List of the Mesozoic life of Wyoming

• †Abielites • †Abielites angusticarpus • sturgeon Acipenser'' • †Acipenser eruciferus • †Acutostrea • †Acutostrea plumosa • †Adocus • †Agathaumas – type locality for genus • †Agathaumas sylvestris – type locality for species • †Agerostrea • †Agerostrea mesenterica • †Agialopous – type locality for genus • †Agialopous wyomingensis – type locality for species • †Albanerpeton'' • †Albanerpeton galaktion • †Albanerpeton nexuosus – type locality for species • †Albertosaurus – or unidentified comparable form • †Alethesaurus – type locality for genus • †Alethesaurus quadratus – type locality for species • †Allacodon • †Allacodon lentus – type locality for species • †Allacodon pumilis – type locality for species • †Allognathosuchus • †Allosaurus'' – type locality for genus • †Allosaurus fragilis – type locality for species • †Allosaurus jimmadseni • †Alostera • †Alostera saskatchewanensis – type locality for species • †Alphadon • †Alphadon attaragos – type locality for species • †Alphadon halleyi • †Alphadon marshi • †Alphadon sahnii • †Altacreodus • †Altacreodus magnus • †Alzadites • †Alzadites westonensis – type locality for species • †Amblotherium – type locality for genus • †Amblotherium gracilis – type locality for species • †Amborellites – type locality for genus • †Amborellites wyomingensis – type locality for species • , or bowfin Amia'' • †Amia fragosa • †Amia uintaensis • †Amphicoelias • †Amphicoelias brontodiplodocus – type locality for species • †Amphidon – type locality for genus • †Amphidon superstes – type locality for species • †Anaklinoceras • †Anaklinoceras mortoni • †Anaschisma – type locality for genus • †Anaschisma brachygnatha – type locality for species • †Anaschisma browni – type locality for species • †Anceptophyllum – type locality for genus • †Anceptophyllum pulcrum – type locality for species • †Anchura – tentative report • †Ancorichnus • †Andromeda • †Andromeda grayana • †Anemia • †Anemia fremonti • †Anemia subcretacea • †Angistorhinus'' – type locality for genus • †Angistorhinus aeolamnis – type locality for species • †Angistorhinus gracilis – type locality for species • †Angistorhinus grandis – type locality for species • †Angistorhinus maximus – type locality for species • †Anisoceras • †Anisomyon • †Anisomyon borealis • †Anisomyon centrale • †Anisomyon patelliformis • †Anisomyon subovatus – or unidentified related form • †Anisomyon subovulatus • †Ankistrorhynchus • †Ankistrorhynchus washakiensis – type locality for species • †Ankylosaurus'' • †Ankylosaurus magniventris • †Anomalofusus – tentative report • Anomia • †Anomia tellinoides • Anona • †Anona robusta – tentative report • †Anthrotaxopsis • †Anthrotaxopsis tenuicaulis • Antrimpos • †Apatodonosaurus • †Apatodonosaurus grayi • †Apatosaurinae • †Apatosaurinae – type locality for genus – informal • †Apatosaurus'' • †Apatosaurus louisae • †Apatosaurus minimus • †Apeibopsis – tentative report • †Apeibopsis discolor • †Aploconodon – type locality for genus • †Aploconodon comoensis – type locality for species • Aporrhais • †Aporrhais biangulata • †Aquilina – type locality for genus • †Aquilina grossidentata – type locality for species • Aralia • †Aralia veatchii • †Araliaephyllum • †Araliaephyllum artocarpoides • tree Araucaria'' • †Araucarites • †Araucarites cuneatus – type locality for species • †Araucarites longifolia • †Araucarites wyomingensis – type locality for species • Arca – report made of unidentified related form or using admittedly obsolete nomenclature • †Arcellites • †Arcellites disciformis • †Archaeotriakis • †Archaeotriakis ornatus – type locality for species • †Archaeotriakis rochelleae • †Archaeotrigon – type locality for genus • †Archaeotrigon brevimaxillus – type locality for species • †Arcticoceras'' • †Arenicolites • †Aristolochites • †Aristolochites brittoni • †Ascarinites – type locality for genus • †Ascarinites communis – type locality for species • Aspideretes • †Aspideretoides • †Aspideretoides foveatus – or unidentified comparable form • †Asplenites • †Asplenites tenellum • , or spleenwort †Asplenium'' • †Asplenium haguei • †Asplenium neomexicanum • †Asplenium occidentale • †Astandes • †Astandes densatus • †Astarta • †Astarta packardi • Astarte • †Astarte gregaria • †Astarte livingstonensis • †Astarte meeki • †Astarte morion • †Athrotaxopsis • †Athrotaxopsis tenuicaulis • † Atira – tentative report • †Atira nebrascensis • †Atokatheridium – or unidentified comparable form • †Aublysodon'' • †Aublysodon mirandus • †Austrotindaria • †Austrotindaria antiqua • †Austrotindaria canalensis • †Austrotindaria svalbardensis • †Avernalia – type locality for genus • †Avernalia solida – type locality for species ==B==

• †Baculites'' • †Baculites asper • †Baculites asperiformis • †Baculites baculus • †Baculites clinolobatus • †Baculites cobbani • †Baculites codyensis • †Baculites crickmayi • †Baculites elaisi • †Baculites eliasi • †Baculites gilberti • †Baculites grandis • †Baculites gregoryensis • †Baculites haresi • †Baculites jenseni – or unidentified comparable form • †Baculites mariasensis • †Baculites mclearni • †Baculites obtusus • †Baculites perplexus • †Baculites reesidei • †Baculites rugosus • †Baculites scotti • †Baena • †Baena hatcheri – type locality for species • †Baena hayi – type locality for species • †Baena marshi – type locality for species • †Baieropsis • †Baieropsis adiantifolia • †Baieropsis pluripartita • †Baptanodon • †Baptanodon discus • †Baptanodon reedi – type locality for species • †Baptanodon robustus – type locality for species • Barbatia – tentative report • rearing to defend itself against a pair of the theropod Allosaurus †Barosaurus'' • †Barosaurus lentus • †Basilemys • †Basilemys sinuosa • †Batodon • †Batodon tenuis – type locality for species • †Belonostomus • †Belonostomus longirostris • Berenicea • Bombur • †Borealosuchus • †Borealosuchus sternbergii – type locality for species • †Boremys • †Borissiakoceras • †Borissiakoceras orbiculatum • Botula • †Botula ripleyana • , or blind shark Brachaelurus'' • †Brachaelurus bighornensis – type locality for species • †Brachiosaurus • †Brachybrachium – type locality for genus • †Brachybrachium brevipes – type locality for species • †Brachychampsa • †Brachychampsa montana • †Brachyphyllum • †Brachyphyllum crassum • †Brontopodus – or unidentified comparable form • †Brontopodus birdi • †Brontosaurus'' – type locality for genus • †Brontosaurus excelsus – type locality for species • †Brontosaurus parvus – type locality for species • †Brontosaurus yahnahpin – type locality for species • †Bryceomys • †Bullopsis • †Bullopsis cretacea – or unidentified related form ==C==

• †Cadoceras • Callista • †Callista deweyi • †Callista peplucida • †Calycoceras • †Calycoceras canitaurinum • †Camarasaurus'' – type locality for genus • †Camarasaurus grandis – type locality for species • †Camarasaurus lentus – type locality for species • †Camborygma • Campeloma • †Camptomus • †Camptomus amplus – type locality for species • †Camptonectes • †Camptonectes bellistriatus • †Camptonectes distans – or unidentified comparable form • †Camptonectes platessiformis • †Camptonectes stygius • †Camptosaurus'' • †Camptosaurus dispar – type locality for species • † Canna • †Canna magnifolia – tentative report • †Capillirhynchia • †Capillirhynchia gallatinensis – type locality for species • Cardium sp. • †Carpites • †Carpites lancensis • †Carpites verrucosus • †Carpites walcotti • †Carpolithus • †Carpolithus barrensis – type locality for species • †Carpolithus fasciculatus • †Carpolithus foenarius – type locality for species • †Carpolithus montiumnigrorum – type locality for species • †Carpolithus virginiensis • †Carthaginites • †Carthaginites aquilonius – type locality for species • †Cataceramus • †Cataceramus tenuilineatus • †Cedrobaena • †Cedrobaena brinkman • †Celastrophyllum • †Celastrophyllum gyminaefolium • , or staff vine †Celastrus'' – tentative report • †Celastrus taurinensis • †Cemeterius – type locality for genus • †Cemeterius monstrosus – type locality for species • †Centrophoroides • †Centrophoroides worlandensis – type locality for species • †Cephalotaxopsis • †Cephalotaxopsis magnifolia • †Ceramornis – type locality for genus • †Ceramornis major – type locality for species • †Ceratodus • †Ceratodus frazieri • †Ceratodus guentheri • †Ceratosaurus'' • Cercidiphyllum • †Cercidiphyllum arcticum • †Cercidiphyllum ellipticum • †Cercomya • †Cercomya punctata • †Ceritella • Cerithium – tentative report • †Chamops – type locality for genus • †Chamops segnis – type locality for species • †Champsosaurus'' • †Champsosaurus natator • †Chelonipus – or unidentified comparable form • Chiloscyllium • †Chiloscyllium missouriense • †Chirotherium • †Chirotherium barthii • Chlamys • †Chlamys nebrascensis • †Chondroceras • †Cimexomys • †Cimexomys minor • †Cimolestes • †Cimolestes incisus – type locality for species • †Cimolestes stirtoni – type locality for species • †Cimolodon • †Cimolodon nitidus – type locality for species • †Cimolodon peregrinus – type locality for species • †Cimolomys'' • †Cimolomys clarki • †Cimolomys gracilis – type locality for species • †Cimolomys parvus – type locality for species • †Cimolopteryx • †Cimolopteryx maxima – type locality for species • †Cimolopteryx rara • Cinnamomum • †Cinnamomum hesperium • †Cissitis • †Cissitis rocklandensis • Cissus • †Cissus lobato-crenata – tentative report • †Cladoceramus • †Cladoceramus undulatoplicatus – or unidentified related form • Cladophlebis'' • †Cladophlebis parva • †Cladophlebis readi – type locality for species • †Cladophlebis readii • †Cladophlebis wyomingensis – type locality for species • †Claraia • †Claraia clarai • †Claraia mulleri • †Claraia stachei • †Clemensodon – type locality for genus • †Clemensodon megaloba – type locality for species • †Clioscaphites • †Clioscaphites saxitonianus • †Clioscaphites vermiformis • †Coahuilites • †Coahuilites sheltoni • †Coelostylina • †Coelosuchus – type locality for genus • †Coelosuchus reedii – type locality for species • †Coelurus'' – type locality for genus • †Coelurus fragilis – type locality for species • †Collignoniceras • †Collignoniceras woollgari • †Colpodontosaurus – type locality for genus • †Colpodontosaurus cracens – type locality for species • †Comobatrachus – type locality for genus • †Comobatrachus aenigmaticus – type locality for species • †Comodactylus – type locality for genus • †Comodactylus ostromi – type locality for species • †Comodon – type locality for genus • †Comodon gidleyi – type locality for species • †Comonecturoides – type locality for genus • †Comonecturoides marshi – type locality for species • †Comotherium – type locality for genus • †Comotherium richi – type locality for species • †Compsemys • †Compsemys victa • †Confusionella • †Confusionella loczyi – type locality for species • . Othniel Charles Marsh (1892). †Coniophis'' – type locality for genus • †Coniophis precedens – type locality for species • †Coniopteris – tentative report • †Contogenys – or unidentified comparable form • †Corax • †Corbicella – tentative report • Corbula • †Corbula crassimarginata • †Corbula kanabensis • †Corbula munda • †Coriops • †Coriops amnicolus • †Cornophyllum • †Cornophyllum wardii • †Corosaurus'' • †Corosaurus alcovensis • Cossmannea • Crassatella • †Crassatella evansi • †Crassidenticulum • †Crassidenticulum aquilae – type locality for species • †Crassidenticulum decurrens • Crenella • †Cretorectolobus • †Cretorectolobus olsoni • †Cryptometoicoceras – type locality for genus • †Cryptometoicoceras mite – type locality for species • †Cryptorhytis • †Cryptorhytis cheyennensis • †Ctenacodon – type locality for genus • †Ctenacodon laticeps – type locality for species • †Ctenacodon scindens – type locality for species • †Ctenacodon serratus – type locality for species • †Cteniogenys – type locality for genus • †Cteniogenys antiquus – type locality for species • †Ctenostreon • †Ctenostreon gikshanensis – or unidentified comparable form • , or false ark shell Cucullaea'' • †Cucullaea haguei • †Cucullaea shumardi • †Cunningtoniceras • Cuspidaria • †Cuspidaria variablis • †Cycadeospermum • †Cycadeospermum rotundatum • †Cyclurus • †Cyclurus fragosus • †Cylindricum • †Cymbophora • †Cymbophora canonensis – or unidentified comparable form • †Cymbophora formosa • †Cymbophora holmesi • †Cyperacites • †Czekanowskia • †Czekanowskia nervosa ==D==

• †Dakotasaurus – type locality for genus • †Dakotasaurus browni – type locality for species • †Daspletosaurus • †Deinonychus'' • †Deinonychus antirrhopus • †Delphodon • †Delphodon comptus – type locality for species • †Deltatheroides – or unidentified comparable form • †Dennstaedtia • †Dennstaedtia fremonti • Dentalium • †Dentalium gracile • †Dentalium pauperculum • †Derrisemys • †Derrisemys sterea • with an anachronistic human to scale †Desmatosuchus'' • †Desmoscaphites • †Desmoscaphites bassleri • †Dewalquea • †Dewalquea pulchella • †Diastopora • †Diastopora cutleri – type locality for species • †Dicellonema • †Dicellonema abrekensis • †Dicotyledon • †Didelphodon'' • †Didelphodon vorax – type locality for species • †Didymoceras • †Didymoceras nebrascense • †Didymoceras stevensoni • †Dillenites • †Dillenites cleburni • †Dinochelys • †Dinochelys whitei • †Diospyros • †Diospyros stenosepala • †Diploconcha • †Diplocraterion • †Diplodocinae • †Diplodocinae – type locality for genus – informal • †Diplodocus'' • †Diplodocus carnegii – type locality for species • †Diplodocus hallorum • †Diplodocus longus • †Discoscaphites • †Docodon – type locality for genus • †Docodon affinis – type locality for species • †Docodon crassus – type locality for species • †Docodon striatus – type locality for species • †Docodon superus – type locality for species • †Docodon victor – type locality for species • †Dolichobrachium – type locality for genus • †Dolichobrachium gracile – type locality for species • †Dolichorhynchops'' • †Dolichorhynchops osborni • †Dombeyopsis • †Dombeyopsis colgatensis • †Dombeyopsis obtusa • †Dombeyopsis platanoides • †Dombeyopsis trivialis • †Doratodon – tentative report • †Dorsetisaurus • †Dosiniopsis • †Dosiniopsis deweyi • †Drepanocheilus • †Drepanocheilus evansi • †Drepanocheilus nebrascensis • †Drepanocheilus obesus • †Drepanocheilus scotti – or unidentified comparable form • †Drinker – type locality for genus • †Drinker nisti – type locality for species • †Dromaeosaurus'' • †Dryandroides • †Dryandroides lanceolata • †Dryolestes – type locality for genus • †Dryolestes priscus – type locality for species • †Dryolestes vorax • †Dryophyllum – type locality for genus • †Dryophyllum lanceolatum • †Dryophyllum polymorphum – type locality for species • †Dryophyllum subfalcatum • Dryopteris • †Dryopteris coloradensis • †Dryosaurus • †Dryosaurus altus – type locality for species • †Dryptosaurus – or unidentified comparable form • †Dunveganoceras • †Dunveganoceras pondi • †Dunveganoceras problematicum • †Dyslocosaurus – type locality for genus • †Dyslocosaurus polyonychius – type locality for species ==E==

• †Echidnocephalus – tentative report • †Edmontonia • †Edmontonia rugosidens – or unidentified comparable form • †Edmontosaurus • †Edmontosaurus annectens'' – type locality for species • †Egertonodus • †Elaphrosaurus – tentative report • †Elasmosaurus • †Elatides • †Ellipsoscapha • †Ellipsoscapha occidentalis • †Emarginachelys • †Empo • †Enneabatrachus – type locality for genus • †Enneabatrachus hechti – type locality for species • Entalis • †Entalis paupercula – tentative report • †Entalophora • †Entalophora stokesi – type locality for species • †Eobatrachus – type locality for genus • †Eobatrachus agilis – type locality for species • †Eocephalites • †Eocephalites primus • †Eokainaster – type locality for genus • †Eokainaster pewei • †Eopelobates'' • †Equisetites • †Equisetum • †Equisetum FF014 – informal • †Equisetum RS016 – informal • †Equisetum virginicum • †Essonodon • †Essonodon browni • †Estescincosaurus – type locality for genus • †Estescincosaurus cooki – type locality for species • †Eubaena – type locality for genus • †Eubaena cephalica – type locality for species • †Eubostrychoceras'' • †Eubostrychoceras matsumotoi – type locality for species • †Eubrachiosaurus – type locality for genus • †Eubrachiosaurus browni – type locality for species • †Eucalycoceras • †Eucalycoceras templetonense • †Eucrossorhinus • †Eucrossorhinus microcuspidatus • †Eumorphotis • †Eumorphotis multiformis • †Euomphaloceras • †Euomphaloceras merewetheri • †Eurysalenia • †Eurysalenia minima • †Euspira • †Euspira obliquata • †Euthlastus – type locality for genus • †Euthlastus cordiformis – type locality for species • †Eutrephoceras'' • †Eutrephoceras montanaense • †Eutretauranosuchus • †Eutretauranosuchus delfsi • †Exiteloceras • †Exiteloceras jenneyi • †Exogyra • †Exogyra costata • †Exostinus – type locality for genus • †Exostinus lancensis – type locality for species ==F==

• †Falepetrus • †Falepetrus barwini – type locality for species • , or tulip sea snail Fasciolaria'' • †Fasciolaria flexicostata – tentative report • †Feistmantelia – type locality for genus • †Feistmantelia oblonga – type locality for species • †Ficophyllum • †Ficophyllum serratum • Ficus • †Ficus fremonti • †Ficus Fremontii • †Ficus inaequalis • †Ficus paryearensis • †Ficus planicosta • †Ficus planicostata • †Ficus rockvalensis • †Ficus trinervis • †Filicites • †Filicites knowltoni • †Forresteria • †Forresteria stantoni • †Fosterovenator'' – type locality for genus • †Fosterovenator churei – type locality for species • †Foxraptor – type locality for genus • †Foxraptor atrox – type locality for species • †Fraxinus • †Fraxinus denticulata • †Fraxinus leii ==G==

• †Galeamopus'' • †Galeamopus hayi • †Galeamopus pabsti – type locality for species • †Gargoyleosaurus • †Gargoyleosaurus parkpinorum • †Geinitzia • †Geinitzia Jenneyi – type locality for species • †Geonomites • †Geonomites schimperi • Gerrhonotus – or unidentified comparable form • †Gervillaria • †Gervillaria montanaensis • †Gervillia • †Gervillia dolabrata • †Gervillia ussurica – or unidentified comparable form • †Gilmoremys • †Gilmoremys lancensis – type locality for species • Ginglymostoma • †Ginglymostoma globidens • Ginkgo'' • †Ginkgo adiantoides – tentative report • †Glasbius • †Glasbius intricatus – type locality for species • †Gleichenites • †Gleichenites sepulta • †Glyptops – type locality for genus • †Glyptops pervicax • †Glyptops plicatulus – type locality for species • Glyptostrobus • †Glyptostrobus brookensis • †Gobiconodon'' • †Gobiconodon ostromi • †Goniomya • †Goniomya montanaensis • †Goniopholis • †Gracilimanus • †Gracilimanus obscurus • †Grammatodon • †Grammatodon haguei • †Graphidula • †Graphidula alleni – or unidentified comparable form • †Graphidula culbertsoni'' • †Grewiopsis • †Grewiopsis saportana • †Gryphaea • †Gryphaea nebrascensis • †Gryphaea planoconvexa • †Gypsonictops • †Gypsonictops hypoconus – type locality for species • †Gypsonictops lewisi • †Gypsonicus • †Gypsonicus wyomingensis ==H==

• †Habrosaurus – type locality for genus • †Habrosaurus dilatus – type locality for species • †Hadrosauropodus • †Halymenites • †Halymenites major • †Hamites • †Hamites cimarronensis • †Hamites novimexicanus • †Hamites salebrosus • †Haplocanthosaurus'' • †Haptosphenus – type locality for genus • †Haptosphenus placodon – type locality for species • †Haresiceras • †Haresiceras natronense • †Harpactognathus – type locality for genus • †Harpactognathus gentryii – type locality for species • †Hatcheritherium – type locality for genus • †Hatcheritherium alpha – type locality for species • †Hausmannia • †Hausmannia AF017 • †Helopanoplia • †Helopanoplia distincta • Hemiaster • †Hemiaster humphreysanus • †Heptasuchus'' – type locality for genus • †Heptasuchus clarki – type locality for species • †Herpetarius • †Herpetarius humilis • †Hesperornithoides – type locality for genus • †Hesperornithoides miessleri – type locality for species • †Hoploscaphites birkelundae – type locality for species • †Hoploscaphites gilli • †Hoploscaphites macer • †Hoploscaphites nodosus • †Hoploscaphites plenus • †Hoploscaphites quadrangularis • †Hummelichelys • †Hummelichelys beecheri – type locality for species • †Hybodus'' • †Hybodus montanensis • †Hybodus wyomingensis – type locality for species • †Hyperodapedon • †Hyperodapedon sanjuanensis – or unidentified comparable form • †Hypotodus • †Hypotodus grandis • †Hypsodon – tentative report • †Hypsodon radiatulus ==I==

• †Ichthyodectes'' • †Icthyodectes – tentative report • †Icthyodesctes – tentative report • †Idiohamites • †Idiohamites bispinosus • †Iguanavus • †Iguanavus teres – type locality for species • with a human indicating its size †Inoceramus'' • †Inoceramus agdjakendensis – or unidentified comparable form • †Inoceramus americanus – type locality for species • †Inoceramus anglicus • †Inoceramus balchii • †Inoceramus barabini • †Inoceramus crispii • †Inoceramus deformis • †Inoceramus dimidius • †Inoceramus erectus – or unidentified related form • †Inoceramus fibrosus • †Inoceramus fragilis – or unidentified related form • †Inoceramus gibbosus • †Inoceramus glacierensis • †Inoceramus grandis • †Inoceramus incurvus • †Inoceramus lundbreckensis • †Inoceramus perplexus • †Inoceramus prefragilis • †Inoceramus proximus – or unidentified related form • †Inoceramus sagensis • †Inoceramus subcircularis • †Inoceramus subcompressus • †Inoceramus sublaevis • †Inoceramus tenuirostratus • †Inoceramus tenuiumbonatus – or unidentified comparable form • †Inoceramus turgidus – or unidentified related form • †Inoceramus typicus • †Inoceramus umbonatus • †Inoceramus undabundus • †Ischyrhiza • †Ischyrhiza avonicola'' – type locality for species • †Ischyrhiza basinensis – type locality for species • †Ischyrhiza mira • Isocrinus • †Isocrinus knighti • †Isocrinus wyomingensis • †Isocyprina • †Isocyprina cinnabarensis • Isognomon • †Isognomon perplana – or unidentified comparable form • Isurus – tentative report ==J==

'' • †Janumys • †Jeletzkytes • †Jeletzkytes dorfi – type locality for species • †Jensensispermum • †Judithemys • †Judithemys backmani ==K==

'' with an anachronistic human to scale • †Kaatedocus – type locality for genus • †Kaatedocus siberi – type locality for species • †Koskinonodon – type locality for genus • †Koskinonodon perfectus – type locality for species ==L==

• †Lamarqueavis • †Lamarqueavis minima – type locality for species • †Lamarqueavis petra – type locality for species • †Lamiasaura – type locality for genus • †Lamiasaura ferox – type locality for species • †Lanceosaurus – type locality for genus • †Lanceosaurus compressus – type locality for species • †Lanceosaurus hatcheri – type locality for species • †Laolestes – type locality for genus • †Laolestes eminens – type locality for species • †Laolestes goodrichi – type locality for species • †Laolestes oweni – type locality for species • †Laopteryx – type locality for genus • †Laopteryx priscus – type locality for species • †Laosaurus – type locality for genus • †Laosaurus celer – type locality for species • †Laurophyllum • †Laurophyllum coloradensis • †Laurophyllum meeki • †Laurophyllum salicifolium • †Laurophyllum wardiana • Laurus • †Laurus aspensis – type locality for species • †Lepidotes – or unidentified related form • Lepisosteus • †Lepisosteus occidentalis • †Leptalestes • †Leptalestes cooki – type locality for species • †Leptalestes krejcii • †Leptoceratops'' • †Leptoceratops gracilis • †Leptochamops • †Leptochamops denticulatus – type locality for species • †Leptochamops thrinax • †Leptochondria • †Leptochondria occidanea • †Leptostrobus • †Leptostrobus alatus – type locality for species • †Leptostrobus longifolia • †Leptostrobus longifolius • †Lesterwardia – type locality for genus • †Lesterwardia palustris – type locality for species • †Leucichthyops • †Leucichthyops vagans • †Leucicthyops • †Leucicthyops vagans • Lima • †Lima occidentalis • Lingula • †Lingula nitida – or unidentified comparable form • †Lingularia • †Lingularia borealis • †Lioplacodes – or unidentified comparable form • †Liostrea • †Liostrea strigilecula • Liquidambar • †Liquidambar fontanella – type locality for species • †Lisserpeton • †Lisserpeton bairdi • †Lissodus'' • †Lissodus griffisi – type locality for species • †Litakis – type locality for genus • †Litakis gilmorei – type locality for species • †Lonchidion – type locality for genus • †Lonchidion selachos – type locality for species • †Lonchisaurus – type locality for genus • †Lonchisaurus trichurus – type locality for species • †Lonchodytes – type locality for genus • †Lonchodytes estesi – type locality for species • †Lonchodytes pterygius – type locality for species • †Lophochelys • moon sea snail Lucina'' • †Lucina mattiformis – or unidentified comparable form • †Lucina occidentalis • †Lucina subundata • Lunatia – tentative report • Lygodium • †Lygodium AF030 – informal • †Lyosoma • †Lyosoma powelli ==M==

• †Macelognathus'' – type locality for genus • †Macelognathus vagans – type locality for species • Mactra • †Mactra emmonsi • †Mactromya – tentative report • †Magadiceramus • †Magadiceramus soukupi • †Magadiceramus subquadratus • †Magnoliophyllum • †Magnoliophyllum cordatum • †Malapoenna • †Malapoenna weediana – tentative report • Malletia • †Malletia stephensoni • †Manihotites • †Manihotites georgiana • †Martinectes • †Martinectes bonneri – type locality for species • †Matonidium • †Matonidium Althaausii • †Matonidium Althausii • †Mecochirus • †Megalneusaurus'' • †Megalneusaurus rex – type locality for species • †Megasphaeroceras • †Megasphaeroceras rotundum – or unidentified comparable form • †Meleagrinella • †Meleagrinella curta • †Melvius • †Melvius thomasi • †Meniscoessus • †Meniscoessus gracilis – type locality for species • †Meniscoessus intermedius • †Meniscoessus robustus – type locality for species • †Meniscoessus seminoensis – type locality for species • †Meniscognathus – type locality for genus • †Meniscognathus altmani – type locality for species • †Menispermites • †Menispermites belli • †Menispermites cockerelli • †Menispermites knightii • †Menuites'' • †Menuites complexus • †Mesembrioxylon • †Mesodma • †Mesodma formosa • †Mesodma hensleighi • †Mesodma primaeva • †Mesodma thompsoni – type locality for species • †Metaptychoceras • †Metoicoceras • †Metoicoceras geslinianum • †Metoicoceras mosbyense – or unidentified comparable form • †Metoicoceras praecox • †Micrabacia • †Micrabacia radiata • †Microtaenia • †Microtaenia paucifolia • †Microtaenia variabilis • †Microvenator'' • †Microvenator celer • †Minerisporites • †Minerisporites pseudorichardsonii • Modiolus • †Modiolus meekii • †Modiolus subimbricatus • †Montania – type locality for genus • †Montania glandulosa – type locality for species • †Moremanoceras • †Moremanoceras costatum • †Moremanoceras scotti • †Moriconia • †Moriconia cyclotoxon • †Morosaurus • †Myalina • †Myalina postcarbonica • †Myledaphus • †Myledaphus bipartitus • †Myophorella'' • †Myophorella yellowstonensis • Myrica • †Myrica bolanderi – tentative report • †Myrica nervosa • †Myrtophyllum • †Myrtophyllum torreyi • †Mytiloides • †Mytiloides stantoni • †Mytilus • †Mytilus whitei ==N==

• †Nageiopsis • †Nageiopsis angustifolia • †Nageiopsis longifolia • †Nanocuris • †Nanocuris improvida • †Nanomyops • †Nanosaurus • †Nanosaurus rex • †Nanotyrannus – tentative report • †Naomichelys • †Naomichelys speciosa • lotus †Nelumbo'' • †Nelumbo weymouthi – type locality for species • †Nelumbo weymouthii • †Nemocardium • †Nemocardium parahillanum • †Nemodon • †Nemodon eufalensis • †Nemodon grandis • †Neocardioceras • †Neocardioceras laevigatum – type locality for species • †Neocardioceras minutum – type locality for species • †Neocardioceras transiens • †Neocardioceras uptonense – type locality for species • †Neogastroplites • †Neogastroplites wyomingensis • †Neonereites – or unidentified comparable form • †Neonereites biserialis • †Neoplagiaulax • †Neoschizodus • †Neoschizodus laevigatus • †Nerinea – tentative report • †Neurankylus • †Neurankylus wyomingensis – type locality for species • †Nilsonia • †Nilsonia mehli • †Nilsonia nigricollensis • Nodosaria • †Nodosaurus – type locality for genus • †Nodosaurus textilis – type locality for species • †Nonactaeonina • †Nonactaeonina attenuata • †Normannites – tentative report • †Normannites crickmayi – or unidentified comparable form • †Nortedelphys • †Nortedelphys jasoni • †Nortedelphys magnus • †Nortedelphys minimus • Nucula'' • †Nucula cancellata • †Nucula nacatochana • †Nucula planimarginata • Nuculana • †Nuculana bisulcata • †Nuculana corsicana • †Nuculana equilateralis – tentative report • †Nuculana evansi • †Nuculana pittensis • †Nymphaeites • †Nymphaeites dawsoni ==O==

• †Obamadon • †Obamadon gracilis • †Obnixia – type locality for genus • †Obnixia thaynesiana • †Odaxosaurus – type locality for genus • †Odaxosaurus piger – type locality for species • sand shark Odontaspis'' • †Odontaspis cheathami – type locality for species • †Odontaspis steineri – type locality for species • †Oklatheridium • †Oklatheridium wiblei • †Oligoptycha • †Oligoptycha concinna • †Omasaria • †Onoclea • †Onoclea minima • †Opertochasma • †Ophiopsis • †Ophthalmosaurus • †Ophthalmosaurus natans • †Opisthias • †Opisthias rarus – type locality for species • †Opisthotriton • †Opisthotriton kayi • †Ornitholestes'' – type locality for genus • †Ornitholestes hermanni – type locality for species • †Ornithomimus • †Ornithomimus minutus • †Ornithomimus sedens – type locality for species • †Ornithomimus velox – or unidentified comparable form • †Orthotrigonia • †Orthotrigonia sohli – tentative report • †Osmakasaurus – tentative report • †Osmakasaurus depressus • Ostrea'' • †Ostrea inornata • †Othnielia • †Othnielosaurus • †Othnielosaurus consors – type locality for species • †Oxybeloceras • †Oxybeloceras crassum • †Oxytoma • †Oxytoma nebrascana ==P==

• †Pachycephalosaurus'' • †Pachycephalosaurus wyomingensis – type locality for species • †Pachyrhizodus • †Pachyteuthis • †Pachyteuthis densus • †Palaeoaster • †Palaeoaster inquirenda • †Palaeobatrachus • †Palaeobatrachus occidentalis – type locality for species • †Palaeocypraea • †Palaeocypraea squyeri – type locality for species • †Palaeosaniwa – type locality for genus • †Palaeosaniwa canadensis – type locality for species • †Paleoaster • †Paleoaster inquirenda • †Paleopsephurus • †Paleopsephurus wilsoni • †Paleorhinus • †Paleorhinus parvus – type locality for species • †Paliurus • †Paliurus minimus • †Paliurus zizyphoides – tentative report • †Pantosaurus – type locality for genus • †Pantosaurus striatus – type locality for species • †Parachondroceras • †Parachondroceras andrewsi • †Parachondroceras filicostatum • †Paracimexomys • †Paracimexomys priscus • †Paracredneria • †Paracredneria cretacea – type locality for species • †Paraderma – type locality for genus • †Paraderma bogerti – type locality for species • †Paradiscoglossus – type locality for genus • †Paradiscoglossus americanus – type locality for species • †Paralbula • †Paralbula casei • †Paramacellodus • †Paramacellodus keebleri • †Paranymphaea • †Paranymphaea hastata • †Parasaniwa – type locality for genus • †Parasaniwa wyomingensis – type locality for species • †Parastomechinus • †Parastomechinus brightoni • †Parasuchus'' • †Parasuchus bransoni – type locality for species • †Paressonodon • †Paressonodon nelsoni • †Pariguana – type locality for genus • †Pariguana lancensis – type locality for species • †Parikimys • †Parikimys carpenteri • †Parmicorbula • †Parmicorbula bisulcata • †Paronychodon • †Paronychodon lacustris – type locality for species • †Parvodus • †Paurodon – type locality for genus • †Paurodon valens – type locality for species • †Pecopteris • †Pecopteris borealis • †Pecopteris Geyleriana • Pecten • †Pecten nebrascensis • †Pectinodon'' – type locality for genus • †Pectinodon bakkeri – type locality for species • †Pediomys • †Pediomys elegans – type locality for species • †Pentacrinus • †Permophorus • †Permophorus triassicus – type locality for species • Persea – report made of unidentified related form or using admittedly obsolete nomenclature • †Persea hayana • †Petalolepis – tentative report • †Petalolepis fibrillatus • †Phlycticrioceras • †Phlycticrioceras trinodosus • †Phoenicites – or unidentified comparable form • Pholadomya'' • †Pholadomya inaequiplicata • †Pholadomya kingi • †Phragmites • †Phragmites falcata • †Phyllites • †Phyllites crassipes • †Phyllites cretaceous • †Phyllites dentata • †Phyllites ficifolius • †Phyllites grandifolius-cretaceous • Phyllodus • †Phyllodus toliapicus • Physa'' – or unidentified comparable form • †Piceoerpeton • †Piceoerpeton naylori • Pinna • †Pinna kingi • Pinus • †Pinus susquaensis • Pistacia • †Pistacia eriensis • †Pistia • †Pistia corrugata • †Placenticeras'' • †Placenticeras intercalare • †Placenticeras meeki • †Placenticeras pseudoplacenta • †Plagiostoma • †Plagiostoma occidentalis • Planorbis • †Plastomenus • †Platacodon – type locality for genus • †Platacodon nanus – type locality for species • †Platanites • †Platanites marginata • †Platanophyllum • †Platanophyllum montanum • †Platanophyllum platanoides • Platanus • †Platanus primaeva • †Platecarpus'' • †Platecarpus brachycephalus • †Platecarpus tympaniticus • †Platymya • †Platymya rockymontana • †Platypterygius • †Platypterygius americanus – type locality for species • †Plesiacanthoceras • †Plesiacanthoceras bellsanum – or unidentified comparable form • †Plesiacanthoceras wyomingense • †Plesiobaena • †Plesiobaena antiqua • †Plesiopleurodon'' – type locality for genus • †Plesiopleurodon wellesi – type locality for species • †Plesiosaurus • †Plesiosaurus shirleyensis – type locality for species • †Pleuromya • †Pleuromya haydeniana – type locality for species • †Pleuromya subcompressa • †Plicatolamna • †Plicatolamna arcuata • Plicatula • Polinices • †Polinices concinna – or unidentified related form • †Polyacrodus • †Polyacrodus parvidens – or unidentified comparable form • †Polycotylus • with an anachronistic human to scale †Poposaurus'' – type locality for genus • †Poposaurus gracilis – type locality for species • Populus • †Populus aspens • †Populus aspensis – type locality for species • †Porosoma • †Porosoma reesidei – type locality for species • †Portheus • †Postligata • †Postligata crenata • †Potamoceratodus • †Potamornis – type locality for genus • †Potamornis skutchi – type locality for species • †Powellia – type locality for genus • †Powellia oblongata – type locality for species • †Priacodon • †Priacodon ferox – type locality for species • †Priacodon grandaevus – type locality for species • †Priacodon lulli – type locality for species • †Priacodon robustus – type locality for species • †Prionocyclus • †Prionocyclus germari • †Prionocyclus hyatti • †Prionocyclus novimexicanus • †Prodesmodon – type locality for genus • †Prodesmodon copei – type locality for species • †Prodiplocynodon – type locality for genus • †Prodiplocynodon langi – type locality for species • †Promyalina • †Promyalina putiatinensis • †Promyalina spathi • †Pronoella • †Pronoella cinnabarensis • †Pronoella iddingsi – or unidentified comparable form • †Pronoella uintahensis • †Prorokia • †Prorokia fontenellensis • †Protalphadon • †Protalphadon lulli – type locality for species • †Protexanites • †Protexanites bourgeoisianus • †Protocardia • †Protocardia rara • †Protocardia schucherti – or unidentified comparable form • †Protolambda • †Protolambda florencae – type locality for species • †Protolambda hatcheri • †Protophyllocladus • †Protophyllocladus subintegrifolius • †Protophyllum • †Protoplatyrhina • †Protoplatyrhina renae • †Protungulatum'' – tentative report • Prunus • †Prunus aspensis – type locality for species • †Psalodon • †Psalodon fortis – type locality for species • †Psalodon marshi – type locality for species • †Psalodon potens – type locality for species • †Pseudoctenis • †Pseudoctenis AF013 – informal • †Pseudodontaspis – type locality for genus • †Pseudodontaspis herbsti – type locality for species • †Pseudoperna • †Pseudoperna congesta • †Pteraichnus • †Pteraichnus stokesi – type locality for species • †Pteranodon'' • †Pteranodon longiceps • †Pteria • †Pteria gastrodes • †Pteria linguaeformis • †Pteria linguiformis • †Pteria lingulaeformis • †Pteria ussurica – or unidentified comparable form • †Pterodactylus • †Pterodactylus montanus – type locality for species • †Ptilotodon • †Ptilotodon wilsoni • †Ptychodous • †Ptychotrygon • †Ptychotrygon boothi – type locality for species • †Ptychotrygon ellae – type locality for species • †Ptychotrygon greybullensis – type locality for species ==Q==

• †Quenstedtia • †Quenstedtia sublevis • , or oak tree †Quenstedtia sublewis'' • †Quercophyllum • †Quercophyllum gardneri • †Quercophyllum wyomingense – type locality for species • Quercus • †Quercus ellisiana • †Quercus stantoni • †Quercus stantonii • †Quercus viburnifolia • †Quereuxia • †Quereuxia angulata ==R==

• †Raninella • †Reesidella • †Retinovena – type locality for genus • †Retinovena fluvialis – type locality for species • †Retispira • †Retispira bittneri • Rhabdocolpus – tentative report • †Rhaeboceras • †Rhaeboceras halli • †Rhaeboceras subglobosum • †Rhamnus • †Rhamnus hirsuta'' • †Rhamnus minutus • Rhinobatos • †Rhinobatos casieri • †Rhizocorallium • †Rhynchosauroides – type locality for genus • †Rhynchosauroides palmatus – type locality for species • †Richardoestesia • †Richardoestesia isosceles • †Ropalonaria • †Ropalonaria arachne • Rostellaria – tentative report • †Rotodactylus – or unidentified comparable form ==S==

• †Sabalites • †Sabalites eocenica • †Sabalites montana • †Saccoloma – report made of unidentified related form or using admittedly obsolete nomenclature • †Saccoloma gardneri • †Saliciphyllum • †Saliciphyllum wyomingensis • , or willow Salix'' • †Salix cumberlandensis • †Salix frontierensis • †Salix lancensis • †Salpichlaena • †Salpichlaena AF003 – informal • †Sapindopsis • †Sapindopsis belviderensis • †Sapindopsis magnifolia • †Sapindopsis schultzi – type locality for species • †Sapindopsis schultzii • †Sapindopsis variabilis • †Sarjeantopodus – type locality for genus • †Sarjeantopodus semipalmatus – type locality for species • tree Sassafras'' • †Sassafras bradleyi – type locality for species • †Sassafras bradleyii • †Sassafras thermale • †Saurexallopus – type locality for genus • †Saurexallopus lovei – type locality for species • †Saurexallopus zerbsti – type locality for species • †Saurocephalus • †Saurolophus • †Sauropelta • †Sauropelta edwardsorum • with anachronistic humans to scale †Sauroposeidon'' • †Sauroposeidon proteles • †Saurornithoides – or unidentified comparable form • †Saurornitholestes • †Sauvagesia • †Sauvagesia austinensis – or unidentified comparable form • †Scapanorhynchus • †Scapanorhynchus texanus • †Scapherpeton • †Scapherpeton tectum • †Scaphites'' • †Scaphites aquilaensis • †Scaphites binneyi • †Scaphites hippocrepis • †Scaphites stantoni • †Scaphites ventricosus • †Scaphites whitfieldi • †Scleropteris • †Scleropteris distantifolia – type locality for species • †Scleropteris rotundifolia – type locality for species • †Scotiophryne • †Scotiophryne pustulosa • Scyliorhinus • †Scyliorhinus tensleepensis – type locality for species • †Selaginella • †Selaginella falcata – tentative report • †Semiungula – type locality for genus • †Semiungula assymetrica – type locality for species • tree with a human to scale Sequoia'' • †Sequoia cuneata • †Sequoia dakotensis • †Sequoia gracilia • †Sequoia gracilis • †Sequoia langsdorfii • †Sequoia reichenbachi • †Sequoia Reichenbachi • †Serrifusus • †Serrifusus dakotensis • †Skolithos • †Smilax • †Smilax coloradensis – tentative report • †Socognathus • †Socognathus brachyodon – type locality for species • †Sohlites • †Sohlites spinosus • †Sokophyllum – type locality for genus • †Sokophyllum dentatum – type locality for species • Solemya'' • †Solemya bilix • †Solemya obscura • †Solenoceras • †Solyma • †Sparganium • †Sparganium aspens • †Sparganium aspensis – type locality for species • Sphaerium – or unidentified comparable form • †Sphenodiscus • †Sphenodiscus lobatus – or unidentified comparable form • †Sphenodiscus pleurisepta • †Sphenolepidium • †Sphenolepidium Kurrianum • †Sphenolepidium parceramosum • †Sphenopteris • †Sphenopteris plurinervia • †Spiroceras • †Spiroceras orbignyi – or unidentified comparable form • Squalicorax'' • †Squalicorax kaupi • †Squalicorax pristodontus • †Squatirhina • †Squatirhina americana – type locality for species • †Squatirhina roessingi – type locality for species • †Staphylea • †Staphylea fremonti • †Staphylea fremontii • †Stegopelta – type locality for genus • †Stegopelta landerensis – type locality for species • †Stegosaurus'' – type locality for genus • †Stegosaurus affinis – type locality for species • †Stegosaurus armatus – type locality for species • †Stegosaurus longispinus – type locality for species • †Stegosaurus stenops • †Stegosaurus sulcatus – type locality for species • †Stegosaurus ungulatus – type locality for species • †Steinichnus • †Stemmatoceras • †Stemmatoceras albertense – or unidentified related form • Sterculia • †Sterculia mucronata • †Sterculia towneri • †Stokesosaurus – tentative report • †Stokesosaurus clevelandi • †Struthiomimus – or unidentified comparable form • with an anachronistic human to scale †Stygiochelys'' • †Styxosaurus • †Styxosaurus browni – type locality for species • †Supersaurus • †Supersaurus vivianae • †Syncyclonema • †Syncyclonema rigida • †Synechodus • †Synechodus turneri – type locality for species ==T==

• †Tancredia • †Tancredia transversa • †Tanycolagreus'' – type locality for genus • †Tanycolagreus topwilsoni – type locality for species • Tapeinidium • Tapeinidium undulatum – tentative report • †Tarrantoceras • †Tarrantoceras exile – type locality for species • †Tarrantoceras flexicostatum – type locality for species • †Tarrantoceras sellardsi • †Tatenectes • †Tatenectes laramiensis – type locality for species • †Tathiodon – type locality for genus • †Tathiodon agilis – type locality for species • †Telacodon • †Telacodon laevis – type locality for species • †Tenea • †Tenea circularis • †Tenontosaurus'' • †Tenontosaurus tilletti • Teredo • †Thalassinoides • †Theatonius – type locality for genus • †Theatonius lancensis – type locality for species • †Theretairus – type locality for genus • †Theretairus antiquus – type locality for species • †Thescelosaurus'' – type locality for genus • †Thescelosaurus neglectus – type locality for species • †Thescelus • †Thescelus insiliens – type locality for species • †Thoracosaurus – or unidentified comparable form • Thracia • †Thracia weedi • Thyasira • tree fern †Thyrsopteris'' • †Thyrsopteris brevifolia • †Thyrsopteris brevipennis • †Thyrsopteris crassinervis • †Thyrsopteris dentifolia – type locality for species • †Thyrsopteris elliptica • †Thyrsopteris pecopteroides • †Thyrsopteris pinnatifida • †Tinodon – type locality for genus • †Tinodon bellus – type locality for species • †Torosaurus – type locality for genus • †Torosaurus latus – type locality for species • †Torotix – type locality for genus • †Torotix clemensi – type locality for species • †Torvosaurus'' – type locality for genus • †Torvosaurus tanneri – type locality for species • †Trachodon • †Trachyscaphites • †Trachyscaphites redbirdensis • †Trachytriton • †Trachytriton vinculum • †Tragodesmoceras • †Tragodesmoceras carlilense • †Trapa • †Trapa microphylla • †Triceratops'' – type locality for genus • †Triceratops horridus – type locality for species • †Triceratops ingens – type locality for species • †Triceratops prorsus – type locality for species • †Triceratops sulcatus – type locality for species • †Trigonia • †Trigonia americana • †Trigonia elegantissima • †Trigonia montanaensis • †Trigonia quadrangularis • †Trioracodon • †Trioracodon bisulcus – type locality for species • Trochocyathus'' – tentative report • †Trochodendroides • †Troodon • †Troodon formosus • †Turgidodon • †Turgidodon rhaister – type locality for species • †Turgidodon russelli • Typha • †Tyrannosaurus – type locality for genus • †Tyrannosaurus rex – type locality for species ==U==