus – type locality for species • †Carabites – tentative report • †Carabites arapahoensis – type locality for species • Carabus • †Carabus jeffersoni – type locality for species • †Cardichelyon • †Cardichelyon rogerwoodi – or unidentified comparable form • †Cardiolophus • †Cardiolophus radinskyi • click beetle †Cardiophorus'' • †Cardiophorus cockerelli – type locality for species • †Cardiophorus deprivatus – type locality for species • †Cardiophorus exhumatus – type locality for species • †Cardiophorus florissantensis – type locality for species • †Cardiophorus lithographicus – type locality for species • †Cardiophorus requiescens – type locality for species • Cardiospermum • leaf†Cardiospermum coloradensis'' • †Cardiospermum terminalis • †Cariblattoides • †Cariblattoides labandeirai – type locality for species • †Carmelus • †Carmelus gravatus – type locality for species • †Carmelus sepositus – type locality for species • †Carpites • †Carpites gemmaceus • †Carpites miliodes • †Carpocyon • †Carpocyon compressus • †Carpocyon robustus • Carpodacus • †Carpodacus cassinii • †Carpodaptes • †Carpodaptes aulacodon – type locality for species • †Carpodaptes cygneus • †Carpophilus • †Carpophilus restructus – type locality for species • , or hickory tree Carya'' • †Carya antiquorum • †Carya florissantensis • †Carya libbeyi • Castanea • †Castanea dolichophylla • †Castanea intermedia • †Catobaris – type locality for genus • †Catobaris coenosa – type locality for species • †Catopamera – type locality for genus • †Catopamera augheyi – type locality for species • †Catopamera bradleyi – type locality for species • †Catopsalis • †Catopsalis alexanderi – type locality for species • †Catopsylla – type locality for genus • †Catopsylla crawfordi – type locality for species • †Catopsylla prima – type locality for species • †Cecidomyia – tentative report • †Cecidomyia pontaniiformis • Cedrela • †Cedrela lancifolia • †Cedrelospermum • †Cedrelospermum lineatum • †Cedromus • †Cedromus wardi • †Celastrilex – type locality for genus • †Celastrilex artocarpidioides – type locality for species. Formerly classified as Celastrinites artocarpidioides. • †Celastrinites • †Celastrilex artocarpidioides – type locality for species. Later reclassified as Celastrilex artocarpidioides. • , or staff vine †Celastrus'' • †Celastrus typica • †Celastrus winchesteri • Celtis • †Celtis mccoshii • †Centetodon • †Centetodon magnus • †Centetodon marginalis • †Centetodon patratus – type locality for species • †Centimanomys • †Centimanomys galbreathi • †Centimanomys major • †Centrinus • †Centrinus hypogaeus – type locality for species • †Centrinus obnuptus – type locality for species • †Centrinus vulcanicus – type locality for species • †Centrocerus • †Centrocerus urophasianus • †Centron – type locality for genus • †Centron moricollis – type locality for species • †Cephalomyrmex – type locality for genus • †Cephalomyrmex rotundatus – type locality for species • †Ceratina • †Ceratina disrupta – type locality for species • †Ceratosuchus'' – type locality for genus • †Ceratosuchus burdoshi – type locality for species • †Ceraturgus • †Ceraturgus praecursor – type locality for species • Cercidiphyllum • †Cercidiphyllum arcticum • Cercis • †Cercis parvifolia • †Cercocarpus • †Cercocarpus myricaefolius • †Cercopis • †Cercopis cephalinus – type locality for species • †Cercopis suffocata – type locality for species • †Ceropalites – type locality for genus • †Ceropalites infelix – type locality for species • †Ceruchus • †Ceruchus fuchsii – type locality for species • Cervus • , or red deer †Cervus elaphus'' • Ceutorhynchus • †Ceutorhynchus blaisdelli – type locality for species • †Ceutorhynchus clausus – type locality for species • †Ceutorhynchus compactus – type locality for species • †Ceutorhynchus degravatus – type locality for species • †Ceutorhynchus duratus – type locality for species • †Ceutorhynchus irvingi – type locality for species • Chaetodipus • †Chaetodipus hispidus • †Chaetopleurophora • †Chaetopleurophora laminarum – type locality for species • †Chaetoptelea • †Chaetoptelea microphylla • †Chalcis • †Chalcis perdita – type locality for species • †Chalcis praevalens • †Chalcis praevolans – type locality for species • †Chalcis tortilis – type locality for species • †Chalepus • †Chalepus americanus – type locality for species • †Chalybion • †Chalybion mortuum – type locality for species • †Chamaecyparis • †Chamaecyparis linguaefolia • palms †Chamaedorea'' • †Chamaedorea danae • †Chaneya • †Chaneya tenuis'' • Charina • †Charina prebottae • †Chauliognathus • †Chauliognathus pristinus – type locality for species • †Cheilophis – type locality for genus • †Cheilophis huerfanoensis – type locality for species • Cheilosia • †Cheilosia hecate – type locality for species • †Cheilosia miocenica – type locality for species • †Cheilosia scudderi – type locality for species • †Cheilosia sepultula – type locality for species • †Chelonarium • †Chelonarium montanum – type locality for species • †Chelonus • †Chelonus depressus – type locality for species • †Chelonus muratus – type locality for species • †Chelonus solidus – type locality for species • †Chilocorus • †Chilocorus ulkei – type locality for species • †Chionaemopsis – type locality for genus • †Chionaemopsis quadrifasciatus – type locality for species • †Chiromyoides • †Chiromyoides caesor • †Chiromyoides gigas • †Chiromyoides potior – type locality for species • midge Chironomus'' • †Chironomus almelanderi – type locality for species • †Chironomus depletus – type locality for species • †Chironomus patens – type locality for species • †Chironomus pausatus – type locality for species • †Chironomus primaevus – type locality for species • †Chironomus pristinus – type locality for species • †Chironomus proterus – type locality for species • †Chironomus requiescens – type locality for species • †Chironomus scudderiellus – type locality for species • Chondestes • †Chondestes grammacus • †Chriacus • †Chriacus gallinae • †Chrysis • †Chrysis miocenica – type locality for species • †Chrysis rohweri – type locality for species • †Chrysobothris • †Chrysobothris coloradensis – type locality for species • †Chrysobothris gahani – type locality for species • †Chrysobothris haydeni – type locality for species • †Chrysobothris suppressa – type locality for species • †Chrysogaster • †Chrysogaster antiquarius – type locality for species • Chrysomela • †Chrysomela vesperalis – type locality for species • †Cicada • †Cicada grandiosa – type locality for species • †Cicadella • †Cicadella scudderi – type locality for species • †Cimbex • †Cimbex vetusculus – type locality for species • †Cimexomys • †Cimexomys arapahoensis – type locality for species • †Cimexomys minor • , or cinnamon tree Cinnamomum'' • †Cinnamomum sezannense • †Cissites • †Cissites rocklandensis • Cissus • †Cissus marginata • †Cixius – tentative report • †Cixius proavus – type locality for species • †Cladius • †Cladius petrinus – type locality for species • †Cladoneura – type locality for genus • †Cladoneura willistoni – type locality for species • †Cladura • †Cladura integra – type locality for species • †Cladura maculata – type locality for species • †Clastoptera • †Clastoptera comstocki – type locality for species • weevil †Cleonus'' • †Cleonus degeneratus – type locality for species • †Cleonus estriatus – type locality for species • †Cleonus exterraneus – type locality for species • †Cleonus foersteri – type locality for species • †Cleonus primoris – type locality for species • †Cleonus rohweri – type locality for species • †Closterocoris • †Closterocoris elegans – type locality for species • †Clubiona • †Clubiona arcana • †Clubiona curvispinosa – type locality for species • †Clubiona eversa – type locality for species • †Clubiona florissanti – type locality for species • †Clytus • †Clytus pervetustus – type locality for species • ladybug †Coccinella'' • †Coccinella florissantensis – type locality for species • †Coccinella sodoma – type locality for species • †Coccotorus • †Coccotorus principalis – type locality for species • †Coccotorus requiescens – type locality for species • †Coeliodes • †Coeliodes primotinus – type locality for species • Colaptes • †Colaptes auratus • †Colaspis • †Colaspis aetatis – type locality for species • †Colaspis diluvialis – type locality for species • †Colaspis proserpina – type locality for species • †Colastes • †Colastes abrogatus – type locality for species • †Colemanus – type locality for genus • †Colemanus keeleyorum – type locality for species • †Collops • †Collops desuetus – type locality for species • †Collops extrusus – type locality for species • †Collops priscus – type locality for species • †Colopterus • †Colopterus pygidialis – type locality for species • †Colpoclaenus • †Colpoclaenus keeferi • †Colubrina'' • †Colubrina spireaefolia • †Colubrina spireafollia • †Compsemys • †Compsemys victa • †Comptosia – type locality for genus • †Comptosia miranda – type locality for species • †Conacodon • †Conacodon delphae – type locality for species • †Conacodon harbourae – type locality for species • †Conacodon matthewi – type locality for species • †Coniatus • †Coniatus refractus • Conotelus • †Conotelus obscurus • weevil †Conotrachelus'' • †Conotrachelus florissantensis – type locality for species • †Contogenys – or unidentified related form • †Convolvulites • †Convolvulites orichitus • †Conzattia • †Conzattia coriacea – type locality for species • †Copecion • †Copecion brachypternus • †Copelemur • †Copelemur praetutus • †Cophocoris – type locality for genus • †Cophocoris tenebricosus – type locality for species • †Cophura • †Cophura antiquella – type locality for species • †Copidita • †Copidita miocenica – type locality for species • †Coptochromus – type locality for genus • †Coptochromus manium – type locality for species • †Cordilura • †Cordilura exhumata – type locality for species • †Corethra • †Corethra exita – type locality for species • Corixa • †Corixa immersa – type locality for species • †Corixa vanduzeei – type locality for species • †Corizus • †Corizus abditivus – type locality for species • †Corizus celatus – type locality for species • †Corizus somnurnus – type locality for species • †Cormocyon • †Cormocyon copei • †Cormohipparion'' • †Cormohipparion quinni • †Cormohipparion sphenodus • Cornus • †Cornus hyperborea • †Corphyra • †Corphyra calypso – type locality for species • Corticaria • †Corticaria aeterna – type locality for species • †Corticaria egregia – type locality for species • †Corticaria occlusa – type locality for species • †Corticaria petrefacta – type locality for species • Corvus • †Corvus brachyrhynchos • †Corvus corax • †Corylus • †Corylus insignis • . Heinrich Harder (1920). †Coryphodon'' • †Coryphodon armatus • †Coryphodon eocaenus • Cossonus • †Cossonus gabbii – type locality for species • †Cossonus rutus – type locality for species • †Cotinus • †Cotinus fraterna • †Crabro • †Crabro longaevus – type locality for species • †Cratacanthus • †Cratacanthus florissantensis – type locality for species • , or hawthorn tree Crataegus'' • †Crataegus copeana • †Crataegus hendersoni • †Crataegus nupta • †Cremastorhynchus • †Cremastorhynchus stabilis • †Cremastosaurus – type locality for genus • †Cremastosaurus carinicollis – type locality for species • †Cremastosaurus rhambastes – type locality for species • †Cremnops • †Cremnops florissanticola – type locality for species • †Creniphilites – type locality for genus • †Creniphilites orpheus – type locality for species • †Crioceridea – type locality for genus • †Crioceridea dubia – type locality for species • Crotalus • , or prairie rattlesnake †Crotalus viridis'' • †Croton • †Croton furculatum • †Cryptagriotes – type locality for genus • †Cryptagriotes minusculus – type locality for species • †Cryptocephalus • †Cryptocephalus miocenus – type locality for species • †Cryptocheilus • †Cryptocheilus florissantensis – type locality for species • †Cryptocheilus hypogaeus – type locality for species • †Cryptocheilus laminarum – type locality for species • †Cryptocheilus scudderi – type locality for species • †Cryptocheilus senex – type locality for species • †Cryptochromus – type locality for genus • †Cryptochromus letatus – type locality for species • Cryptohypnus • †Cryptohypnus exterminatus – type locality for species • †Cryptohypnus hesperus – type locality for species • silken fungus beetle Cryptophagus'' • †Cryptophagus bassleri – type locality for species • †Cryptophagus petricola – type locality for species • †Cryptophagus scudderi – type locality for species • Cryptorhynchus • †Cryptorhynchus annosus • †Cryptorhynchus coloradensis – type locality for species • †Cryptorhynchus durus – type locality for species • †Cryptorhynchus evinctus – type locality for species • †Cryptorhynchus fallii – type locality for species • †Cryptorhynchus kerri – type locality for species • †Cryptorhynchus profusus – type locality for species • †Cryptus • †Cryptus delineatus – type locality for species • †Ctereacoris – type locality for genus • †Ctereacoris primigenus – type locality for species • mosquito Culex'' • †Culex winchesteri – type locality for species • †Curculio • †Curculio anicularis – type locality for species • †Curculio beeklyi – type locality for species • †Curculio curvirostris – type locality for species • †Curculio duttoni – type locality for species • †Curculio extinctus – type locality for species • †Curculio femoratus • †Curculio flexirostris – type locality for species • †Curculio florissantensis – type locality for species • †Curculio minusculoides – type locality for species • †Curculio minusculus • †Curculio restrictus – type locality for species • †Cursoricoccyx – type locality for genus • †Cursoricoccyx geraldinae – type locality for species • †Cuterebra • †Cuterebra ascarides – type locality for species • †Cuterebra bibosa – type locality for species • †Cychramites – type locality for genus • †Cychramites hirtus – type locality for species • †Cyclotrachelus • †Cyclotrachelus tenebricus – type locality for species • †Cydamus • †Cydamus robustus – type locality for species • †Cydnopsis • †Cydnopsis handlirschi – type locality for species • †Cylindrodon • †Cylindrodon nebraskensis • †Cylindrotoma • †Cylindrotoma veterana – type locality for species • †Cynarctoides • †Cynarctoides acridens • †Cynelos'' • Cynomys • †Cynomys niobrarius • †Cynomys spenceri – or unidentified comparable form • †Cyperacites • †Cyperacites lacustris – type locality for species • †Cyphomyia • †Cyphomyia rohweri – type locality for species • Cyphon • †Cyphus • †Cyphus florissantensis – type locality for species • †Cypris • †Cypris florissantensis – type locality for species • †Cyrtapis – type locality for genus • †Cyrtapis anomala – type locality for species • †Cyrtomon • †Cyrtomon subterraneus – type locality for species • Cytilus • †Cytilus tartarinus – type locality for species • †Cyttaromyia • †Cyttaromyia obdurescens – type locality for species • †Cyttaromyia princetoniana – type locality for species • †Cyttaromyia reclusa – type locality for species ==D==

• †Daphne • †Daphne septentrionalis • Daphnia • †Daphoenus'' • †Daphoenus vetus • †Dartonius • †Dartonius jepseni • †Dascillus • †Dascillus lithographicus – type locality for species • †Davidia • †Davidia antiqua • †Deleaster • †Deleaster grandiceps – type locality for species • †Delphax • †Delphax senilis – type locality for species • †Delphax veterum – type locality for species • †Demophorus • †Demophorus antiquus – type locality for species • †Denaeaspis – type locality for genus • †Denaeaspis chelonopsis – type locality for species • †Dendragopus • †Dendragopus obscurus • , or hayscented ferns †Dennstaedtia'' • †Dennstaedtia americana • †Denverus – type locality for genus • †Denverus middletoni – type locality for species • †Dermatobia • †Dermatobia hydropica – type locality for species • †Dermestes • †Dermestes tertiarius – type locality for species • †Derobrochus – type locality for genus • †Derobrochus abstractus – type locality for species • †Derobrochus caenulentus – type locality for species • †Derobrochus commoratus – type locality for species • †Derobrochus craterae – type locality for species • †Derobrochus frigescens – type locality for species • †Derobrochus marcidus – type locality for species • †Derobrochus typharum – type locality for species • †Desmatoclaenus • †Desmatoclaenus protogonioides – or unidentified comparable form • †Desmatomyia – type locality for genus • †Desmatomyia scopulicornis – type locality for species • †Detyopsis – type locality for genus • †Detyopsis packardi – type locality for species • †Detyopsis scudderi – type locality for species • †Deviacer • †Diabrotica • †Diabrotica bowditchiana – type locality for species • †Diabrotica exesa – type locality for species • †Diabrotica florissantella – type locality for species • †Diabrotica uteana – type locality for species • †Diacodexis • †Diacodexis kelleyi • †Diacodexis metsiacus – or unidentified comparable form • †Diacodexis minutus • †Diacodexis primus • †Diacodexis secans – or unidentified comparable form • †Diacodon • †Diacodon alticuspis – or unidentified comparable form • †Dialysis • †Dialysis revelata – type locality for species • Dialytes • Dialytodius • †Dialytodius decipiens • Diamesa • †Diamesa extincta – type locality for species • †Dianthidium • †Dianthidium tertiarium – type locality for species • †Diaplegma – type locality for genus • †Diaplegma abductum – type locality for species • †Diaplegma haldemani – type locality for species • †Diaplegma occultorum – type locality for species • †Diaplegma ruinosum – type locality for species • †Diaplegma venerabile – type locality for species • †Diaplegma veterascens – type locality for species • Diceratherium. Robert Bruce Horsfall (1913). †Diceratherium • †Diceratherium tridactylum • †Dicerca • †Dicerca eurydice – type locality for species • Dicranomyia • †Dicranomyia faecarius – type locality for species • †Dicranomyia fontainei – type locality for species • †Dicranomyia fragilis – type locality for species • †Dicranomyia inferna – type locality for species • †Dicranomyia loewi – type locality for species • †Dicranomyia longipes – type locality for species • †Dicranomyia primitiva • †Dicranomyia rohweri – type locality for species • †Dicranomyia saxetana – type locality for species • †Dicranomyia stagnorum • †Dicranomyia stigmosa • hairy-eyed cranefly †Dicranota'' • †Dicranota cockerelli – type locality for species • †Dictyla • †Dictyla veterana – type locality for species • †Dictyophara • †Dictyophara bouvei – type locality for species • †Dictyoraphidia • †Dictyoraphidia veterana – type locality for species • †Didelphodus • †Didelphodus absarokae • †Didelphodus altidens • †Didymictis • †Didymictis altidens • †Didymictis leptomylus • †Didymictis protenus • †Didymictis proteus – or unidentified comparable form • †Didymictis vancleveae • †Didymosphaeria • †Didymosphaeria betheli • †Dikkomys • †Dilaropsis – type locality for genus • †Dilaropsis ornatus – type locality for species • †Dillenites • †Dillenites garfieldensis • †Dilophodon • †Dineura • †Dineura cockerelli – type locality for species • †Dineura fuscipennis – type locality for species • †Dineura laminarum – type locality for species • †Dineura microsoma – type locality for species • †Dineura saxorum – type locality for species • . Robert Bruce Horsfall (1913). †Dinictis'' • †Dinidorites – type locality for genus • †Dinidorites margiformis – type locality for species • †Dinoderus • †Dinoderus cuneicollis – type locality for species • †Dinohippus • †Dinohippus interpolatus – or unidentified comparable form • †Dioctria • †Dioctria florissantina – type locality for species • †Dioctria pulveris – type locality for species • Dioscorea • †Diplodipelta – type locality for genus • †Diplodipelta reniptera • †Diplolophus • †Diplolophus insolens • †Diploptera • †Diploptera gemini – type locality for species • †Diploptera savba – type locality for species • †Diploptera vladimir – type locality for species • Diplotaxis – tentative report • Diplotaxis • †Diplotaxis aurora – type locality for species • †Diplotaxis simplicipes – type locality for species • Dipodomys • '', or Ord's kangaroo rat †Dipodomys ordii • †Dipsalidictis • †Dipsalidictis transiens • Dipteronia • †Dipteronia brownii • †Dipteronia insignis • †Dissacus • †Dissacus navajovius • †Docimus – type locality for genus • †Docimus psylloides – type locality for species • †Docirhynchus • †Docirhynchus terebrans – type locality for species • Dodonaea • †Dodonaea umbrina • ant Dolichoderus'' • †Dolichoderus antiquus – type locality for species • †Dolichoderus kohlsi – type locality for species • †Dolichoderus rohweri – type locality for species • †Dolichomyia • †Dolichomyia tertiaria – type locality for species • †Dolichomyia testea – type locality for species • Dolurgus • †Dolurgus pumilus • †Dombeyopsis • †Dombeyopsis magnifica • †Dominickus – type locality for genus • †Dominickus castnioides – type locality for species • †Domnina • †Domnina gradata • †Domnina thompsoni – or unidentified comparable form • †Domninoides • Donacia • Dorytomus • †Dorytomus coercitus – type locality for species • †Dorytomus williamsi – type locality for species • †Doxocopa • †Doxocopa wilmattae – type locality for species • †Drassonax • †Drassonax harpagops – type locality for species • †Drepanomeryx – tentative report • †Drepanomeryx falciformis • †Dromomeryx'' • †Dromomeryx borealis – type locality for species • †Dryobius • †Dryobius miocenicus – type locality for species • Dryocoetes – type locality for genus • †Dryocoetes diluvialis – type locality for species • Dryopteris • †Dryopteris guyottii • †Dryopteris lakesi • †Dryopteris serrata • Dyschirius • †Dyscoletes • †Dyscoletes soporatus – type locality for species • †Dysdercus • †Dysdercus cinctus – type locality for species • †Dysdercus unicolor – type locality for species • †Dyspetochrysa • †Dyspetochrysa vetuscula – type locality for species ==E==

• †Earinus • †Earinus saxatilis – type locality for species • †Ecclesimus • †Ecclesimus tenuiceps • †Echinaphis – type locality for genus • †Echinaphis rohweri – type locality for species • †Echmatemys'' • †Echmatemys lativertebralis – or unidentified comparable form • †Echmatemys septaria • †Echmatemys stevensoniana – tentative report • †Ectobius • †Ectobius kohlsi – type locality for species • †Ectocion • †Ectocion major • †Ectocion medituber • †Ectocion osbornianus • †Ectocion parvus • †Ectoconus • †Ectoconus ditrigonus • †Ectoganus • †Ectoganus lobdelli • †Ectopria • †Ectopria laticollis – type locality for species • †Ectypodus • †Ectypodus childei – or unidentified comparable form • †Ectypodus musculus – type locality for species • †Ectypodus tardus • †Elaeomyrmex – type locality for genus • †Elaeomyrmex coloradensis – type locality for species • †Elaeomyrmex gracilis – type locality for species • †Elaphidion • †Elaphidion fracticorne – type locality for species • Elaphropus • †Elaphropus incurvus • †Elater • †Elater florissantensis – type locality for species • †Elater rohweri – type locality for species • †Elater scudderi – type locality for species • Eleodes • †Eleodes granulatus – or unidentified comparable form • †Elidiptera • †Elidiptera regularis – type locality for species • †Emiliana – type locality for genus • †Emiliana alexandri – type locality for species • daggerfly †Empis'' • †Empis florissantana – type locality for species • †Empis infossa – type locality for species • †Empis miocenica – type locality for species • †Empis perdita – type locality for species • †Enallagma • †Enallagma florissantella – type locality for species • †Enallagma mortuella – type locality for species • †Enallagma oblisum – type locality for species • Engelhardtia • †Engelhardtia uintaensis – type locality for species • Enochrus • †Enochrus hamiltoni • †Enochrus scudderi – type locality for species • †Entimus • †Entimus primordialis – type locality for species • . Charles R. Knight (1890s). †Eobasileus'' • †Eobasileus cornutus • †Eobruneria – type locality for genus • †Eobruneria tessellata – type locality for species • †Eobumbatrix • †Eobumbatrix latebrosa – type locality for species • †Eocleonus – type locality for genus • †Eocleonus subjectus – type locality for species • †Eocuculus – type locality for genus • †Eocuculus cherpinae – type locality for species • †Eodiplurina – type locality for genus • †Eodiplurina cockerelli – type locality for species • †Eoerianthus – type locality for genus • †Eoerianthus eocaenicus – type locality for species • †Eoerianthus multispinosa – type locality for species • †Eoformica – type locality for genus • †Eoformica globularis – type locality for species • †Eoformica magna – type locality for species • †Eoformica pinguis – type locality for species • †Eofulgorella – type locality for genus • †Eofulgorella bradburyi – type locality for species • †Eoglyptosaurus • †Eoglyptosaurus donohoei • †Eogryllus • †Eogryllus elongatus – type locality for species • †Eogryllus unicolor – type locality for species • †Eohemichroa • †Eohemichroa eophila – type locality for species • . Heinrich Harder (1920). †Eohippus'' • †Eohippus angustidens • †Eolestes – type locality for genus • †Eolestes syntheticus – type locality for species • †Eoliarus – type locality for genus • †Eoliarus quadristictus – type locality for species • †Eomerope – type locality for genus • †Eomerope tortriciformis – type locality for species • †Eomogoplistes – type locality for genus • †Eomogoplistes longipennis – type locality for species • †Eomyza – type locality for genus • †Eomyza holoptera – type locality for species • †Eopachylosticta • †Eopachylosticta byrami – type locality for species • †Eophlebomyia – type locality for genus • †Eophlebomyia claripennis – type locality for species • †Eopimpla – type locality for genus • †Eopimpla grandis – type locality for species • †Eosacantha – type locality for genus • †Eosacantha delocranioides – type locality for species • †Eostentatrix • †Eostentatrix cockerelli – type locality for species • †Eostentatrix ostentata – type locality for species • †Eotetrix – type locality for genus • †Eotetrix unicornis – type locality for species • †Eothes – type locality for genus • †Eothes elegans – type locality for species • †Eotingis – type locality for genus • †Eotingis antennata – type locality for species • †Eotitanops'' • †Eotitanops borealis • †Eotrella – type locality for genus • †Eotrella mira – type locality for species • †Eotylopus • †Eozacla • †Eozacla arachnomorpha – type locality for species • †Eozacla problematica – type locality for species • †Epallagites – type locality for genus • †Epallagites avus – type locality for species • †Epanuraea – type locality for genus • †Epanuraea ingenita – type locality for species • †Ephalus • †Ephalus adumbratus – type locality for species • , which includes the joint-pines and Mormon tea Ephedra'' • †Ephedra miocenica • †Ephemera • †Ephemera exsucca – type locality for species • †Ephemera howarthi – type locality for species • †Ephemera immobilis – type locality for species • †Ephemera interempta – type locality for species • †Ephemera macilenta – type locality for species • †Ephemera pumicosa – type locality for species • †Ephemera tabifica – type locality for species • †Epicaerus • †Epicaerus effossus • †Epicaerus eradicatus • †Epicaerus evigoratus • †Epicaerus exanimis • †Epicaerus excissus – type locality for species • †Epicaerus saxatilis • †Epicaerus subterraneus • †Epicaerus terrosus • Epicauta • †Epicauta subneglecta – type locality for species • †Epicyon'' • †Epicyon haydeni • †Epihippus • †Epihippus gracilis • †Epiphloeus • †Epiphloeus pristinus – type locality for species • Epuraea • †Epuraea planulata • †Epyris • †Epyris deletus – type locality for species • †Equisetum • †Equisetum florissantense • †Equisetum winchesteri • Equus • †Equus conversidens • †Equus francisci • †Equus scotti – or unidentified comparable form • , also known as the Hagerman horse or American zebra †Equus simplicidens'' • Eremophila • †Eremophila alpestris • Erethizon • Eriocampa • †Eriocampa bruesi – type locality for species • †Eriocampa celata – type locality for species • †Eriocampa disjecta – type locality for species • †Eriocampa pristina – type locality for species • †Eriocampa scudderi – type locality for species • †Eriocampa synthetica – type locality for species • †Eriophyes – tentative report • †Eriophyes beutenmulleri • †Eristalis • †Eristalis lapideus – type locality for species • †Ernobius • †Ernobius effetus – type locality for species • †Erycus • †Erycus brevicollis – type locality for species • †Esthonyx • †Esthonyx acutidens • †Esthonyx bisulcatus • †Esthonyx spatularius • †Eterochalcis • †Eterochalcis scudderi – type locality for species • moth †Ethmia'' • †Ethmia mortuella – type locality for species • †Etirocoris – type locality for genus • †Etirocoris infernalis – type locality for species • †Eubazus • †Eubazus wilmattae – type locality for species • †Eucallimyia • †Eucallimyia fortis – type locality for species • †Eucicones • †Eucicones oblongopunctata – type locality for species • Eucnecosum • †Eucnecosum brachypterum • †Eucnecosum brunnescens • †Eucnecosum tenue • †Eucnemis • †Eucnemis antiquatus – type locality for species • tree †Eucommia'' • †Eucommia serrata • †Eucorites – type locality for genus • †Eucorites serescens – type locality for species • †Eudasytites – type locality for genus • †Eudasytites listriformis – type locality for species • †Eudomus • †Eudomus pinguis • †Eudomus robustus • Eugenia • †Eugenia americana • †Eugenia arenaceaeformis • †Eugnamptidea – type locality for genus • †Eugnamptidea florissantensis – type locality for species • †Eugnamptidea robusta – type locality for species • †Eugnamptidea tertiaria – type locality for species • †Eulithomyrmex – type locality for genus • †Eulithomyrmex rugosus'' – type locality for species • †Eulithomyrmex striatus – type locality for species • †Eumys • †Eumys brachyodus • †Eumys elegans • †Euparius • †Euparius adumbratus – type locality for species • †Euparius arcessitus – type locality for species • Euphorbia • †Euphorbia minuta • †Euphorus • †Euphorus indurescens – type locality for species • †Eurhinus • †Eurhinus occultus – type locality for species • †Euroxenomys • †Eurytoma • †Eurytoma sepulta – type locality for species • †Eurytoma sequax – type locality for species • Eutamias • (formerly Eutamias minimus), or least chipmunk †Eutamias minimus'' – or unidentified comparable form • †Eutrichopleurus • †Eutrichopleurus miocenus – type locality for species • †Eutypomys • †Eutypomys parvus • †Evopes • †Evopes occubatus – type locality for species • †Evopes veneratus – type locality for species • Exechia • †Exechia priscula – type locality for species • †Exenterus • †Exenterus dormitans – type locality for species • †Exetastes • †Exetastes inveteratus – type locality for species • †Exitelus – type locality for genus • †Exitelus exsanguis – type locality for species • †Exochilum • †Exochilum inusitatum – type locality for species • †Exochus • †Exochus captus – type locality for species • †Exostinus – type locality for genus • †Exostinus serratus – type locality for species ==F==

• †Fagopsis • †Fagopsis longifolia • Falcipennis • †Falcipennis canadenis • Falco • , or American kestrel †Falco sparverius'' • †Fenusa – type locality for genus • †Fenusa parvus – type locality for species • †Fenusa primula – type locality for species • †Fibla • †Fibla exusta – type locality for species • Ficus • †Ficus affinis • †Ficus artocarpoides • †Ficus bruesi • †Ficus florissantella • †Ficus florissantia • †Ficus minutidens • †Ficus planicostata • †Ficus subtruncata • †Ficus uncata • †Figites • †Figites solus – type locality for species • †Florimena – type locality for genus • †Florimena impressa – type locality for species • †Floriscolia – type locality for genus • †Floriscolia relicta – type locality for species • †Florissantia (planthopper) – type locality for genus • †Florissantia elegans – type locality for species • sp. fossil flower †Florissantia (plant)'' – type locality for genus • †Florissantia speirii • †Florissantinus – type locality for genus • †Florissantinus angulatus – type locality for species • †Florissantoraphidia • †Florissantoraphidia funerata – type locality for species • †Florissantoraphidia mortua – type locality for species • > Formica • †Formica cockerelli – type locality for species • †Formica grandis – type locality for species • †Formica neorufibarbis • †Formica robusta – type locality for species • †Fornax • †Fornax relictus – type locality for species • †Frangulops – type locality for genus • †Frangulops pseudostenophylla – type locality for species. Formerly known as Ilex pseudostenophylla. • †Franimys – tentative report • †Fraxinus • †Fraxinus eocenica • Fulgora • †Fulgora obticescens – type locality for species • Fulica • , or American coot Fulica americana'' • †Fuscus – tentative report • †Fuscus faecatus – type locality for species ==G==

• †Galesimorpha • †Galesimorpha wheeleri – type locality for species • †Gastrallanobium – type locality for genus • †Gastrallanobium subconfusum – type locality for species • †Gaurotes • †Gaurotes striatopunctatus – type locality for species • †Gelastops • †Gelastops parcus • †Geocoris • †Geocoris infernorum – type locality for species • Geodromicus • †Geodromicus abditus – type locality for species • Geomys • , or Plains pocket gopher †Geomys bursarius'' • †Geotiphia – type locality for genus • †Geotiphia foxiana – type locality for species • †Geotiphia halictina – type locality for species • †Geotiphia pachysoma – type locality for species • †Geotiphia sternbergi – type locality for species • †Geralophus • †Geralophus antiquarius • †Geralophus discessus – type locality for species • †Geralophus fossicius • †Geralophus lassatus • †Geralophus occultus • †Geralophus pumiceus – type locality for species • †Geralophus repositus • †Geralophus retritus – type locality for species • †Geralophus saxuosus – type locality for species • †Geralophus scudderi – type locality for species • †Geranchon – type locality for genus • †Geranchon davisii – type locality for species • †Geron – tentative report • †Geron platysoma – type locality for species • †Geroncolabis • †Geroncolabis commixta – type locality for species • †Geroncolabis tertiaria – type locality for species • Gerris • †Gerris protobates – type locality for species • †Gigantocamelus'' • †Glossina – type locality for genus • †Glossina oligocenus – type locality for species • †Glossina osborni – type locality for species • †Glypta • †Glypta aurora – type locality for species • †Glyptosaurus • †Glyptosaurus sylvestris • †Glyptostrobu • †Glyptostrobu nordenskioldi • Glyptostrobus • †Glyptostrobus nordenskioldi • †Gnathium • †Gnathium aetatis – type locality for species • Gnophomyia • †Gnophomyia seiverti – type locality for species • †Gomphocerus • †Gomphocerus abstrusus – type locality for species • †Gomphotherium'' • †Gomphotherium obscurum • †Gonodera • †Gonodera antiqua – type locality for species • †Gonodera vulcanica – type locality for species • †Gorytes • †Gorytes archoryctes – type locality for species • †Grammoptera • †Grammoptera nanella – type locality for species • †Gregorymys • †Gregorymys larsoni • †Gryllacris • †Gryllacris cineris – type locality for species • †Gryllacris mutilata – type locality for species • †Gyaclavator'' – type locality for genus • †Gyaclavator kohlsi – type locality for species • †Gymnetron • †Gymnetron antecurrens – type locality for species • †Gymnopternus • †Gymnopternus lacustris – type locality for species • †Gymnorhinus • †Gymnorhinus cyanocephatus • †Gypona • †Gypona cinercia – type locality for species • †Gyrophaena • †Gyrophaena saxicola – type locality for species ==H==

• †Hadrianus • †Hadrianus corsoni • †Hadronema • †Hadronema cinerescens – type locality for species • Halesia • †Halesia reticulata • †Hammapteryx • †Hammapteryx ceryniiformis – type locality for species • †Hammapteryx lepidoides – type locality for species • †Hammapteryx tripunctata – type locality for species • (below) †Hapalodectes'' • †Hapalodectes leptognathus – or unidentified comparable form • †Haplaletes • †Haplaletes pelicatus • †Haploconus • †Haploconus entoconus – or unidentified comparable form • †Haplolambda • †Haplolambda quinni • †Haplomylus • †Haplomylus simpsoni • †Haplomylus speirianus • Harpalus • †Harpalus maceratus – type locality for species • †Harpalus nuperus – type locality for species • †Harpalus redivivus – type locality for species • †Harpalus ulomaeformis – type locality for species • †Harpalus veterum – type locality for species • †Harpalus whitfieldii • †Harrymys • †Heeria – type locality for genus • †Heeria foeda – type locality for species • †Heeria gulosa – type locality for species • †Heeria lapidosa – type locality for species • †Helaletes • †Helaletes nanus – or unidentified comparable form • †Helichus • †Helichus eruptus – type locality for species • †Helichus tenuior – type locality for species • †Heliscomys • †Heliscomys vetus • †Hellwigia • †Hellwigia obsoleta – type locality for species • Helophorus • †Helophorus auricollis • †Helophorus eclectus • †Hemiacodon • relative Hemiauchenia †Hemiauchenia • †Hemiauchenia macrocephala • †Hemiteles • †Hemiteles lapidescens – type locality for species • †Hemiteles obtectus – type locality for species • †Hemiteles priscus – type locality for species • †Hemiteles veternus – type locality for species • †Heptacodon • †Heptodon • †Heptodon calciculus • †Heptodon posticus • †Heriades • †Heriades bowditchi – type locality for species • †Heriades halictinus – type locality for species • †Heriades laminarum – type locality for species • †Heriades mersatus – type locality for species • †Heriades mildredae – type locality for species • †Heriades priscus – type locality for species • †Heriades saxosus – type locality for species • †Herpetotherium • †Herpetotherium fugax • †Herpetotherium innominatum • †Herpetotherium knighti • Hersiliola • †Hesperagrion • †Hesperagrion praevolans – type locality for species • †Hesperhys • . Robert Bruce Horsfall (1913). †Hesperocyon'' • †Hesperocyon coloradensis • †Hesperocyon gregarius • †Hesperolagomys • Heterodon • †Heterodon nasicus • †Heteromyza • †Heteromyza detecta – type locality for species • †Heteromyza miocenica – type locality for species • †Heterothops • †Heterothops conticens – type locality for species • †Hexacodus • †Hexacodus pelodes • †Hexerites – type locality for genus • †Hexerites primalis – type locality for species • fungus growing among moss †Heyderia'' • †Heyderia coloradensis – type locality for species • †Hiatensor • †Hiatensor semirutus – type locality for species • †Hipporhinops – type locality for genus • †Hipporhinops sternbergi – type locality for species • †Hirmoneura – type locality for genus • †Hirmoneura willistoni – type locality for species • Holbrookia • †Holbrookia maculata • †Holcorpa – type locality for genus • †Holcorpa maculosa – type locality for species • †Homoeogamia • †Homoeogamia ventriosa – type locality for species • †Homogalax'' • †Homogalax protapirinus • †Hoplia • †Hoplia striatipennis – type locality for species • †Hoplisidia – type locality for genus • †Hoplisidia kohliana – type locality for species • †Hoplocampa • †Hoplocampa ilicis – type locality for species • †Hoplochelys • †Hoplochelys crassa • †Horistonotus • †Horistonotus coloradensis – type locality for species • †Hormorus • †Hormorus saxorum – type locality for species • †Humulus • †Humulus florissantellus • †Hyaenodon'' • †Hyaenodon crucians • †Hyaenodon horridus • †Hyaenodon mustelinus • †Hydnobius • †Hydnobius tibialis – type locality for species • Hydraena • †Hydraena circulata – or unidentified comparable form • Hydrangea • †Hydrangea antica • †Hydrangea fraxinifolia • Hydriomena – tentative report • †Hydriomena? protrita – type locality for species • Hydrobius • water scavenger beetle †Hydrobius fuscipes'' • †Hydrobius maceratus – type locality for species • †Hydrobius prisconatator – type locality for species • †Hydrobius titan – type locality for species • †Hydromystria • †Hydromystria expansa • Hydrophilus • †Hydrophilus extricatus – type locality for species • Hydroporus • †Hydroporus sedimentorum – type locality for species • Hydropsyche • †Hydropsyche marcens – type locality for species • †Hydropsyche operta – type locality for species • †Hydropsyche scudderi – type locality for species • †Hydroptila • †Hydroptila phileos – type locality for species • predaceous diving beetle Hygrotus'' • †Hygrotus miocenus – type locality for species • Hylastes • †Hylastes americanus – type locality for species • †Hylastes nigrinus • †Hylesinus – type locality for genus • †Hylesinus dormiscens – type locality for species • †Hylesinus extractus – type locality for species • †Hylesinus hydropicus – type locality for species • †Hylobius • †Hylobius lacoei – type locality for species • †Hylomeryx • Hylurgops • †Hylurgops piger – type locality for species • †Hymenophyllum • †Hymenophyllum confusum • †Hymenorus • †Hymenorus haydeni – type locality for species • †Hyopsodus'' • †Hyopsodus loomisi • †Hyopsodus lysitensis • †Hyopsodus paulus • †Hyopsodus powellianus • †Hyopsodus simplex • †Hyopsodus walcottianus • †Hyopsodus wortmani • †Hypertragulus • †Hypertragulus calcaratus • †Hypisodus • †Hypisodus minimus • Hypnum • †Hypnum coloradense • †Hypnum haydenii • †Hypohippus • †Hypohippus osborni – type locality for species • †Hypolagus • †Hyporhina • †Hyporhina galbreathi – type locality for species • †Hyposodus • †Hyposodus loomisi • †Hyrachyus • †Hyrachyus modestus • . Charles R. Knight (1896). †Hyracodon'' • †Hyracodon arcidens – type locality for species • †Hyracodon leidyanus • †Hyracodon nebraskensis • †Hyracotherium • †Hyracotherium vasacciense • †Hystricops ==I==

• †Ichneumon • †Ichneumon alpha – type locality for species • †Ichneumon concretus – type locality for species • †Ichneumon decrepitus – type locality for species • †Ichneumon dormitans – type locality for species • †Ichneumon exesus – type locality for species • †Ichneumon obduratus – type locality for species • †Ichneumon petrinus – type locality for species • †Ichneumon pollens – type locality for species • †Ichneumon primigenius – type locality for species • †Ichneumon provectus – type locality for species • †Ichneumon somniatus – type locality for species • †Ichneumon torpefactus – type locality for species • †Ignacius • †Ignacius frugivorus • , or holly Ilex'' • †Ilex artocarpidioides • †Ilex knightiaefolia • †Ilex pseudostenophylla – type locality for species. Later reclassified in the new genus Frangulops. • †Indusia • †Indusia cypridis – type locality for species • †Iridomyrmex • †Iridomyrmex florissantius – type locality for species • †Iridomyrmex obscurans – type locality for species • Ischnoptera • †Ischnoptera brunneri – type locality for species • †Ischyromys'' • †Ischyromys douglassi – or unidentified comparable form • †Ischyromys typus • †Ischyromys veterior – or unidentified comparable form • †Isectolophus • †Isectolophus annectens • †Isoetites • †Isoetites horridus • †Isomira • †Isomira aurora – type locality for species • †Isomira florissantensis – type locality for species • †Isothea – type locality for genus • †Isothea alleni – type locality for species • †Isotrilophus • †Isotrilophus rasnitsyni – type locality for species • †Iulus • †Iulus florissantellus – type locality for species ==J==

• †Jadera • †Jadera interita – type locality for species • †Janus • †Janus disperditus – type locality for species • †Jassopsis – type locality for genus • †Jassopsis evidens – type locality for species • Jassus – tentative report. Lapsus calami of Iassus. • †"Jassus" latebrae – type locality for species • †Judolia • †Judolia antecurrens – type locality for species • , or walnut tree Juglans'' • †Juglans berryana • Junco • †Junco hyemalis • †Juncus • †Juncus crassulus • †Jungermanniopsis • †Jungermanniopsis cockerellii • †Jupitellia – type locality for genus • †Jupitellia charon – type locality for species ==K==

• shrub †Kalmia'' • †Kalmia elliptica • †Kimbetohia • †Kimbetohia mziae – type locality for species • †Knightomys • †Knightomys depressus • †Knightomys huerfanensis • Koelreuteria • †Koelreuteria alleni • †Kohlsimyrma – type locality for genus • †Kohlsimyrma gracilis – type locality for species • †Kohlsimyrma laticeps – type locality for species • †Kohlsimyrma longiceps – type locality for species • †Kronolictus – type locality for genus • †Kronolictus scudderiellus – type locality for species • †Kronolictus vulcanus – type locality for species ==L==

• †Laasbium – type locality for genus • †Laasbium agassizii – type locality for species • †Laasbium sectile – type locality for species • †Labandeiraia – type locality for genus • †Labandeiraia americaborealis – type locality for species • †Labidolemur • †Labidolemur kayi • †Labidolemur serus • †Labidolemur soricoides – type locality for species • †Labiduromma • †Labiduromma avia – type locality for species • †Labiduromma bormansi – type locality for species • †Laccopygus – type locality for genus • †Laccopygus nilesii – type locality for species • †Lachnopus • †Lachnopus humatus – type locality for species • †Lachnopus recuperatus – type locality for species • †Lacon • †Lacon exhumatus – type locality for species • , or white-tailed ptarmigan, in full summer plumage †Lagopus'' • †Lagopus leucurus • †Lambdotherium • †Lambdotherium popoagicum – type locality for species • †Lampronota • †Lampronota pristina – type locality for species • †Lampronota stygialis – type locality for species • †Lampronota tenebrosa – type locality for species • †Lapton • †Lapton daemon – type locality for species • Larus • †Lasiopa • †Lasiopa carpenteri – type locality for species • Lasiopodomys • †Lasiopodomys deceitensis • Lasius • †Lasius peritulus – type locality for species • †Lastrea • †Lastrea goldiana • Lathrobium • †Lathrobium antediluvianum – type locality for species • †Laurophyllum • †Laurophyllum caudatum • †Laurophyllum perseanum • , or laurel trees Laurus'' • †Laurus socialis • †Lebia • †Lebia protospiloptera – type locality for species • †Leguminosites • †Leguminosites coloradensis • †Leguminosites lespedezoides – type locality for species • †Leguminosites lesquereuxiana • †Leia • †Leia miocenica – type locality for species • †Lema • †Lema evanescens – type locality for species • †Lema fortior – type locality for species • †Lema lesquereuxi – type locality for species • Lemmiscus • †Lemmiscus curtatus • †Lepismophlebia • †Lepismophlebia platymera – type locality for species • , or gar Lepisosteus'' • †Leptacinus • †Leptacinus exsucidus – type locality for species • †Leptacinus fossus – type locality for species • †Leptacinus leidyi – type locality for species • †Leptacinus maclurei – type locality for species • †Leptacinus rigatus – type locality for species • †Leptacodon • †Leptacodon tener – type locality for species • †Leptarctus • †Leptarctus primus • †Leptauchenia • †Leptauchenia decora • †Leptauchenia major • †Leptis • †Leptis mystaceaeformis – type locality for species • †Leptobatopsis • †Leptobatopsis ashmeadii – type locality for species • †Leptobrochus – type locality for genus • †Leptobrochus luteus – type locality for species • †Leptochoerus • †Leptochoerus spectabilis • †Leptocyon'' • †Leptocyon vafer • †Leptogaster • †Leptogaster prior – type locality for species • †Leptomeryx • †Leptomeryx esulcatus • †Leptomeryx evansi • †Leptomeryx speciosus • †Leptomorphus • †Leptomorphus palaeospilus – type locality for species • Leptophloeus • †Leptophloeus alternans – or unidentified comparable form • †Leptostylus • †Leptostylus scudderi – type locality for species • †Leptotomus • †Leptotomus parvus • †Leptura • †Leptura petrorum – type locality for species • †Leptura ponderosissima – type locality for species • †Leptura wickhami – type locality for species • Lepus • , or white-tailed jackrabbit †Lepus townsendii'' • †Lestomyia • †Lestomyia miocenica – type locality for species • †Leucosticte • †Leucosticte atrata • †Leucosticte tephrocotis • †Leucozona • †Leucozona nigra – type locality for species • †Libellulapis – type locality for genus • †Libellulapis antiquorum – type locality for species • †Libellulapis wilmattae – type locality for species • †Lichnanthe • †Lichnanthe defuncta – type locality for species • †Ligyrocoris • †Ligyrocoris exsuctus – type locality for species • †Ligyrus • †Ligyrus compositus – type locality for species • †Ligyrus effetus – type locality for species • caddisfly †Limnephilus'' • †Limnephilus eocenicus – type locality for species • †Limnerium • †Limnerium consuetum – type locality for species • †Limnerium depositum – type locality for species • †Limnerium plenum – type locality for species • †Limnerium tectum – type locality for species • †Limnerium vetustum – type locality for species • †Limnobium • †Limnobium obliteratum • †Limnocema • †Limnocema lutescens – type locality for species • †Limnocema marcescens – type locality for species • †Limnocema mortoni – type locality for species • †Limnocema sternbergi – type locality for species • †Limnocema styx – type locality for species • †Limnoecus • †Limnoecus compressus • †Limnophila • †Limnophila rogersii – type locality for species • †Limnophila vasta – type locality for species • †Limnophilus • †Limnophilus soporatus – type locality for species • †Limnopsyche – type locality for genus • †Limnopsyche dispersa – type locality for species • †Limonius • †Limonius aboriginalis – type locality for species • †Limonius florissantensis – type locality for species • †Limonius praecursor – type locality for species • †Limonius shoshonis – type locality for species • †Limonius volans – type locality for species • Lindera • †Lindera coloradica – type locality for species • †Lindera obtusata • †Lindera varifolia – type locality for species • †Linnaea'' – type locality for genus • †Linnaea abolita – type locality for species • †Linnaea carcerata – type locality for species • †Linnaea evoluta – type locality for species • †Linnaea gravida – type locality for species • †Linnaea holmesii – type locality for species • †Linnaea putnami – type locality for species • †Linyphia • †Linyphia byrami – type locality for species • †Linyphia florissanti – type locality for species • †Linyphia pachygnathoides – type locality for species • †Linyphia retensa – type locality for species • †Linyphia seclusa – type locality for species • ant †Liometopum'' • †Liometopum miocenicum – type locality for species • †Liometopum scudderi – type locality for species • †Listrochelus • †Listrochelus puerilis – type locality for species • †Listroderes • †Listroderes differens – type locality for species • †Listroderes evisceratus – type locality for species • †Lithagrion • †Lithagrion hyalinum – type locality for species • †Lithandrena – type locality for genus • †Lithandrena saxorum – type locality for species • †Lithanthidium – type locality for genus • †Lithanthidium pertriste – type locality for species • †Lithecphora – type locality for genus • †Lithecphora diaphana – type locality for species • †Lithecphora murata – type locality for species • †Lithecphora setigera – type locality for species • †Lithecphora unicolor – type locality for species • †Lithembia • †Lithembia florissantensis – type locality for species • †Litheuphaea • †Litheuphaea coloradensis – type locality for species • †Lithocharis • †Lithocharis scottii – type locality for species • †Lithochromus – type locality for genus • †Lithochromus extraneus – type locality for species • †Lithochromus gardneri – type locality for species • †Lithochromus mortuarius – type locality for species • †Lithochromus obstrictus – type locality for species • †Lithocicada – type locality for genus • †Lithocicada perita – type locality for species • †Lithocoris – type locality for genus • †Lithocoris evulsus – type locality for species • †Lithocoryne – type locality for genus • †Lithocoryne arcuata – type locality for species • †Lithocoryne coloradensis – type locality for species • †Lithocoryne gravis – type locality for species • †Lithodryas'' – type locality for genus • †Lithodryas styx – type locality for species • †Lithogryllites • †Lithogryllites lutzii – type locality for species • †Litholabis • †Litholabis gilberti – type locality for species • †Lithomacratria – type locality for genus • †Lithomacratria mirabilis – type locality for species • †Lithomyza – type locality for genus • †Lithomyza condita – type locality for species • †Lithophotina – type locality for genus • †Lithophotina costalis – type locality for species • †Lithophotina floccosa – type locality for species • †Lithophthorus – type locality for genus • †Lithophthorus rugosicollis – type locality for species • †Lithopsis • †Lithopsis delicata – type locality for species • †Lithopsis dubiosa – type locality for species • †Lithopsis fimbriata – or unidentified comparable form • †Lithopsis simillima – type locality for species • †Lithoserix – type locality for genus • †Lithoserix williamsi – type locality for species • †Lithosmylus • †Lithosmylus columbianus – type locality for species • †Lithotiphia – type locality for genus • †Lithotiphia scudderi – type locality for species • †Lithymnetes – type locality for genus • †Lithymnetes guttatus – type locality for species • †Litobrochus – type locality for genus • †Litobrochus externatus – type locality for species • †Litomylus • †Litomylus ishami • †Locrites – type locality for genus • †Locrites copei – type locality for species • †Locrites whitei – type locality for species • †Locusta • †Locusta silens – type locality for species • Lomatia • †Lomatites • †Lomatites spinosa • Longitarsus • Lontra • , or North American river otter †Lontra canadensis'' – or unidentified comparable form • †Lophiparamys • †Lophiparamys debequensis • Lordithon • †Lordithon durabilis – type locality for species • †Lordithon funditus – type locality for species • †Lordithon longiceps • †Lordithon lyelli – type locality for species • †Lordithon stygis – type locality for species • †Loveina • †Loveina zephyri • †Lowesaurus • †Lowesaurus matthewi – type locality for species • †Loxolophus • †Loxolophus hyattianus • †Lucanus • †Lucanus fossilis – type locality for species • †Lucidota • †Lucidota prima – type locality for species • †Ludiophanes – type locality for genus • †Ludiophanes haydeni – type locality for species • †Ludius • †Ludius exanimatus – type locality for species • †Ludius granulicollis – type locality for species • †Ludius heeri – type locality for species • †Ludius laevissimus – type locality for species • †Ludius primitivus – type locality for species • †Ludius propheticus – type locality for species • †Ludius restructus – type locality for species • †Ludius submersus – type locality for species • †Luperodes • †Luperodes submonilis – type locality for species • †Lutrochites – type locality for genus • †Lutrochites lecontei – type locality for species • wolf spider †Lycosa'' • †Lycosa florissanti – type locality for species • †Lygaeus • †Lygaeus faeculentus – type locality for species • †Lygaeus obsolescens – type locality for species • †Lygaeus stabilitus – type locality for species • Lygodium • †Lygodium coloradense • †Lygodium kaulfussi • Lynx • †Lynx rufus • Lytta • †Lytta lithophila – type locality for species ==M==

• †Macratria • †Macratria gigantea – type locality for species • Macrocranion'' • †Macrocranion nitens • †Macrodactylus • †Macrodactylus pluto – type locality for species • †Macrodactylus propheticus – type locality for species • †Macrophya • †Macrophya pervetusta – type locality for species • †Macrorhoptus • †Macrorhoptus intutus – type locality for species • Magdalis • †Magdalis lecontei • †Magdalis sedimentorum – type locality for species • flower Magnolia'' • †Magnolia berryi • †Magnolia magnifolia • †Magnolia regalis • †Magnolia rotundifolia • Mahonia • †Mahonia marginata • †Mahonia obliqua – type locality for species • †Mahonia subdenticulata • †Maiorana • †Malachius • †Malachius immurus – type locality for species • †Malus • †Malus florissantensis • †Malus pseudocredneria • †Mammuthus • , or Columbian mammoths. The extent of the fur depicted is hypothetical. Charles R. Knight (1909). †Mammuthus columbi'' • †Manapsis – type locality for genus • †Manapsis anomala – type locality for species • Marmota • †Marmota flaviventris • †Marquettia • †Marquettia americana – type locality for species • Marsilea • †Marsilea sprungerorum • Martes • †Masteutes • †Masteutes rupis – type locality for species • †Masteutes saxifer – type locality for species • †Mataeoschistus – type locality for genus • †Mataeoschistus limigenus – type locality for species • †Matthewlabis • †Matthewlabis cedrensis • †Mattimys • †Mecistoneuron – type locality for genus • †Mecistoneuron perpetuum – type locality for species • Mecocephala • †Megacerops'' • †Megacerops kuwagatarhinus • Megachile • †Megachile praedicta – type locality for species • †Megacyllene • †Megacyllene florissantensis – type locality for species • †Megadelphus • †Megadelphus lundeliusi • †Megahippus • †Megalagus • †Megalagus brachydon • †Megalagus brachyodon • †Megalagus turgidus • †Megalesthonyx • †Megalictis • †Megapenthes • †Megapenthes primaevus – type locality for species • †Megaraphidia – type locality for genus • †Megaraphidia elegans – type locality for species • †Megaraphidia exhumata – type locality for species • †Megatryphon – type locality for genus • †Megatryphon mortiferus – type locality for species • †Megatylopus • †Megatylopus gigas – or unidentified comparable form • †Megaxyela • †Megaxyela petrefacta – type locality for species • †Melanactes • †Melanactes cockerelli – type locality for species • †Melanagrion • †Melanagrion nigerrimum – type locality for species • †Melanagrion umbratum – type locality for species • †Melanagromyza • †Melanagromyza prisca – type locality for species • †Melanagromyza tephrias – type locality for species • †Melanderella • †Melanderella glossalis – type locality for species • †Melanophila • †Melanophila cockerellae – type locality for species • †Melanophila handlirschi – type locality for species • †Melanophila heeri – type locality for species • Melanthrips • †Melanthrips extincta – type locality for species • †Melieria • †Melieria atavina – type locality for species • †Melieria calligrapha – type locality for species • †Melittomma • †Melittomma lacustrinum – type locality for species • †Mellinus • †Mellinus handlirschi – type locality for species • Melospiza • †Melospiza lincolnii • †Meniscotherium • †Meniscotherium chamense • †Meniscotherium tapiacitum • †Menoceras'' • †Menoceras barbouri • Mephitis • †Mephitis mephitis • †Meracantha • †Meracantha lacustris – type locality for species • †Merychippus • †Merychippus coloradense • †Merychippus sejunctus • †Merychyus • †Merychyus arenarum • †Merychyus elegans – type locality for species • †Merycochoerus • †Merycochoerus magnus • †Merycochoerus matthewi • †Merycodus • †Merycodus warreni • †Merycoidodon – type locality for genus • †Merycoidodon culbertsoni – type locality for species • †Merycoidodon major • †Mesatirhinus • †Mesatirhinus junius • †Mesobrochus – type locality for genus • †Mesobrochus imbecillus – type locality for species • †Mesobrochus lethaeus – type locality for species • †Mesochorus • †Mesochorus abolitus – type locality for species • †Mesochorus aboriginalis – type locality for species • †Mesochorus carceratus – type locality for species • †Mesochorus cataclysmi – type locality for species • †Mesochorus dormitorius – type locality for species • †Mesochorus lapideus – type locality for species • †Mesochorus revocatus – type locality for species • †Mesochorus terrosus – type locality for species • †Mesocyon'' • †Mesocyon temnodon • †Mesodma • †Mesodma ambigua • †Mesodma hensleighi • †Mesogaulus • †Mesogaulus paniensis • †Mesohippus • †Mesohippus bairdi • †Mesoleptus • †Mesoleptus apertus – type locality for species • †Mesoleptus exstirpatus – type locality for species • †Mesoneura • †Mesoneura vexabilis – type locality for species • †Mesonyx'' • †Mesonyx obtusidens • †Mesopimpla – type locality for genus • †Mesopimpla sequoiarum – type locality for species • †Mesostenus • †Mesostenus modestus – type locality for species • Messor • †Messor sculpturatus – type locality for species • †Metacheiromys • Metachroma • †Metachroma florissantensis – type locality for species • †Metarhinus • Metasequoia • †Metasequoia occidentalis • †Metechinus • †Metechinus amplior • †Metoecus • †Metoecus geikiei – type locality for species • †Metrobates • †Metrobates aeternalis – type locality for species • †Miacis'' • †Miacis edax • †Miacis exiguus • †Miacis latidens • †Miacis parvivorus • †Miacis vorax • Miagrammopes • †Mianeuretus – type locality for genus • †Mianeuretus eocenicus – type locality for species • †Mianeuretus mirabilis – type locality for species • †Michenia • †Microgaster • †Microgaster primordialis – type locality for species • †Microplitis • †Microplitis vesperus – type locality for species • †Microrhagus • †Microrhagus fossilis – type locality for species • †Microrhagus miocenicus – type locality for species • †Microrhagus vulcanicus – type locality for species • †Microstylum • †Microstylum destructum – type locality for species • †Microstylum wheeleri – type locality for species • †Microsyops • †Microsyops angustidens • †Microsyops annectens • †Microsyops elegans • †Microsyops knightensis • †Microsyops latidens • †Microsyops scottianus • †Microtomarctus • †Microtomarctus conferta • Microtus • , or California vole †Microtus californicus'' – or unidentified comparable form • †Microtus longicaudus • †Microtus meadensis • †Microtus ochrogaster • †Microtus paroperarius • Mictomys • †Mictomys meltoni • †Mictomys vetus • †Mimomys • †Mimomys virginianus • †Mimoperadectes • †Mimoperadectes labrus • †Mimosites • †Mimosites coloradensis • †Mimotricentes • †Mimotricentes ischyrus – type locality for species • †Mindarus – type locality for genus • †Mindarus recurvus – type locality for species • †Mindarus scudderi – type locality for species • †Miniochoerus'' • †Miniochoerus gracilis • †Miocaenia – type locality for genus • †Miocaenia pectinicornis – type locality for species • †Miocitta – type locality for genus • †Miocitta galbreathi – type locality for species • †Miocoris – type locality for genus • †Miocoris fagi – type locality for species • †Miocyphon – type locality for genus • †Miocyphon punctulatus – type locality for species • †Miodytiscus – type locality for genus • †Miodytiscus hirtipes – type locality for species • †Miogeraeus – type locality for genus • †Miogeraeus recurrens – type locality for species • †Miohippus'' • †Miohippus obliquidens • †Miolabis • †Miolabis longiceps • †Miolachnosterna – type locality for genus • †Miolachnosterna tristoides – type locality for species • †Miolithocharis – type locality for genus • †Miolithocharis lithographica – type locality for species • †Miomyrmex • †Miomyrmex impactus – type locality for species • †Miomyrmex striatus – type locality for species • †Miophenolia – type locality for genus • †Miophenolia cilipes – type locality for species • †Miopodagrion • †Miopodagrion optimum – type locality for species • †Miosilpha – type locality for genus • †Miosilpha necrophiloides – type locality for species • †Miospermophilus • †Miospermophilus bryanti • †Miostenosis – type locality for genus • †Miostenosis lacordairei – type locality for species • , or American cheetah †Miracinonyx'' • †Miracinonyx inexpectatus – or unidentified comparable form • †Miracinonyx studeri • †Mischoserphus • †Mischoserphus bruesi – type locality for species • †Mitostylus • †Mitostylus abacus – type locality for species • †Mitostylus obdurefactus – type locality for species • †Monocrepidius • †Monocrepidius dubiosus – type locality for species • †Monophlebus • †Monophlebus simplex – type locality for species • †Monosaulax • †Monosaulax curtus • Mordella • †Mordella atrata – or unidentified comparable form • †Mordella lapidicola – type locality for species • †Mordella priscula – type locality for species • †Mordella stygia – type locality for species • Mordellistena • †Mordellistena florissantensis – type locality for species • †Mordellistena nearctica – type locality for species • †Mordellistena protogaea – type locality for species • †Mordellistena scudderiana – type locality for species • †Mordellistena smithiana – type locality for species • †Moropus • †Moropus elatus – or unidentified comparable form • Morus • †Morus symmetrica • †Moyamyia – type locality for genus • †Moyamyia limigena – type locality for species • Musca • †Musca vinculata – type locality for species • Mustela • †Mustela richardsonii • †Mustela nigripes • †Myas • †Myas rigefactus – type locality for species • †Myas umbrarum – type locality for species • †Mycetaulus • †Mycetaulus incretus – type locality for species • †Mycetophagus • †Mycetophagus exterminatus – type locality for species • †Mycetophagus willistoni – type locality for species • †Mycetophila • †Mycetophila bradenae – type locality for species • †Mycetophila occultata – type locality for species • Mycetoporus • †Mycetoporus demersus – type locality for species • †Mycomya • †Mycomya cockerelli – type locality for species • †Mycomya lithomendax – type locality for species • †Mydas • †Mydas miocenicus – type locality for species • , or firetree Myrica'' • †Myrica drymeja • †Myrmecites – type locality for genus • †Myrmecites rotundiceps – type locality for species • Myrmica • †Myrmica lobifrons • †Myrtophyllum • †Myrtophyllum torreyi • †Mystipterus • †Mystipterus martini • †Mytonomys • †Mytonomys coloradensis ==N==

• †Najadopsis • †Najadopsis rugulosa • †Nannodectes • †Nannodectes gazini • †Nannodectes gidleyi • †Nannodectes simpsoni • †Nanodelphys • †Nanodelphys hunti • †Nanthacia • †Nanthacia torpida – type locality for species • †Navajovius • †Navajovius kohlhaasae – type locality for species • ground beetle Nebria'' • †Nebria occlusa – type locality for species • †Nebritus • †Nebritus willistoni – type locality for species • †Necrobia • †Necrobia divinatoria – type locality for species • †Necrobia sibylla – type locality for species • †Necrochromus – type locality for genus • †Necrochromus cockerelli – type locality for species • †Necrochromus labatus – type locality for species • †Necrochromus saxificus – type locality for species • †Necrocydnus – type locality for genus • †Necrocydnus amyzonus – type locality for species • †Necrocydnus revectus – type locality for species • †Necrocydnus senior – type locality for species • †Necrocydnus solidatus – type locality for species • †Necrocydnus stygius – type locality for species • †Necrocydnus torpens – type locality for species • †Necrocydnus vulcanius – type locality for species • †Necrodes • †Necrodes primaevus – type locality for species • †Necropsylla – type locality for genus • †Necropsylla rigida – type locality for species • †Necropsylla rigidula – type locality for species • †Nelumbium • †Nelumbium tenuifolium • †Nemognatha • †Nemognatha exsecta – type locality for species • Neohypnus • Neogale • †Neogale frenata • †Neogale vison • †Neoliotomus • †Neoliotomus conventus • †Neoliotomus ultimus • Neoptochus – tentative report • †Neorhynchocephalus • †Neorhynchocephalus melanderi – type locality for species • †Neorhynchocephalus occultator – type locality for species • †Neorhynchocephalus vulcanicus – type locality for species • Neotoma • †Neotoma cinerea • †Neotoma ozarkensis • †Nepa • †Nepa vulcanica – type locality for species • , or golden silk orb-weaver †Nephila'' • †Nephila pennatipes – type locality for species • †Netelia • †Netelia memorialis – type locality for species • †Neurodromicus – type locality for genus • †Neurodromicus dorsalis – type locality for species • †Nicocles • †Nicocles miocenicus – type locality for species • †Niptomomys • †Niptomomys doreenae – type locality for species • Nitidotachinus • †Nitidotachinus lanei • Nitidula • †Nitidula prior – type locality for species • †Nordenskioldia • †Nordenskioldia borealis • †Nortonella – type locality for genus • †Nortonella typica – type locality for species • †Nosotetocus – type locality for genus • †Nosotetocus debilis – type locality for species • †Nosotetocus marcovi – type locality for species • †Nosotetocus vespertinus – type locality for species • †Notharctus'' • †Notharctus robinsoni • †Notharctus robustior • †Nothopus • †Nothopus kingii – type locality for species • †Nothoserphus • †Nothoserphus rasnitsyni – type locality for species • Notonecta • †Notonecta binuda – type locality for species • †Notonecta emersoni – type locality for species • †Notoparamys • †Notoparamys arctios – type locality for species • †Notoparamys costilloi • Numenius • †Numenius madagascariensis • †Numitor – type locality for genus • †Numitor claviger – type locality for species • †Nyctea • †Nyctea scandiaca • †Nyctitherium • †Nyctitherium velox – or unidentified comparable form • †Nyktalos – type locality for genus • †Nyktalos uhleri – type locality for species • †Nyktalos vigil – type locality for species • Nymphaea'' • †Nymphaea leei • †Nymphaea pulchella • †Nymphalites – type locality for genus • †Nymphalites obscurus – type locality for species • †Nymphalites scudderi – type locality for species • Nysius • †Nysius stratus – type locality for species • †Nysius terrae – type locality for species • †Nysius tritus – type locality for species • †Nysius vecula – type locality for species • †Nysius vinctus – type locality for species • †Nyssa • †Nyssa alata • †Nyssa obovata ==O==

• Ochotona • †Ochotona princeps • †Ocymoromelitta – type locality for genus • †Ocymoromelitta florissantella – type locality for species • †Ocymoromelitta miocenica – type locality for species • †Ocymoromelitta sorella – type locality for species • †Odaxosaurus – or unidentified comparable form • †Odaxosaurus piger • Odocoileus • , or mule deer. †Odocoileus hemionus'' • †Odynerus • †Odynerus palaeophilus – type locality for species • †Odynerus percontusus – type locality for species • †Odynerus praesepultus – type locality for species • †Odynerus terryi – type locality for species • †Odynerus wilmattae – type locality for species • †Oedipoda • †Oedipoda praefocata – type locality for species • †Ogygoptynx – type locality for genus • †Ogygoptynx wetmorei – type locality for species • †Olbiogaster • †Olbiogaster simplex – type locality for species • †Oligaeschna • †Oligaeschna lapidaria – type locality for species • †Oligaeschna separata – type locality for species • †Oligoaeschna – type locality for genus • †Oligoaeschna needhami – type locality for species • †Oligobruchus • †Oligobruchus florissantensis – type locality for species • †Oligobruchus haywardi – type locality for species • †Oligobruchus primoticus – type locality for species • †Oligobruchus scudderi – type locality for species • †Oligobruchus submersus – type locality for species • †Oligobruchus wilsoni – type locality for species • †Oligocryptus – type locality for genus • †Oligocryptus sectus – type locality for species • †Oligodonta – type locality for genus • †Oligodonta florissantensis – type locality for species • death-watch beetle †Oligomerus'' • †Oligomerus breviusculus – type locality for species • †Oligomerus duratus – type locality for species • †Oligomerus florissantensis – type locality for species • †Oligomyotis • †Oligomyotis casementi • †Oligoneuroides – type locality for genus • †Oligoneuroides destructus – type locality for species • †Oligoryctes • †Oligoscalops • †Oligoscalops galbreathi • †Oligotricha • †Oligotricha evanescens – type locality for species • †Ologlyptus • †Ologlyptus primus – type locality for species • Olophrum • †Olophrum boreale • †Olophrum obtectum • Omalium • †Omalium antiquorum – type locality for species • †Omileus • †Omileus evanidus – type locality for species • †Omomys • †Omomys carteri • Omus • †Omus audouini • , or muskrat Ondatra'' • †Ondatra annectens • †Oodectes • †Oodectes herpestoides • Ophisaurus • Ophryastes • †Ophryastes championi • †Ophryastes grandis – type locality for species • †Ophryastes petrarum • †Ophryastites • †Ophryastites absconsus – type locality for species • †Ophryastites cinereus – type locality for species • †Ophryastites dispertitus – type locality for species • †Ophryastites hendersoni – type locality for species • †Ophryastites miocenus – type locality for species • †Ophyra • †Ophyra vetusta – type locality for species • †Opisthotriton • †Opisthotriton kayi – or unidentified comparable form • †Orchelimum • †Orchelimum placidum – type locality for species • Orchestes • †Orchestes languidulus – type locality for species • Oreamnos – or unidentified comparable form • '', or Harrington's mountain goat †Oreamnos harringtoni • †Oreolagus • †Oreolagus wilsoni – type locality for species • †Oreopanax • †Oreopanax dissecta • †Oreopanax elongatum – type locality for species • †Oreotalpa – type locality for genus • †Oreotalpa florissantensis – type locality for species • †Ormyrodes • †Ormyrodes petrefactus – type locality for species • †Orohippus • †Orohippus sylvaticus • †Oromeryx • , or golden-club †Orontium'' • †Orontium fossile • †Orphilus • †Orphilus dubius • †Orthocentrus • †Orthocentrus defossus – type locality for species • †Orthocentrus primus – type locality for species • †Orthriocorisa – type locality for genus • †Orthriocorisa longipes – type locality for species • †Oryctogma – type locality for genus • †Oryctogma sackenii – type locality for species • †Oryctorhinus – type locality for genus • †Oryctorhinus tenuirostris – type locality for species • †Oryctoscirtetes – type locality for genus • †Oryctoscirtetes protogaeum – type locality for species • †Osmanthus • †Osmanthus praemissa • ferns †Osmunda'' • †Osmunda greenlandica • †Osmylidia • †Osmylidia requieta – type locality for species • †Otiorhynchites • †Otiorhynchites absentivus – type locality for species • †Otiorhynchites commutatus – type locality for species • †Otiorhynchites florissantensis – type locality for species • †Otiorhynchites tysoni • †Otiorhynchus • †Otiorhynchus flaccus – type locality for species • †Otiorhynchus subteractus – type locality for species • Ovis • †Ovis canadensis • †Oxyacodon • †Oxyacodon archibaldi – type locality for species • †Oxyaena'' • †Oxyaena forcipata • †Oxyaena gulo • †Oxyaena intermedia • †Oxyaena lupina – or unidentified comparable form • †Oxyaena pardalis – or unidentified comparable form • †Oxycera • †Oxycera contusa – type locality for species • †Oxyclaenus • †Oxyclaenus cuspidatus – or unidentified comparable form • †Oxyclaenus subbituminus – type locality for species • †Oxygonus • †Oxygonus primus – type locality for species • †Oxyomus • †Oxyomus nearcticus – type locality for species • †Oxyprimus • †Oxyprimus galadrielae – or unidentified comparable form • †Oxyserphus • †Oxyserphus exhumatus – type locality for species • Oxytelus • †Oxytelus laqueatus • †Oxytelus pristinus – type locality for species • †Oxytelus subapterus – type locality for species ==P==

• †Pachyaena'' • †Pachyaena ossifraga – tentative report • †Pachybaris • †Pachybaris rudis – type locality for species • †Pachylobius • †Pachylobius compressus • †Pachylobius depraedatus – type locality for species • †Pachysomites – type locality for genus • †Pachysomites inermis – type locality for species • †Pachysystropus – type locality for genus • †Pachysystropus condemnatus – type locality for species • †Pachysystropus rohweri – type locality for species • †Pactopus • †Pactopus americanus – type locality for species • rove beetle †Paederus'' • †Paederus adumbratus – type locality for species • †Paladicella – type locality for genus • †Paladicella eruptionis – type locality for species • †Palaeictops • †Palaeictops bicuspis • †Palaeictops multicuspis • †Palaeobittacus – type locality for genus • †Palaeobittacus eocenicus – type locality for species • †Palaeochrysa – type locality for genus • †Palaeochrysa concinnula – type locality for species • †Palaeochrysa stricta – type locality for species • †Palaeochrysa wickhami – type locality for species • †Palaeocrex – type locality for genus • †Palaeocrex fax – type locality for species • †Palaeodrassus • †Palaeodrassus cockerelli – type locality for species • †Palaeodrassus florissanti – type locality for species • †Palaeodrassus hesternus • †Palaeodrassus interitus – type locality for species • †Palaeogale'' • †Palaeogale sectoria • †Palaeogyps – type locality for genus • †Palaeogyps prodromus – type locality for species • †Palaeolagus • †Palaeolagus burkei – type locality for species • †Palaeolagus haydeni • †Palaeolagus intermedius • †Palaeometa • †Palaeometa opertanea – type locality for species • †Palaeonanophyes – type locality for genus • †Palaeonanophyes zherikhini – type locality for species • †Palaeonictis'' • †Palaeonictis occidentalis • †Palaeopachygnatha – type locality for genus • †Palaeopachygnatha cockerelli – type locality for species • †Palaeopachygnatha scudderi – type locality for species • †Palaeopherocera • †Palaeopherocera scudderi – type locality for species • †Palaeoplatyura • †Palaeoplatyura eocenica – type locality for species • †Palaeopotamogeton • †Palaeopotamogeton florissanti • †Palaeorehnia – type locality for genus • †Palaeorehnia maculata – type locality for species • †Palaeoscincosaurus – type locality for genus • †Palaeoscincosaurus middletoni – type locality for species • †Palaeosinopa • †Palaeosinopa incerta • †Palaeosmodicum – type locality for genus • †Palaeosmodicum hamiltoni – type locality for species • †Palaeospiza • †Palaeospiza bella • †Palaeosyops'' – type locality for genus • †Palaeosyops fontinalis – type locality for species • †Palaeotaxonus – type locality for genus • †Palaeotaxonus trivittatus – type locality for species • †Palaeotaxonus typicus – type locality for species • †Palaeotaxonus vetus – type locality for species • †Palaeoteleia – type locality for genus • †Palaeoteleia oxyura – type locality for species • †Palaeotorymus • †Palaeotorymus aciculatus – type locality for species • †Palaeotorymus laevis – type locality for species • †Palaeotorymus striatus – type locality for species • †Palaeotorymus typicus – type locality for species • †Palaeovelia – type locality for genus • †Palaeovelia spinosa – type locality for species • †Palaeovespa'' – type locality for genus • †Palaeovespa florissantia – type locality for species • †Palaeovespa gillettei – type locality for species • †Palaeovespa relecta – type locality for species • †Palaeovespa scudderi – type locality for species • †Palaeovespa wilsoni – type locality for species • †Palaphrodes – type locality for genus • †Palaphrodes cincta – type locality for species • †Palaphrodes irregularis – type locality for species • †Palaphrodes obliqua – type locality for species • †Palaphrodes obscura – type locality for species • †Palaphrodes transversa – type locality for species • †Palatobaena • †Palatobaena bairdi • †Palecphora – type locality for genus • †Palecphora communis – type locality for species • †Palecphora inornata – type locality for species • †Palecphora maculata – type locality for species • †Palecphora marvinei – type locality for species • †Palecphora praevalens – type locality for species • †Paleocarcinophora • †Paleocarcinophora lithophila – type locality for species • †Paleoclinolabus • †Paleoclinolabus dormitus – type locality for species • †Palmites • †Palmocarpon • †Palmocarpon commune • †Palmocarpon compositum • †Palmocarpon lineatum • †Palmocarpon subcylindricum • †Palmocarpon truncatum • †Paloedemera – type locality for genus • †Paloedemera crassipes – type locality for species • †Paloreodoxites • †Paloreodoxites plicatus • †Paltorhynchus • †Paltorhynchus bisulcatus – type locality for species • †Paltorhynchus depratus • †Paltorhynchus narwhal • †Paltorhynchus rectirostris – type locality for species • †Paltorhynchus sedatus – type locality for species • †Panax • †Panax andrewsii • †Pandeleteinus • †Pandeleteinus nudus – type locality for species • scorpionfly †Panorpa'' • †Panorpa arctiiformis – type locality for species • †Panorpa rigida – type locality for species • †Pantoclis • †Pantoclis deperdita – type locality for species • †Pantolestes • †Pantolestes natans • †Paracarpinus • †Paracarpinus fraterna • Paracosmus – type locality for genus • †Paracosmus antiquus – type locality for species • †Paracosmus coquilletti – type locality for species • †Paracosmus palpalis – type locality for species • †Paracosmus recurrens – type locality for species • †Paracosoryx • †Paracynarctus • †Paracynarctus kelloggi • †Paradjidaumo • †Paradjidaumo trilophus • †Paraglyptosaurus • †Paraglyptosaurus princeps – type locality for species • †Parahippus • †Parahippus leonensis – or unidentified comparable form • †Parahippus pawniensis – type locality for species • †Parajulus • †Parajulus cockerelli – type locality for species • Paramylodon †Paramylodon • †Paramylodon harlani • †Paramys • †Paramys copei • †Paramys excavatus • †Paramys relictus • †Paramys taurus • †Parandra • †Parandra florissantensis – type locality for species • †Parattus – type locality for genus • †Parattus evocatus – type locality for species • †Parattus latitatus – type locality for species • †Parattus oculatus – type locality for species • †Parattus resurrectus – type locality for species • †Paratylopus'' • †Paratylopus labiatus • †Parectypodus • †Parectypodus lunatus • †Parictis • †Parictis dakotensis • †Parodarmistus – type locality for genus • †Parodarmistus abscissus – type locality for species • †Parodarmistus caducus – type locality for species • †Parodarmistus collisus – type locality for species • †Parodarmistus defectus – type locality for species • †Parodarmistus exanimatus – type locality for species • †Parodarmistus inhibitus – type locality for species • †Parolamia – type locality for genus • †Parolamia rudis – type locality for species • †Parophisaurus – type locality for genus • †Parophisaurus pawneensis – type locality for species • †Parotermes – type locality for genus • †Parotermes insignis – type locality for species • †Parthenocissus • †Parthenocissus osbornii • †Parvericius • †Parvericius montanus • †Passaloecus • †Passaloecus fasciatus – type locality for species • †Passaloecus scudderi – type locality for species • . Charles R. Knight (1896). †Patriofelis • †Patriofelis ulta • †Paussopsis – type locality for genus • †Paussopsis nearctica – type locality for species • †Paussopsis secunda – type locality for species • Pediacus • †Pediacus periclitans – type locality for species • Pekania • †Pekania diluviana • †Pelandrena – type locality for genus • †Pelandrena reducta – type locality for species • †Pellea • †Pellea antiquella • †Peltis • †Peltis laminata – type locality for species • †Peltosaurus'' • †Peltosaurus granulosus – type locality for species • †Pelycodus • †Pelycodus danielsae • †Pelycodus jarrovii • †Pelycomys • †Pelycomys placidus • †Pelycomys rugosus • †Penetrigonias • †Penetrigonias dakotensis • †Penosphyllum • †Penosphyllum cordatum • †Pentatomites – type locality for genus • †Pentatomites foliarum – type locality for species • march fly Penthetria'' – type locality for genus • †Penthetria creedensis – type locality for species • †Penthetria immutabilis – type locality for species • †Penthetria intermedia – type locality for species • †Penthetria longifurca – type locality for species • †Pepsis • †Pepsis avitula – type locality for species • †Peraceras • †Peraceras profectum • †Peraceras superciliosum • †Peradectes • †Peradectes elegans – type locality for species • †Peradectes protinnominatus – type locality for species • †Peratherium'' • †Peratherium comstocki – or unidentified comparable form • †Perchoerus • †Perchoerus nanus • †Periptychus • †Periptychus coarctatus • Peromyscus • †Peromyscus cragini • †Peromyscus maniculatus • †Peromyscus progressus • Persea • †Persea brossiana • †Persea florissantia – type locality for species • †Petraeomyrmex'' – type locality for genus • †Petraeomyrmex minimus – type locality for species • †Petrolabis • †Petrolabis gurneyi – type locality for species • †Petrolestes – type locality for genus • †Petrolestes hendersoni – type locality for species • †Petrolystra – type locality for genus • †Petrolystra gigantea – type locality for species • †Petrolystra heros – type locality for species • †Petrunkevitchiana • †Petrunkevitchiana oculata – type locality for species • †Phaca • †Phaca wilmattae • Phalacrocorax • †Phalacrocorax mediterraneus • Phalaropus • †Phalaropus lobatus • †Phaseolites • †Phaseolites dedal – type locality for species • †Phasmagyps – type locality for genus • †Phasmagyps patritus – type locality for species • Pheidole • †Pheidole tertiaria – type locality for species • †Phenacodaptes • †Phenacodaptes sabulosus • . Charles R. Knight (1898). †Phenacodus'' • †Phenacodus grangeri • †Phenacodus intermedius • †Phenacodus magnus • †Phenacodus vortmani • †Phenacolestes – type locality for genus • †Phenacolestes mirandus – type locality for species • †Phenacolestes parallelus – type locality for species • Phenacomys • †Phenacomys deeringensis • †Phenacomys gryci – or unidentified comparable form • †Phenacomys intermedius • †Phenacoperga • †Phenacoperga coloradensis – type locality for species • †Phenacopsyche – type locality for genus • †Phenacopsyche larvalis – type locality for species • †Phenacopsyche vexans – type locality for species • †Phenanthera • †Phenanthera petalifera • , or mock-orange Philadelphus'' • †Philadelphus minutus – type locality for species • †Philanthus • †Philanthus saxigenus – type locality for species • Philhydrus • †Philhydrus scudderi • †Philonicus • †Philonicus saxorum – type locality for species • Philonthus • †Philonthus abavus • †Philonthus horni – type locality for species • †Philonthus invelatus – type locality for species • †Philonthus marcidulus – type locality for species • †Philoponites • †Philoponites praefractus – type locality for species • †Philorites – type locality for genus • †Philorites johannseni – type locality for species • †Philorites pallescens – type locality for species • †Phlaocyon'' • †Phlaocyon leucosteus – type locality for species • †Phloeonemites – type locality for genus • †Phloeonemites miocenus – type locality for species • Phloeosinus • †Phloeosinus scopulorum • Phloeotribus • †Phloeotribus zimmermanni – type locality for species • †Phora • †Phora tumbae – type locality for species • †Phrudopamera – type locality for genus • †Phrudopamera chittendeni – type locality for species • †Phrudopamera wilsoni – type locality for species • Phryganea • †Phryganea labefacta – type locality for species • †Phryganea miocenica – type locality for species • †Phryganea wickhami – type locality for species • , or pygmy short-horned lizard Phrynosoma'' • †Phrynosoma douglassi • †Phthinocoris – type locality for genus • †Phthinocoris colligatus – type locality for species • †Phthinocoris languidus – type locality for species • †Phthinocoris lethargicus – type locality for species • †Phthinocoris petraeus – type locality for species • †Phylledestes – type locality for genus • †Phylledestes vorax – type locality for species • †Phyllites • †Phyllites pagosensis • †Phyllobaenus • †Phyllobaenus wolcotti – type locality for species • Phyllobius • †Phyllobius antecessor – type locality for species • New World scarab †Phyllophaga'' • †Phyllophaga avus • †Phyllophaga disrupta – type locality for species • †Phyllophaga extincta – type locality for species • †Phymatodes • †Phymatodes grandaevus – type locality for species • †Phymatodes miocenicus – type locality for species • †Phymatodes volans – type locality for species • Pica • †Pica hudsonia • Picea • †Picea lahontense • †Picea magna – type locality for species • †Picea pinifructus • Picoides • †Picoides villosus • †Pidonia • †Pidonia ingenua – type locality for species • †Pidonia leidyi – type locality for species • †Piesma – tentative report • †Piesma rotunda – type locality for species • †Piezocoris – type locality for genus • †Piezocoris compactilis – type locality for species • †Piezocoris peremptus – type locality for species • †Piezocoris peritus – type locality for species • wasp †Pimpla'' • †Pimpla appendigera – type locality for species • †Pimpla eocenica – type locality for species • †Pimpla morticina – type locality for species • †Pimpla rediviva – type locality for species • †Pimpla revelata – type locality for species • †Pimpla senilis – type locality for species • Pinus • †Pinus florissanti • †Pinus hambachi • †Pinus wheeleri • †Pipiza • †Pipiza melanderi – type locality for species • †Pison • †Pison cockerellae – type locality for species • Pituophis • , or pine snake †Pituophis melanoleucus'' • Pityophthorus • †Pityophthorus opaculus • †Plagiopodiopsis • †Plagiopodiopsis cockerelliae • †Plagiopodiopsis scudderi • †Planocephalus – type locality for genus • †Planocephalus aselloides – type locality for species • Planolinoides • †Planolinoides duplex • †Plastomenus – tentative report • †Plastomenus lachrymalis • †Platanites • †Platanites marginata • , or plane tree Platanus'' • †Platanus florissanti – type locality for species • †Platanus nobilis • †Platanus raynoldsi • †Platanus raynoldsii • †Platanus wyomingensis • Plateumaris • †Plateumaris flavipes • †Plateumaris germari • †Plateumaris primaeva – type locality for species • †Plateumaris pusilla • †Platycheirus • †Platycheirus lethaeus – type locality for species • †Platycheirus persistens – type locality for species • Platydema • †Platydema antiquorum – type locality for species • †Platydema bethunei – type locality for species • †Platydracus • †Platydracus breviantennatus – type locality for species • of the genus Platygonus. Charles R. Knight (1922). †Platygonus • †Platygonus pollenae • Platynus • †Platynus florissantensis – type locality for species • †Platynus insculptipennis – type locality for species • †Platynus tartareus – type locality for species • †Platypedia • †Platypedia primigenia – type locality for species • †Platyphylax • †Platyphylax florissantensis – type locality for species • Platystethus • †Platystethus archetypus – type locality for species • †Platystethus carcareus – type locality for species • march flies Plecia'' • †Plecia akerionana • †Plecia axeliana – type locality for species • †Plecia decapitata – type locality for species • †Plecia explanata – type locality for species • †Plecia gradata – type locality for species • †Plecia melanderi – type locality for species • †Plecia orycta – type locality for species • †Plecia rhodopterina – type locality for species • †Plecia tessella – type locality for species • †Plecia winchesteri – type locality for species • †Plectiscidea • †Plectiscidea lanhami – type locality for species • †Plectrotetrophanes – type locality for genus • †Plectrotetrophanes hageni – type locality for species • †Plesiadapis • †Plesiadapis dubius • †Plesiadapis fodinatus • †Plesiobaena • †Plesiobaena antiqua – or unidentified comparable form • †Plesiosorex • †Plesiosorex coloradensis – type locality for species • †Pleurolicus • †Pliohippus'' • †Pliohippus mirabilis – type locality for species • †Plionictis • †Plionictis ogygia • †Plochionus • †Plochionus lesquereuxi – type locality for species • †Poabromylus • Podabrus • †Podabrus cupesoides – type locality for species • †Podabrus florissantensis – type locality for species • †Podabrus fragmentatus – type locality for species • †Podabrus wheeleri – type locality for species • Podiceps • Podilymbus • †Podilymbus podiceps • †Poebrotherium'' • †Poebrotherium eximium • †Poebrotherium wilsoni • †Poecilocapsus • †Poecilocapsus fremontii – type locality for species • †Poecilocapsus ostentus – type locality for species • †Poecilocapsus tabidus – type locality for species • †Poecilocapsus veterandus – type locality for species • †Poecilocapsus veternosus – type locality for species • †Poecilognathus – type locality for genus • †Poecilognathus stigmalis – type locality for species • †Pogonomyrmex • †Pogonomyrmex fossilis – type locality for species • †Polemius • †Polemius crassicornis – type locality for species • †Poliocoris – type locality for genus • †Poliocoris amnesis – type locality for species • †Polioschistus – type locality for genus • †Polioschistus lapidarius – type locality for species • †Polioschistus ligatus – type locality for species • †Poliosphageus – type locality for genus • †Poliosphageus psychrus – type locality for species • Polycentropus • †Polycentropus aeternus – type locality for species • †Polycentropus eviratus – type locality for species • †Polycentropus exesus – type locality for species • Polygraphus • †Polygraphus rufipennis • †Polygraphus wortheni – type locality for species • †Polysphincta • †Polysphincta inundata – type locality for species • †Polysphincta mortuaria – type locality for species • †Polysphincta petrorum – type locality for species • †Polystoechotites • †Polystoechotites piperatus – type locality for species • †Ponerites – type locality for genus • †Ponerites coloradensis – type locality for species • †Ponerites eocenicus – type locality for species • †Ponerites hypoponeroides – type locality for species • †Populites • †Populites heeri • Populus • †Populus cinnamomoides • †Populus crassa • †Populus pyrifolia • †Populus wilmattae • †Porizon • †Porizon exsectus – type locality for species • Porzana • , or sora †Porzana carolina'' • †Potamogeton • †Potamogeton geniculatus • †Potamogeton verticillatus • †Poteschistus – type locality for genus • †Poteschistus obnubilus – type locality for species • †Praepapilio – type locality for genus • †Praepapilio colorado – type locality for species • †Praepapilio gracilis – type locality for species • †Priabona • †Priabona florissantius – type locality for species • †Prinecphora – type locality for genus • †Prinecphora balteata – type locality for species • †Pristaulacus – type locality for genus • †Pristaulacus rohweri – type locality for species • †Pristaulacus secundus – type locality for species • †Pristichampsus • †Proapemon – type locality for genus • †Proapemon infernus – type locality for species • †Probathyopsis • †Probathyopsis harrisorum – type locality for species • †Procas • †Procas verberatus – type locality for species • †Procas vinculatus • †Procerberus • †Procerberus andesiticus – type locality for species • †Procerberus grandis – type locality for species • †Prochaetocnema – type locality for genus • †Prochaetocnema florissantella – type locality for species • †Procoris – type locality for genus • †Procoris bechleri – type locality for species • †Procoris sanctaejohannis – type locality for species • †Procrophius – type locality for genus • †Procrophius communis – type locality for species • †Procrophius costalis – type locality for species • †Procrophius languens – type locality for species • †Proctotrypes • †Proctotrypes exhumatus – type locality for species • †Procydnus – type locality for genus • †Procydnus devictus – type locality for species • †Procydnus divexus – type locality for species • †Procydnus eatoni – type locality for species • †Procydnus mamillanus • †Procydnus pronus – type locality for species • †Procydnus quietus – type locality for species • †Procydnus reliquus – type locality for species • †Procydnus vesperus – type locality for species • †Procymus – type locality for genus • †Procymus cockerelli – type locality for species • †Prodeporaides • †Prodeporaides laminarum – type locality for species • †Prodeporaides subterraneus – type locality for species • †Prodeporaides vulcan – type locality for species • †Prodeporaides wymani – type locality for species • †Prodeporaus • †Prodeporaus curiosum – type locality for species • †Prodeporaus exanimale – type locality for species • †Prodeporaus exilis – type locality for species • †Prodeporaus minutissimus – type locality for species • †Prodeporaus smithii – type locality for species • †Prodiacodon • †Prodiacodon tauricinerei • †Prodipodomys • †Prodipodomys centralis • †Prodryas'' – type locality for genus • †Prodryas persephone – type locality for species • †Proelectrotermes • †Proelectrotermes fodinae – type locality for species • †Progloma – type locality for genus • †Progloma rohweri – type locality for species • †Proheteromys • †Proheteromys sulculus • †Proiridomyrmex – type locality for genus • †Proiridomyrmex vetulus – type locality for species • †Prokalotermes • †Prokalotermes hagenii – type locality for species • †Prolibythea – type locality for genus • †Prolibythea florissanti – type locality for species • †Prolibythea vagabunda – type locality for species • †Prolimnocyon • †Prolimnocyon atavus • †Prolimnocyon haematus • †Prolygaeus – type locality for genus • †Prolygaeus inundatus – type locality for species • †Promioclaenus • †Promioclaenus acolytus • †Pronemobius • †Pronemobius ornatipes – type locality for species • †Pronemobius tertiarius – tentative report • †Propalaeanodon • †Prophilanthus – type locality for genus • †Prophilanthus destructus – type locality for species • †Proscalops • †Proscalops miocaenus – type locality for species • †Proscalops secundus – or unidentified comparable form • †Prosigara – type locality for genus • †Prosigara flabellum – type locality for species • †Prosoeca – type locality for genus • †Prosoeca florigera – type locality for species • Prosopis • †Prosopis linearfolia • †Protacnaeus – type locality for genus • †Protacnaeus tenuicornis – type locality for species • †Protapate – type locality for genus • †Protapate contorta – type locality for species • †Protazteca'' – type locality for genus • †Protazteca capitata – type locality for species • †Protazteca elongata – type locality for species • †Protazteca hendersoni – type locality for species • †Protazteca quadrata – type locality for species • †Proteleates – type locality for genus • †Proteleates centralis – type locality for species • †Protenor • †Protenor imbecillis – type locality for species • †Protictis • †Protictis proteus • †Protipochus – type locality for genus • †Protipochus vandykei – type locality for species • †Protochrysotoxum – type locality for genus • †Protochrysotoxum sphinx – type locality for species • †Protoedalea • †Protoedalea brachystoma – type locality for species • †Protohippus'' • †Protoibalia • †Protoibalia connexiva – type locality for species • †Protolabis • †Protolabis heterodontus • †Protoliarus – type locality for genus • †Protoliarus amabilis – type locality for species • †Protoliarus humatus – type locality for species • †Protomarctus • †Protomarctus optatus • †Protomelecta – type locality for genus • †Protomelecta brevipennis – type locality for species • †Protoncideres – type locality for genus • †Protoncideres primus – type locality for species • †Protoplatycera – type locality for genus • †Protoplatycera laticornis – type locality for species • †Protoreodon • †Protorohippus'' • †Protorohippus venticolum • †Protospermophilus • †Protospermophilus kelloggi • †Protostephanus – type locality for genus • †Protostephanus ashmeadi – type locality for species • †Prototomus • †Prototomus deimos • †Prototomus martis • †Prototomus phobos • †Prototomus secundarius • †Protungulatum • †Protungulatum donnae • Prunus • †Prunus coloradensis • †Prunus corrugis • †Prunus gracilis • †Psammaecius • †Psammaecius sepultus – type locality for species • †Psapharochus • †Psapharochus lengii – type locality for species • †Psephenus • †Psephenus lutulentus – type locality for species • Pseudacris • †Pseudacris triseriata • †Pseudaelurus'' • †Pseudaelurus stouti • †Pseudhipparion • †Pseudocimbex – type locality for genus • †Pseudocimbex clavatus – type locality for species • †Pseudocylindrodon • †Pseudocylindrodon neglectus – or unidentified comparable form • †Pseudomesauletes • †Pseudomesauletes culex – type locality for species • †Pseudomesauletes ibis – type locality for species • †Pseudomesauletes obliquus – type locality for species • †Pseudomesauletes striaticeps – type locality for species • Pseudomyrmex • †Pseudomyrmex extinctus – type locality for species • †Pseudoprotoceras'' • †Pseudoprotoceras longinaris • †Pseudosiobla • †Pseudosiobla megoura – type locality for species • †Pseudosiobla misera – type locality for species • †Pseudosmylidia – type locality for genus • †Pseudosmylidia relicta – type locality for species • †Pseudotetonius • †Pseudotetonius ambiguus • †Pseudotheridomys • †Pseudotheridomys hesperus • †Pseudotrimylus • †Pseudotrimylus compressus • †Pseudotrimylus roperi • †Psittacotherium'' • Ptelea • †Ptelea cassiodes • Pterocarya • †Pterocarya hispida • †Pterocarya roanensis – type locality for species • †Pterogaulus • †Pterogaulus laevis • †Pteromalus • †Pteromalus exanimis – type locality for species • †Pteromogoplistes • †Pteromogoplistes grandis – type locality for species • †Pteromogoplistes smithii – tentative report • †Pteronus • †Pteronus prodigus – type locality for species • Pterostichus • †Pterostichus pumpellyi – type locality for species • †Pterostichus walcotti • †Pterotriamescaptor – tentative report • †Pterotriamescaptor americanus – type locality for species • †Ptilodus'' • †Ptilodus kummae • †Ptosima • †Ptosima abyssa – type locality for species • †Ptosima schaefferi – type locality for species • †Ptosima silvatica – type locality for species • †Ptychoptera • †Ptychoptera miocenica – type locality for species • †Pulverflumen • Pycnoglypta • †Pycnoglypta lurida • †Pythoceropsis – type locality for genus • †Pythoceropsis singularis – type locality for species ==Q==

• †Quadratomus • †Quadratomus grandis • Quedius • †Quedius breweri – type locality for species • †Quedius chamberlini – type locality for species • †Quedius mortuus – type locality for species • , or oak tree Quercus'' • †Quercus balaninorum • †Quercus dumosoides • †Quercus greenlandica • †Quercus knowltoniana • †Quercus lyratiformis • †Quercus mohavensis • †Quercus orbata • †Quercus perdayana – type locality for species • †Quercus peritula • †Quercus schottii • †Quercus scottii • †Quercus scudderi • †Quercus sullyi ==R==

• Rallus • †Rallus limicola • and Cosoryx. Robert Bruce Horsfall (1913). †Ramoceros'' • †Ramoceros osborni • †Rana • †Rana catesbeiana • †Raphidia • †Raphidia creedei – type locality for species • †Reichertella • †Reichertella fasciata – type locality for species • Reithrodontomys • †Reithroparamys • †Reithroparamys debequensis – type locality for species • †Rembus – tentative report • †Rembus henshawi – type locality for species • Reticulitermes • †Reticulitermes creedei – type locality for species • †Reticulitermes fossarum – type locality for species • Rhabdomastix • †Rhabdomastix frigida – type locality for species • †Rhabdomastix labefactata – type locality for species • †Rhabdomastix praecursor – type locality for species • †Rhabdomastix primogenitalis • †Rhabdomastix profundi – type locality for species • †Rhabdomastix scudderi – type locality for species • †Rhadinobrochus • †Rhadinobrochus extinctus – type locality for species • snipefly †Rhagio'' • †Rhagio fossitius – type locality for species • †Rhagio wheeleri – type locality for species • †Rhagoderidea – type locality for genus • †Rhagoderidea striata – type locality for species • Rhagonycha • †Rhagonycha hesperus – type locality for species • †Rhamnites • †Rhamnites pseudostenophyllus • †Rhamnus • †Rhamnus cleburni • †Rhamnus goldiana • dance fly †Rhamphomyia'' • †Rhamphomyia aeterna – type locality for species • †Rhamphomyia craterae – type locality for species • †Rhamphomyia enena – type locality for species • †Rhamphomyia fossa – type locality for species • †Rhamphomyia hypolitha – type locality for species • †Rhamphomyia inanimata – type locality for species • †Rhamphomyia infernalis – type locality for species • †Rhamphomyia interita – type locality for species • †Rhamphomyia morticina – type locality for species • †Rhamphomyia senecta – type locality for species • †Rhamphomyia sepulta – type locality for species • †Rhamphomyia spodites – type locality for species • †Rhamphomyia tumulata – type locality for species • †Rhepocoris – type locality for genus • †Rhepocoris macrescens – type locality for species • †Rhepocoris minima – type locality for species • †Rhepocoris praetectus – type locality for species • †Rhepocoris praevalens – type locality for species • †Rhepocoris propinquans – type locality for species • Rhineastes • †Rhineastes peltatus • †Rhineastes smithi • , or North American worm lizard Rhineura'' • †Rhineura hatcheri • †Rhineura hatcherii – type locality for species • †Rhingia • †Rhingia zephyrea – type locality for species • †Rhingiopsis • †Rhingiopsis prisculus – type locality for species • Rhizophagus • †Rhizophagus remotus • leaf Rhus'' • †Rhus lesquereuxi • †Rhus migricans • †Rhus nigricans • †Rhus obscura • †Rhus stellariaefolia • †Rhyparochromus • †Rhyparochromus verrillii – type locality for species • †Rhysosternum • †Rhysosternum aeternabile – type locality for species • †Rhysosternum longirostre – type locality for species • †Rhyssa • †Rhyssa petiolata – type locality for species • †Rhyssomatus • †Rhyssomatus tabescens – type locality for species • †Ribes • †Ribes errans – type locality for species • †Riodinella – type locality for genus • †Riodinella nympha – type locality for species • †Robinia • †Robinia lesquereuxi • †Robinia wardi • †Rogas • †Rogas tertiarius – type locality for species • Rosa • †Rosa hilliae • moth †Rothschildia'' • †Rothschildia fossilis – type locality for species • Rubus • †Rubus coloradensis • †Runaria – type locality for genus • †Runaria ostenta – type locality for species • †Rupiforficula • †Rupiforficula inferna – type locality for species • †Rupiforficula labens – type locality for species • †Rupiforficula scudderi – type locality for species ==S==

• , or palmettos Sabal'' • †Sabal grayana • †Sabal imperialis • †Saccoloma • †Saccoloma gardneri • †Sackenia – type locality for genus • †Sackenia arcuata – type locality for species • Salix • †Salix coloradensis • †Salix coloradica – type locality for species • †Salix libbeyi • †Salix longiacuminata • †Salix longipetiolatum – or unidentified comparable form • †Salix ramaleyi • †Salix taxifolioides • †Sambucus • †Sambucus newtoni • †Saniwa'' • †Saperda • †Saperda caroli – type locality for species • †Saperda florissantensis – type locality for species • †Saperdirhynchus – type locality for genus • †Saperdirhynchus priscotitillator – type locality for species • †Sapindus • †Sapindus coloradensis • †Sapromyza • †Sapromyza veterana – type locality for species • †Saropogon • †Saropogon oblitescens – type locality for species • Sassafras • †Sassafras CR010 informal • †Sassafras hesperia'' • †Sassafras thermale • †Scalopoides • †Scalopoides isodens • Scaphinotus • †Scaphinotus serus – type locality for species • †Scaptolenopsis – type locality for genus • †Scaptolenopsis wilmattae – type locality for species • Sceloporus • †Sceloporus undulatus • †Scenopagus • †Scenopagus edenensis • †Scenopagus priscus • †Schaubeumys • †Schaubeumys clivosus • †Schaubeumys galbreathi • †Schmaltzia • †Schmaltzia vexans • †Sciabregma – type locality for genus • †Sciabregma rugosa – type locality for species • †Sciabregma tenuicornis – type locality for species • Sciara • †Sciara dormitans – type locality for species • †Sciara florissantensis – type locality for species • †Sciara requieta – type locality for species • †Sciara sopora – type locality for species • Sciomyza • †Sciomyza florissantensis – type locality for species • †Sciomyza manca • †Sciophila • †Sciophila mirandula – type locality for species • †Sciuravus • squirrel Sciurus'' • Scolytus • †Scolytus piceae • †Scoparidea – type locality for genus • †Scoparidea nebulosa – type locality for species • †Scottimus • †Scottimus ambiguus • †Scyphophorus • †Scyphophorus fossionis – type locality for species • †Scyphophorus laevis – type locality for species • †Scyphophorus tertiarius – type locality for species • †Scythropus • †Scythropus somniculosus – type locality for species • †Segestria • †Segestria scudderi – type locality for species • †Segestria secessa • , or spikemoss †Selaginella'' • †Selaginella berthoudi • †Selandria • †Selandria sapindi – type locality for species • †Semanotus • †Semanotus puncticollis – type locality for species • †Senoprosopis • †Senoprosopis antiquus – type locality for species • †Senoprosopis borealis – type locality for species • †Senoprosopis eureka – type locality for species • †Senoprosopis romeri – type locality for species • Sequoia • †Sequoia affinis'' • Serica • †Serica antediluviana – type locality for species • †Serica cockerelli – type locality for species • †Sespia • †Sespia nitida • †Setodes • †Setodes abbreviata – type locality for species • †Setodes portionalis – type locality for species • †Sialia • †Sibinia • †Sibinia whitneyi – type locality for species • †Sifrhippus • †Sifrhippus grangeri • †Sigaretta • †Sigaretta florissantella – type locality for species • Sigmodon • †Sigmodon curtisi • †Sigmodon minor • †Silpha • †Silpha beutenmuelleri – type locality for species • †Silpha colorata – type locality for species • †Silvius • †Silvius merychippi – type locality for species • Simplocaria • †Simplocaria tessellata • †Simpsonlemur • †Simpsonlemur jepseni • †Simpsonodus • †Simpsonodus chacensis • †Sinclairella • †Sinclairella dakotensis • (top) †Sinonyx'' – or unidentified comparable form • †Siphlurites – type locality for genus • †Siphlurites explanatus – type locality for species • †Siphonophoroides – type locality for genus • †Siphonophoroides antiqua – type locality for species • †Siphonophoroides gillettei – type locality for species • †Siphonophoroides lassa – type locality for species • †Siphonophoroides pennatus – type locality for species • †Siphonophoroides simplex – type locality for species • Sitona • †Sitona exitiorum – type locality for species • †Sitona paginarum • †Sitones • †Sitones exitiorum • Sitta • †Sitta carolinensis • †Smicrorhynchus • †Smicrorhynchus macgeei • †Smilax • †Smilax labidurommae • †Smilodectes'' • †Smilodectes gracilis • †Smilodectes mcgrewi • †Solenopsites – type locality for genus • †Solenopsites minutus – type locality for species • Sonoma • †Sonoma margemina • Sorex • †Sorex arcticus • †Sorex hoyi • †Sparganium • †Sparganium antiquum • Spea • , or plains spadefoot toad †Spea bombifrons'' • †Spermophagus • †Spermophagus pluto – type locality for species • †Spermophagus vivificatus – type locality for species • Spermophilus • †Spermophilus elegans – or unidentified comparable form • †Spermophilus lateralis • †Spermophilus richardsonii • †Spermophilus tridecemlineatus • †Sphegina • †Sphegina obscura – type locality for species • †Sphenocoelus'' • †Sphenocoelus uintensis • †Spiladomyia – type locality for genus • †Spiladomyia simplex – type locality for species • †Spiladopygia • †Spiladopygia exsulata – type locality for species • †Spiladopygia mortalis – type locality for species • Spilogale • †Spilogale putorius • †Spiniphora • †Spiniphora cockerelli – type locality for species • Spizella • '', or Brewer's sparrow †Spizella breweri • †Spodotribus – type locality for genus • †Spodotribus terrulentus – type locality for species • †Staphylea • †Staphylea acuminata • †Staphylea minutidens • Staphylinus • †Staphylinus lesleyi • †Staphylinus vetulus – type locality for species • †Staphylinus vulcan – type locality for species • †Steganus – type locality for genus • †Steganus barrandei – type locality for species • †Stenoechinus • †Stenoechinus tantalus • †Stenogomphus – type locality for genus • †Stenogomphus carletoni – type locality for species • ground beetle †Stenolophus'' • †Stenolophus religatus – type locality for species • †Stenopamera – type locality for genus • †Stenopamera subterrea – type locality for species • †Stenopamera tenebrosa – type locality for species • †Stenosphenus • †Stenosphenus pristinus – type locality for species • †Stenovelia – type locality for genus • †Stenovelia nigra – type locality for species • Stenus • †Stenus morsei – type locality for species • , or tropical chestnut Sterculia'' • †Sterculia rigida • †Sterictiphora • †Sterictiphora konowi – type locality for species • †Stibarus • †Stibarus obtusilobus • †Stibarus quadricuspis • Stilbus • †Stilbus pallidus • †Stipa • †Stipa florissanti • †Stolopsyche – type locality for genus • †Stolopsyche libytheoides – type locality for species • †Strategus • †Strategus cessatus – type locality for species • †Stratimus • †Stratimus strobeli • †Striaderes – type locality for genus • †Striaderes conradi – type locality for species • †Strigorhysis • †Strigorhysis huerfanensis – type locality for species • †Stygiochelys • †Stygiochelys estesi • †Stylinodon • †Stylinodon mirus • . Charles R. Knight (1890s). †Subhyracodon'' • †Subhyracodon mitis – type locality for species • †Subhyracodon occidentalis • †Submeryceros • †Submeryceros minor • Sylvilagus • †Sylvilagus audubonii • †Symphoromyia • †Symphoromyia subtrita – type locality for species • †Synchroa • †Synchroa quiescens – type locality for species • †Syntomostylus • †Syntomostylus rudis • Syrphus • †Syrphus aphidopsidis – type locality for species • †Syrphus carpenteri – type locality for species • †Syrphus eocenicus – type locality for species • †Syrphus hendersoni – type locality for species • †Syrphus lithaphidis – type locality for species • †Syrphus petrographicus – type locality for species • †Syrphus platychiralis – type locality for species • †Syrphus willistoni – type locality for species • †Systena • †Systena florissantensis – type locality for species ==T==