List of the Cenozoic life of South Dakota

• †Adeloblarina • †Adeloblarina berklandi – or unidentified comparable form • †Adjidaumo • †Adjidaumo lophatus • †Adjidaumo minutus • †Aelurodon • †Aelurodon ferox • †Aelurodon taxoides • †Aepinacodon • †Aepinacodon deflectus – type locality for species • , or the long-necked camel. Heinrich Harder (1920). †Aepycamelus'' • †Agnotocastor • †Agnotocastor coloradensis • †Agnotocastor praetereadens – type locality for species • †Agriochoerus • †Agriochoerus antiquus • †Agriochoerus gaudryi – type locality for species • †Alilepus – tentative report • †Alismaphyllites • †Alismaphyllites grandifolius • †Allantodiopsis • †Allantodiopsis erosa • Alligator • †Alligator prenasalis'' – type locality for species • †Allomys • †Allomys harkseni • †Allomys storeri – type locality for species • †Allophaiomys • †Allophaiomys pliocaenicus • †Alwoodia • †Ambystoma • †Ambystoma minshalli • †Ambystoma tigrinum • . Margret Flinsch (1932). †Amebelodon'' • †Ameiseophis • †Ameiseophis robinsoni • †Ampelopsis • †Ampelopsis acerifolia • †Amphechinus • †Amphechinus horncloudi • †Amphicaenopus • †Amphicaenopus platycephalus – type locality for species • †Amynodontopsis • †Amynodontopsis bodei • †Anchitherium • †Anchitherium clarencei • †Ansomys • †Ansomys cyanotephrus – type locality for species • Antilocapra • †Antilocapra americana • Apalone • †Apalone leucopotamica • †Aphelops • †Aphelops megalodus • †Apternodus • †Apternodus mediaevus • †Archaeocyon • †Archaeocyon leptodus • †Archaeocyon pavidus • †Archaeohippus • †Archaeohippus blackbergi – or unidentified comparable form • †Archaeolagus • †Archaeolagus macrocephalus – type locality for species • †Archaeolagus primigenius – type locality for species • †Archaeotherium'' • †Archaeotherium lemleyi – type locality for species • †Archaeotherium marshi – type locality for species • †Archaeotherium mortoni • †Archaeotherium trippensis – type locality for species • †Arctodus • †Arctodus simus • †Arctonasua • †Arretotherium • †Arretotherium fricki • †Arretotherium leptodus – type locality for species • Azolla • †Azolla schopfi – type locality for species ==B==

• †Barbourofelis'' • †Barbourofelis whitfordi • †Barbouromeryx • †Barbouromeryx trigonocorneus • †Bathornis • †Bathornis celeripes • †Bathornis veredus • Bison • †Bison latifrons • Blarina • †Blarina carolinensis – or unidentified comparable form • †Boochoerus • †Boochoerus angustus – type locality for species • †Bothriodon • †Bothriodon americanus – type locality for species • †Bothriodon rostratus • †Brachyerix • †Brachyerix incertis – or unidentified comparable form • †Brachygaulus – or unidentified comparable form • †Brachypsalis • †Brachypsalis modicus • †Brachyrhynchocyon'' • †Brachyrhynchocyon dodgei • †Brontops • †Brontops bicornutus • †Brontops brachycephalus • †Brontops dispar • †Brontops robustus – type locality for species • †Brontops tyleri – type locality for species • Bufo • †Bufo pliocompactilis • †Bufo woodhousei • Buteo • †Buteo grangeri – type locality for species ==C==

• †Calamagras • †Calamagras angulatus • †Calamagras weigeli • †Calippus • †Calippus martini • †Calippus placidus • †Camelops'' • Canis • †Canis dirus – or unidentified comparable form • †Canis latrans • †Canis lupus • †Capacikala • †Capacikala parvus • †Capatanka • †Capatanka gaulodon • †Capatanka minor • †Carpocyon • †Carpocyon robustus • Castor • †Castor canadensis – or unidentified comparable form • †Castor peninsulatus • †Catostomus • Celtis • †Centetodon • †Centetodon magnus • †Centetodon marginalis • †Centetodon wolffi • Cercidiphyllum • †Cercidiphyllum arcticum • boa Charina'' • †Charina prebottae • Chrysemys • †Chrysemys antiqua • †Clinopternodus • †Clinopternodus gracilis • Cnemidophorus • †Colodon • †Colodon cingulatus • †Colodon occidentalis • †Copemys • †Copemys longidens • †Coprophis – type locality for genus • †Coprophis dakotaensis – type locality for species • †Cormocyon • †Cormocyon haydeni – type locality for species • †Cormohipparion • †Cormohipparion fricki • †Cormohipparion quinni • †Cosoryx • †Cosoryx furcatus • Cranioceras, a relative of modern deer, with anachronistic human to scale †Cranioceras • †Cranioceras unicornis • Crotalus • †Crucimys • †Crucimys milleri • †Cupidinimus • †Cupidinimus smaragdinus – type locality for species • †Cymaprimadon • †Cymaprimadon kenni – type locality for species • †Cynarctoides • †Cynarctoides acridens • †Cynarctoides lemur • †Cynarctoides roii • †Cynarctus • †Cynarctus crucidens • †Cynodesmus • †Cynodesmus thooides • Cynomys ==D==

• †Dakotallomys • †Dakotallomys lillegraveni • †Dakotallomys pelycomyoides • †Dakotaophis – type locality for genus • †Dakotaophis greeni – type locality for species • †Daphoenus'' • †Daphoenus hartshornianus • †Daphoenus vetus • †Dendrochen – type locality for genus • †Dendrochen robusta – type locality for species • †Desmathyus • †Desmathyus pinensis • †Desmatippus • †Desmatippus texanus • †Desmatochoerus • †Desmatochoerus megalodon • †Desmocyon • †Desmocyon thomsoni • †Diceratherium • †Diceratherium annectens • †Diceratherium armatum – type locality for species • †Diceratherium radtkei • †Diceratherium tridactylum – type locality for species • †Dikkomys • †Dikkomys matthewi • †Dinictis • †Dinictis felina • †Dinohyus • †Dipoides • †Disallomys • †Disallomys robustus • †Domnina • †Domnina dakotensis – type locality for species • †Domnina gradata • †Domnina greeni – type locality for species • †Domninoides • †Domninoides riparensis – type locality for species • †Douglassciurus • †Douglassciurus bjorki – type locality for species • †Downsimus • †Downsimus chadwicki – type locality for species • †Duchesnehippus • †Duchesnehippus intermedius • †Duchesneodus'' • †Duchesneodus uintensis ==E==

• †Ectopocynus • †Ectopocynus antiquus • †Ekgmowechashala • †Ekgmowechashala philotau – type locality for species • Elaphe • †Elaphe nebraskensis • †Elaphe vulpina • †Elomeryx • †Elomeryx armatus – type locality for species • †Elomeryx garbanii – type locality for species • †Enhydrocyon • †Enhydrocyon crassidens – type locality for species • †Enhydrocyon pahinsintewakpa • . Charles R. Knight. †Entelodon'' • †Entelodon coarctatus – or unidentified comparable form • †Entoptychus • †Entoptychus leptophrys • †Eopelobates • †Eopelobates grandis – type locality for species • †Epeiromys • †Epicyon • †Epicyon saevus • Equus • †Equus francisci • †Equus giganteus – or unidentified comparable form • †Etheostoma • †Eubelodon'' • †Eubelodon morrilli • †Eucastor • †Eucastor tortus • †Eucommia • †Eucommia serrata • Eumeces • †Eumeces septentrionalis • †Eumys • †Eumys brachyodus • †Eumys elegans • †Eusmilus • †Eusmilus sicarius • †Eutypomys • †Eutypomys montanensis – or unidentified comparable form • †Eutypomys thomsoni – type locality for species • †Eutypomys wilsoni – or unidentified comparable form ==F==

• , or fig tree Ficus'' • †Ficus artocarpoides • †Ficus subtruncata • †Florentiamys • †Florentiamys agnewi – type locality for species • †Florentiamys tiptoni • †Fossorcastor • †Fossorcastor brachyceps ==G==

• †Galbreathia • †Galbreathia novellus • Geomys • †Geringia • †Geringia gloveri • †Geringia mcgregori • †Gigantocamelus • †Gigantocamelus spatulus • Glyptostrobus • †Glyptostrobus nordenskioldi • †Gomphotherium'' • †Gomphotherium obscurum • †Grangerimus • †Grangerimus dakotensis • Graptemys • †Gregorymys • †Gregorymys curtus – type locality for species • †Gregorymys formosus – type locality for species • †Gripholagomys – type locality for genus • †Gripholagomys lavocati – type locality for species • †Guildayomys • †Guildayomys hibbardi – or unidentified comparable form ==H==

• †Haplomys • †Haplomys galbreathi – type locality for species • †Heliscomys • †Heliscomys senex • †Hemiauchenia • †Hemicyon • †Hemicyon barbouri • †Heptacodon • †Heptacodon curtus – type locality for species • †Heptacodon gibbiceps – type locality for species • †Heptacodon occidentale • †Herpetotherium • †Herpetotherium fugax • †Herpetotherium youngi • . Robert Bruce Horsfall (1913). †Hesperocyon'' • †Hesperocyon gregarius • †Hesperolagomys – tentative report • †Hesperopetes • †Hesperopetes blacki – type locality for species • †Hesperopetes jamesi – type locality for species • †Hesperotestudo • †Hesperotestudo niobrarensis • Heterodon • †Heteromeryx • †Heteromeryx dispar – type locality for species • †Hibbarderix • †Hibbarderix obfuscatus • †Hibbardomys • †Hibbardomys marthae – or unidentified comparable form • †Hibbardomys zakrzewskii • . Heinrich Harder (1920). †Hipparion'' • †Hipparion tehonense • †Hippotherium • †Hippotherium dolichops – type locality for species • †Hitonkala • †Hitonkala andersontau – type locality for species • †Homotherium – or unidentified comparable form • †Hoplophoneus • †Hoplophoneus cerebralis • †Hoplophoneus mentalis • †Hoplophoneus occidentalis • †Hoplophoneus primaevus • †Hyaenodon'' • †Hyaenodon brevirostrus – type locality for species • †Hyaenodon crucians • †Hyaenodon horridus • †Hyaenodon montanus – or unidentified comparable form • †Hyaenodon mustelinus – type locality for species • Hyla • †Hypertragulus • †Hypertragulus calcaratus • †Hypertragulus dakotensis – type locality for species • †Hypisodus • †Hypisodus minimus • . Heinrich Harder (1920). †Hypohippus'' • †Hypolagus • †Hypolagus fontinalis – type locality for species • †Hypolagus vetus – or unidentified comparable form • †Hyporhina – type locality for genus • †Hyporhina antiqua – type locality for species • †Hyracodon • †Hyracodon leidyanus – type locality for species • †Hyracodon nebraskensis • †Hyracodon priscidens – or unidentified comparable form ==I==

• Ictalurus • †Ischyrocyon • †Ischyrocyon gidleyi • †Ischyromys'' • †Ischyromys typus ==J==

• †Javazapus • †Javazapus weeksi ==K==

• †Kirkomys • †Kirkomys martintau • †Kirkomys nebraskensis ==L==

• †Lambdoceras • †Lambdoceras hessei – type locality for species • Lampropeltis • †Lampropeltis similis • †Leidymys • †Leidymys blacki • †Leidymys juxtaparvulus • Lepisosteus • Lepomis • †Leptarctus • †Leptarctus primus – type locality for species • †Leptauchenia'' • †Leptauchenia decora – type locality for species • †Leptauchenia major – type locality for species • †Leptictis • †Leptictis dakotensis • †Leptictis haydeni • †Leptochoerus • †Leptochoerus elegans • †Leptochoerus supremus – type locality for species • †Leptocyon • †Leptocyon delicatus – type locality for species • †Leptocyon douglassi • †Leptocyon gregorii • †Leptocyon matthewi • †Leptocyon vafer – or unidentified comparable form • †Leptocyon vulpinus • †Leptomeryx'' • †Leptomeryx evansi • †Leptoromys • †Leptoromys wilsoni – type locality for species • Lepus • †Lepus americanus – or unidentified comparable form • †Lepus ennisianus – or unidentified comparable form • †Lignimus • †Lignimus austridakotensis – type locality for species • †Limnoecus • †Limnoecus compressus – or unidentified comparable form • †Limnoecus niobrarensis • †Longirostromeryx • †Longirostromeryx wellsi – type locality for species ==M==

• †Macrogenis • †Macrogenis crassigenis • †Macrognathomys • †Macrognathomys gemmacolis – type locality for species • †Macrorhineura – type locality for genus • †Macrorhineura skinneri – type locality for species • †Mammacyon • †Mammacyon obtusidens – type locality for species • †Mammuthus • , or Columbian mammoths. The extent of the fur depicted is hypothetical. Charles R. Knight (1909). †Mammuthus columbi'' • †Mammuthus primigenius • †Manitsha – type locality for genus • †Manitsha tanka – type locality for species • Martes • †Martes campestris • †Megacerops • †Megacerops coloradensis • †Megacerops curtus • †Megachoerus – tentative report • †Megachoerus latidens – type locality for species • †Megalagus • †Megalagus primitivus – or unidentified comparable form • †Megalagus turgidus • †Megaleptictis • †Megaleptictis altidens • †Megalictis • †Megalictis ferox – type locality for species • †Megalonyx • †Megalonyx leptostomus • †Megalonyx wheatleyi • †Megapaloelodus – type locality for genus • †Megapaloelodus connectens – type locality for species • †Megasminthus • †Megasminthus gladiofex – type locality for species • †Megasminthus tiheni • †Megoreodon • †Megoreodon grandis • †Meniscomys • †Meniscomys hippodus • †Menoceras'' • †Menoceras barbouri • †Menops • †Menops marshi • †Menops serotinus • †Menops walcotti • †Merychippus • †Merychippus insignis • †Merychyus • †Merychyus arenarum • †Merychyus minimus • †Merychyus novomexicanus • †Merycochoerus'' • †Merycochoerus chelydra • †Merycochoerus matthewi – type locality for species • †Merycodus • †Merycodus major – or unidentified comparable form • †Merycodus necatus • †Merycoides • †Merycoides longiceps • †Merycoides pariogonus – or unidentified comparable form • †Merycoidodon • †Merycoidodon bullatus – type locality for species • †Merycoidodon culbertsoni – type locality for species • †Merycoidodon major • †Mesocyon'' • †Mesocyon temnodon • †Mesohippus • †Mesohippus bairdi • †Mesohippus exoletus • †Mesoreodon • †Mesoreodon chelonyx • †Mesoreodon minor • †Mesoscalops • . Charles R. Knight (1896). †Metamynodon'' • †Metamynodon chadronensis – type locality for species • †Metamynodon planifrons • †Michenia • †Michenia exilis • Microtus • †Microtus meadensis • †Microtus paroperarius • Mictomys • †Mictomys kansasensis • †Mimomys • †Mimomys dakotaensis • †Miniochoerus • †Miniochoerus affinis • †Miniochoerus forsythae • †Miniochoerus gracilis • †Miniochoerus starkensis – type locality for species • †Mioheteromys • †Mioheteromys arcarius • †Miohippus'' • †Miohippus annectens – type locality for species • †Miohippus equiceps • †Miohippus equinanus • †Miohippus gemmarosae – or unidentified comparable form • †Miohippus gidleyi – type locality for species • †Miohippus grandis • †Miohippus intermedius – type locality for species • †Miohippus obliquidens – type locality for species • †Mionictis • †Mionictis pristinus • †Miortyx – type locality for genus • †Miortyx teres – type locality for species • †Miospermophilus – or unidentified comparable form • †Monosaulax • †Monosaulax curtus – or unidentified comparable form • †Moropus • Mustela • †Mustelavus • †Mustelavus priscus – type locality for species • †Mylagaulus • †Mylagaulus sesquipedalis – or unidentified comparable form • †Mystipterus • †Mystipterus martini – or unidentified comparable form ==N==

• †Nannippus'' • †Nanotragulus • †Nanotragulus loomisi • †Nanotragulus ordinatus – type locality for species • †Nelumbago • †Nelumbago montanum • †Neohipparion – type locality for genus • †Neohipparion affine – type locality for species • †Neonatrix • †Neonatrix elongata • Neotoma • †Neotoma amplidonta – type locality for species • Nerodia • †Nerodia sipedon • Nettion • †Nettion greeni – type locality for species • †Nexuotapirus • †Nexuotapirus marslandensis • †Niglarodon • †Niglarodon koerneri • †Nimravus'' • †Nimravus sectator – type locality for species • †Nothodipoides • †Nothodipoides planus • Notophthalmus • †Notophthalmus crassus – type locality for species • †Nototamias • †Nototamias quadratus • †Notropis • †Noturus – tentative report ==O==

• †Ocajila • †Ocajila makpiyahe – type locality for species • †Octacodon • †Octacodon valens – type locality for species • †Ogmophis • †Ogmophis miocompactus – type locality for species • †Oligoryctes • †Oligoryctes altitalonidus • †Oligoscalops • †Oligoscalops galbreathi • †Oligospermophilus • †Oligotheriomys • †Oligotheriomys magnus – type locality for species • Ondatra • †Ondatra annectens • Onychomys • †Onychomys pedroensis • †Oreodontoides • †Oreodontoides oregonensis • Ortalis • †Ortalis pollicaris – type locality for species • †Osbornodon • †Osbornodon sesnoni • †Otarocyon • †Otarocyon cooki • †Otarocyon macdonaldi – type locality for species • †Oxetocyon • †Oxetocyon cuspidatus – type locality for species • †Oxydactylus'' • †Oxydactylus lacota – type locality for species • †Oxydactylus wyomingensis – or unidentified comparable form ==P==

• †Paciculus • †Paciculus cedrus – type locality for species • †Paciculus montanus – or unidentified comparable form • †Paciculus nebraskensis – or unidentified comparable form • †Paciculus woodi • †Palaeoborus • †Palaeoborus rosatus – type locality for species • †Palaeocastor'' • †Palaeocastor peninsulatus • †Palaeocastor wahlerti • †Palaeogale • †Palaeogale dorothiae – type locality for species • †Palaeogale sectoria • †Palaeolagus • †Palaeolagus burkei • †Palaeolagus haydeni • †Palaeolagus hypsodus • †Palaeolagus intermedius • †Palaeolagus philoi – type locality for species • †Palaeonossax – type locality for genus • †Palaeonossax senectus – type locality for species • †Paleoheterodon • †Paleoheterodon tiheni • †Parablastomeryx • †Parablastomeryx gregorii • †Paracrax • †Paracrax gigantea – type locality for species • †Paracrax wetmorei – type locality for species • †Paradaphoenus • †Paradaphoenus minimus • †Paradaphoenus tooheyi – type locality for species • †Paradjidaumo • †Paradjidaumo trilophus • †Paraenhydrocyon • †Paraenhydrocyon robustus • †Parahippus • †Parahippus cognatus – or unidentified comparable form • †Parahippus pawniensis • †Parahippus pristinus – type locality for species • †Paramerychyus • †Paramerychyus harrisonensis • †Paramerychyus relictus • †Paramys • †Paramys relictus • †Paranymphaea • †Paranymphaea crassifolia • †Paranyroca – type locality for genus • †Paranyroca magna – type locality for species • †Parapliosaccomys • †Parapliosaccomys hibbardi – or unidentified related form • †Paratomarctus • †Paratomarctus euthos • †Paratylopus • †Paratylopus labiatus • †Parictis • †Parictis dakotensis – type locality for species • †Parictis gilpini – type locality for species • †Parictis major – type locality for species • †Parictis parvus – type locality for species • †Parvericius • †Parvericius montanus • †Peltosaurus'' • †Peltosaurus granulosus • †Pelycomys • †Pelycomys placidus • †Penetrigonias • †Penetrigonias dakotensis • †Peraceras • †Peraceras superciliosum • †Perchoerus • †Perchoerus minor • †Perchoerus nanus • †Perchoerus probus – or unidentified comparable form • Perognathus • †Perognathus brevidens • †Perognathus coquorum – or unidentified comparable form • †Perognathus trojectioansrum • Peromyscus • †Philotrox • †Philotrox condoni • †Phlaocyon • †Phlaocyon minor • Phrynosoma • †Phrynosoma douglassi • †Planera • †Planera raynoldsi • of the genus Platygonus. Charles R. Knight (1922). †Platygonus • †Plesiosorex • †Plesiosorex coloradensis • †Plesiosorex donroosai – type locality for species • †Pleurolicus • †Pleurolicus clasoni • †Pleurolicus dakotensis – type locality for species • †Pleurolicus sulcifrons • †Pliauchenia • †Pliauchenia magnifontis • †Pliogale • †Pliogale manka • †Pliohippus'' • †Pliohippus pernix • †Pliophenacomys • †Pliophenacomys osborni – or unidentified comparable form • †Pliosaccomys • †Pliosaccomys dubius – or unidentified comparable form • †Poebrotherium • †Poebrotherium wilsoni • †Pogonodon • †Pogonodon brachyops • †Pogonodon cismontanus – type locality for species • †Pogonodon eileenae • †Problastomeryx • †Problastomeryx primus • †Procamelus • †Procamelus grandis • †Procastoroides • †Procastoroides sweeti – or unidentified comparable form • †Procrax – type locality for genus • †Procrax brevipes – type locality for species • †Prodipodomys • †Prodipodomys idahoensis • †Prodipoides • †Prodipoides dividerus • †Proharrymys • †Proharrymys fedti – type locality for species • †Proharrymys schlaikjeri • †Proharrymys wahlerti • †Proheteromys • †Proheteromys gremmelsi – type locality for species • †Proheteromys ironcloudi – type locality for species • †Proheteromys matthewi – type locality for species • †Promartes • †Promartes gemmarosae • †Promartes lepidus – type locality for species • †Promartes olcotti • -like oreodont Promerycochoerus both onshore and in the water. Robert Bruce Horsfall (1913). †Promerycochoerus • †Promerycochoerus carrikeri • †Promerycochoerus superbus • †Promylagaulus • †Promylagaulus riggsi – type locality for species • †Proscalops • †Proscalops evelynae – type locality for species • †Proscalops secundus • †Proscalops tertius • †Prosciurus • †Prosciurus dawsonae • †Prosthennops • †Prosthennops niobrarensis – or unidentified comparable form • †Protapirus • †Protapirus obliquidens – type locality for species • †Protapirus simplex – type locality for species • †Proterix • †Proterix bicuspis • †Proterix loomisi • . Charles R. Knight (1896). †Protoceras'' • †Protoceras celer • †Protoceras skinneri – type locality for species • †Protohippus • †Protohippus supremus – type locality for species • †Protolabis • †Protolabis heterodontus • †Protospermophilus • Pseudacris • †Pseudacris clarki – or unidentified comparable form • †Pseudaelurus • †Pseudhipparion • †Pseudhipparion gratum • †Pseudhipparion retrusum • †Pseudoblastomeryx • †Pseudoblastomeryx advena • †Pseudograptemys • †Pseudograptemys inornata – type locality for species • †Pseudoprotoceras'' • †Pseudoprotoceras longinaris • †Pseudoprotoceras minor • †Pseudotheridomys • †Pseudotrimylus • †Pseudotrimylus dakotensis • †Pterogaulus • †Pterygoboa – type locality for genus • †Pterygoboa miocenica – type locality for species ==Q==

• †Quadrodens • †Quadrodens wilsoni – type locality for species • Querquedula • †Querquedula integra – type locality for species ==R==

• †Rana • (sometimes Lithobates catesbeianus), or American bullfrog †Rana catesbeiana'' • †Rana pipiens • Reithrodontomys • †Reithrodontomys moorei • Rhineura • †Rhineura hatcherii – type locality for species • †Rhineura sepultura – type locality for species • †Russellagus • †Russellagus vonhofi – or unidentified comparable form ==S==

• Salvadora • †Salvadora paleolineata • †Sanctimus • †Sanctimus stuartae – type locality for species • †Scalopoides • †Scalopoides isodens – or unidentified comparable form • Scaphiopus • †Scaptohyus • †Scaptohyus altidens – type locality for species • †Schaubeumys • †Schaubeumys clivosus • †Schaubeumys galbreathi • †Schaubeumys grangeri – type locality for species • †Schizodontomys • †Schizodontomys harkseni • †Scottimus • †Scottimus exiguus • †Scottimus lophatus • †Semotelus – tentative report • †Sespia • †Sespia nitida – type locality for species • †Sinclairella • †Sinclairella dakotensis • Sorex • †Sorex cinereus • Spea • †Spea neuter – type locality for species • Spermophilus • †Stegomastodon'' • †Stegomastodon mirificus • †Steneofiber • †Steneofiber fossor • †Steneofiber gradatus • †Stibarus • †Stibarus obtusilobus • †Stibarus quadricuspis • Strix • †Strix dakota – type locality for species • †Stylemys'' • †Stylemys nebrascensis • †Subhyracodon • †Subhyracodon mitis • †Subhyracodon occidentalis • †Sunkahetanka • †Sunkahetanka geringensis • Sylvilagus • †Sylvilagus floridanus ==T==

• Tapirus • †Teleoceras'' • †Teleoceras major • †Teleodus – type locality for genus • †Teleodus avus – type locality for species • †Temperocastor • †Temperocastor valentinensis • †Tenudomys • †Tenudomys macdonaldi – type locality for species • Thamnophis • †Thamnophis sirtalis • †Thinohyus • Thomomys • †Tisisthenes • †Tisisthenes parvus • †Titanotylopus'' • †Trigenicus • †Trigenicus profectus • †Trigonias • †Trigonias osborni • †Trigonias wellsi – type locality for species • †Trilaccogaulus • †Trilaccogaulus ovatus • †Triletes • †Triletes velus – type locality for species • †Tylionomys • †Tylionomys woodi • Tympanuchus • †Tympanuchus stirtoni – type locality for species • †Tyrannomys • †Tyrannomys harkseni ==U==