This list of the Cenozoic life of South Dakota contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of South Dakota and are between 66 million and 10,000 years of age.
A
- †Adeloblarina
- †Adeloblarina berklandi – or unidentified comparable form
- †Adjidaumo
- †Adjidaumo lophatus
- †Adjidaumo minutus
- †Aelurodon
- †Aelurodon ferox
- †Aelurodon taxoides
- †Aepinacodon
- †Aepinacodon deflectus – type locality for species
- †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
- †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
- 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
- †Arctonasua
- †Arretotherium
- †Arretotherium fricki
- †Arretotherium leptodus – type locality for species
- Azolla
- †Azolla schopfi – type locality for species
B
- †Barbourofelis
- †Barbouromeryx
- †Barbouromeryx trigonocorneus
- †Bathornis
- †Bathornis celeripes
- †Bathornis veredus
- Bison
- 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
- †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
- 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
- †Cranioceras
- †Cranioceras unicornis
- Crotalus
- †Crucimys
- †Crucimys milleri
- †Cupidinimus
- †Cupidinimus smaragdinus – type locality for species
- †Cymaprimadon
- †Cymaprimadon kenni – type locality for species
- †Cynarctoides
- †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
- †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
- †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
- †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
- 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
- †Heptacodon
- †Heptacodon curtus – type locality for species
- †Heptacodon gibbiceps – type locality for species
- †Heptacodon occidentale
- †Herpetotherium
- †Herpetotherium fugax
- †Herpetotherium youngi
- †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
- †Hipparion
- †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
- †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
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
- †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
- †Megalictis
- †Megalictis ferox – type locality for species
- †Megalonyx
- †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
- †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
- †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
- 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
- †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
- †Phlaocyon
- Phrynosoma
- †Planera
- †Planera raynoldsi
- †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
- †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
- †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
- †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
- †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
- 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
- Spea
- †Spea neuter – type locality for species
- Spermophilus
- †Stegomastodon
- †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
- Sylvilagus
T
- Tapirus
- †Teleoceras
- †Teleodus – type locality for genus
- †Teleodus avus – type locality for species
- †Temperocastor
- †Temperocastor valentinensis
- †Tenudomys
- †Tenudomys macdonaldi – type locality for species
- Thamnophis
- †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
W
- †Wilsoneumys – tentative report
- †Wilsoneumys planidens
- †Wilsonosorex
- †Wilsonosorex bateslandensis
- †Woodoceras – type locality for genus
- †Woodoceras brachyops – type locality for species
X
- †Xenochelys
- †Xenochelys formosa – type locality for species
Z
References
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
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