# List of the prehistoric life of Nebraska

This list of the prehistoric life of Nebraska contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Nebraska.

## Precambrian

The Paleobiology Database records no known occurrences of Precambrian fossils in Alabama.

## Paleozoic

* †Achistrum
* †Acroplous
** †Acroplous vorax
* †Adacrinus
** †Adacrinus edema – type locality for species
* †Aesiocrinus
** †Aesiocrinus detrusus
* †Agassizodus
** †Agassizodus variabilis
* †Aglaocrinus
** †Aglaocrinus compactus
* †Allosocrinus
** †Allosocrinus bronaughi
* †Ameura
** †Ameura missouriensis
* Ammodiscus
* †Amphiscapha
** †Amphiscapha muricata
* †Amphissites
* † Ananias
** †Ananias marcouiana – type locality for species
* †Anthracospirifer
* †Apographiocrinus
** †Apographiocrinus platybasis
** †Apographiocrinus typicalis
* †Atrypa
* †Aviculopinna
* †Barbclabornia
** †Barbclabornia luedersensis
* †Bathronocrinus
** †Bathronocrinus wolfriverensis
* Restoration of the Carboniferous Chimaera relative Belantsea †Belantsea
** †Belantsea occidentalis
* †Bobbodus – type locality for genus
** †Bobbodus schaefferi – type locality for species
* †Chonetes
* †Chonetinella
* †Cibolocrinus
* †Cladodus – type locality for genus
** †Cladodus knightianus – type locality for species
* †Composita
** †Composita subtilita
* †Concavicaris
** †Concavicaris sinuata – or unidentified comparable form
* †Contocrinus
** †Contocrinus stantonensis
* †Cooleyella
* †Coryellites
* †Costistricklandia
** †Costistricklandia castellana
* †Crurithyris
** †Crurithyris expansa
* Fossil of the Carboniferous shark Ctenacanthus †Ctenacanthus
** †Ctenacanthus amblyxiphias
* †Cymatospira
** †Cymatospira montfortianus
* †Delocrinus
** †Delocrinus admirensis
** †Delocrinus vastus
** †Delocrinus vulgatus
* †Deltodus
* †Derbyia
** †Derbyia crassa
* †Dibunophyllum
* †Ditomopyge
** †Ditomopyge scitula
** †Ditomopyge whitei
* †Elibatocrinus
* †Endothyra
* †Enteletes
** †Enteletes hemiplicata – or unidentified comparable form
* Eocaudina
* †Erisocrinus
** †Erisocrinus longwelli
** †Erisocrinus typus
* †Euphemites
** †Euphemites vittatus
* †Exocrinus
** †Exocrinus multirami
* †Exoriocrinus
* Fossil in multiple views of the Late Devonian-Permian tabulate coral Favosites †Favosites
* †Fissodus
** †Fissodus inaequalis
* †Gilliodus
** †Gilliodus peyeri
* †Glabrocingulum
** †Glabrocingulum grayvillense
* †Glaukosocrinus
** †Glaukosocrinus berryi – type locality for species
* Life restoration of the Carboniferous shark Glikmanius †Glikmanius
** †Glikmanius myachkovensis
** †Glikmanius occidentalis
* †Gorgonophontes
** †Gorgonophontes peleron – type locality for species
* †Graffhamicrinus
** †Graffhamicrinus boellstorffi – type locality for species
** †Graffhamicrinus magnijkus
** †Graffhamicrinus subcoronatus
* †Graphiocrinus
** †Graphiocrinus scopulus – or unidentified comparable form
* †Halogetocrinus
** †Halogetocrinus boellstorffae – type locality for species
* Fossil of the Ordovician-Silurian tabulate coral Halysites †Halysites
* †Helodus
** †Helodus rugosus
* †Heslerodus
** †Heslerodus divergens
* †Hollinella
* †Holmsella
* †Hustedia
** †Hustedia mormoni
* †Hypselentoma
** †Hypselentoma inornata – type locality for species
** †Hypselentoma perhumerosa
* †Hystriculina
** †Hystriculina wabashensis
* †Ianthinopsis
** †Ianthinopsis pulchellus
* †Iniopera
** †Iniopera richardsoni
* Life restoration of the Carboniferous Chimaera relative Iniopteryx †Iniopteryx – type locality for genus
** †Iniopteryx rushlau – type locality for species
** †Iniopteryx rushlaui
** †Iniopteryx tedwhitei – type locality for species
* †Inioxyele – type locality for genus
** †Inioxyele whitei – type locality for species
* †Isorthis
* †Janassa
** †Janassa maxima – type locality for species
** †Janassa unguicula – type locality for species
* †Juresania
* †Kallimorphocrinus
* †Linoproductus
* †Lissochonetes
** †Lissochonetes geronticus
* †Lophophyllidium
* Macrocypris
* Fossilized shell of the Carboniferous-Permian nautiloid cephalopod Metacoceras †Metacoceras
* †Microcaracrinus
** †Microcaracrinus twenhofeli
* †Monongahela
* †Moreyella
* †Mycterops
** †Mycterops whitei
* †Nebraskacrinus
** †Nebraskacrinus tourteloti
* †Neochonetes
** †Neochonetes granulifer
* †Neospirifer
** †Neospirifer dunbari
* †Nodosinella – tentative report
* Life restoration of the Carboniferous-Permian freshwater shark Orthacanthus †Orthacanthus
** †Orthacanthus compressus
* †Orthonema
** †Orthonema nebrascense – type locality for species
** †Orthonema subtaeniatum – type locality for species
* †Ozarkodina
* †Paleochiridota
* †Paramphicrinus
* †Parethelocrinus
** †Parethelocrinus variabilis
* †Parulocrinus
** †Parulocrinus blairi
* Fossil of the Carboniferous crustacean Peachocaris †Peachocaris
** †Peachocaris acanthouraea
* †Pentameroides
** †Pentameroides corrugatus
* †Peripristis
** †Peripristis semicircularis
* †Persephonichthys – type locality for genus
** †Persephonichthys chthonica – type locality for species
* †Petalocrinus
* †Petalodus
** †Petalodus alleghaniensis
** †Petalodus arcuatus – type locality for species
** †Petalodus destructor
* †Pharkidonotus
** †Pharkidonotus percarinatus – type locality for species
* †Phoebodus
** †Phoebodus knightianus – type locality for species
* †Plagioglypta
** †Plagioglypta meekiana – type locality for species
* Fossilized shell of the Silurian-Early Triassic sea snail Platyceras †Platyceras
* †Platyxystrodus – tentative report
** †Platyxystrodus occidentalis – type locality for species
* †Plaxocrinus
** †Plaxocrinus crassidiscus
* Pleurotomaria
** †Pleurotomaria haydeniana
* †Plummericrinus
* †Polusocrinus
** †Polusocrinus rosa
* †Polypora
* †Porpites
* †Promexyele
** †Promexyele bairdi – type locality for species
* †Protocaudina
* Psammosphaera
* †Ptylopora
* †Punctospirifer
** †Punctospirifer kentuckensis
* †Reticulatia
** †Reticulatia huecoensis
* †Retispira
** †Retispira marcouianus – type locality for species
* †Rhipidomella
** †Rhipidomella carbonaria
* †Rhombopora
* †Romerodus – type locality for genus
** †Romerodus orodontus – type locality for species
* †Royalella
** †Royalella swallowiana – type locality for species
* †Sciadiocrinus
** †Sciadiocrinus humilis
* †Shumardella
* †Sibyrhynchus
** †Sibyrhynchus denisoni
* †Stearoceras
** †Stearoceras sublaeve – type locality for species
* †Stellarocrinus
** †Stellarocrinus stillativus
* Life restorations of a male (foreground) and female (background) of the Late Devonian-Carboniferous Chimaera relative Stethacanthus †Stethacanthus
** †Stethacanthus altonensis
* †Streblodus
** †Streblodus angustus – type locality for species
* †Streptognathodus
* †Synarmocrinus
** †Synarmocrinus iatani
* †Syringopora
* †Tainoceras
** †Tainoceras nebrascense
* †Terpnocrinus
* †Tetravirga
* †Triceracrinus
* †Ulocrinus
* †Vertigocrinus
** †Vertigocrinus parilis
* †Wellerella
** †Wellerella cooperi – or unidentified comparable form
** †Wellerella delicatula – or unidentified comparable form
* †Wellergyi
** †Wellergyi subdecussatus – type locality for species

## Mesozoic

* †Acanthichthys – type locality for genus
** †Acanthichthys major – type locality for species
* †Acritodromum – type locality for genus
** †Acritodromum ellipticum – type locality for species
* †Anisodromum – type locality for genus
** †Anisodromum wolfei – type locality for species
* †Arcellites
** †Arcellites disciformis
* †Citrophyllum
** †Citrophyllum doylei – type locality for species
* Fossilized shell of the Late Cretaceous ammonoid Collignoniceras †Collignoniceras
** †Collignoniceras percarinatum
** †Collignoniceras praecox
** †Collignoniceras vermilionense
* †Crassidenticulum
** †Crassidenticulum decurrens
* †Densinervum – type locality for genus
** †Densinervum kaulii – type locality for species
* Dicotylophyllum
** †Dicotylophyllum aliquantuliserratum – type locality for species
** †Dicotylophyllum angularis – type locality for species
** †Dicotylophyllum expansolobum – type locality for species
** †Dicotylophyllum myrtophylloides – type locality for species
** †Dicotylophyllum rosafluviatilis – type locality for species
* †Didromophyllum – type locality for genus
** †Didromophyllum basingerii – type locality for species
* †Didymoceras
** †Didymoceras cheyennense
* †Inoceramus
** †Inoceramus apicalis
** †Inoceramus cuvieri
** †Inoceramus fragilis
* †Landonia – type locality for genus
** †Landonia calophylla – type locality for species
* †Longstrethia – type locality for genus
** †Longstrethia varidentata – type locality for species
* †Minerisporites
** †Minerisporites dissimilis – type locality for species
* Life restoration of two of the Late Cretaceous Mosasaurus †Mosasaurus
* †Mytiloides
** †Mytiloides labiatus
** †Mytiloides mytiloides
* †Pabiania – type locality for genus
** †Pabiania variloba – type locality for species
* †Pandemophyllum – type locality for genus
** †Pandemophyllum attenuatum – type locality for species
** †Pandemophyllum kvacekii – type locality for species
* †Perotriletes
** †Perotriletes striatus
* †Pseudoperna
** †Pseudoperna congesta
* †Reynoldsiophyllum
** †Reynoldsiophyllum nebrascense – type locality for species
* †Rhaeboceras
* †Rosselia – or unidentified comparable form
* †Scaphites
** †Scaphites patulus
* †Skolithos – or unidentified comparable form
* Animated life restoration of the Late Cretaceous plesiosaur Styxosaurus †Styxosaurus – type locality for genus
* †Volviceramus
** †Volviceramus involutus

## Cenozoic
### Selected Cenozoic taxa of Nebraska

* Acer
* Acipenser
* Acris
** †Acris crepitans – or unidentified comparable form
* †Acritohippus
** †Acritohippus isonesus
* †Aelurodon
* Life restoration of the Miocene camel Aepycamelus, or the long-necked camel. Heinrich Harder (1920). †Aepycamelus
** †Aepycamelus major
** †Aepycamelus robustus
* Agkistrodon
* †Agnotocastor
* †Agriochoerus
* †Agriotherium
* †Aletomeryx
* †Alforjas
* Alligator
* Alnus
* †Ambrosia
* †Ambystoma
** †Ambystoma maculatum
** †Ambystoma tigrinum
* Life restoration of the Miocene elephant relative Amebelodon. Margret Flinsch (1932). †Amebelodon
* Amia
** †Amia calva
* Ammospermophilus
* †Amphechinus
* †Amphicyon
** †Amphicyon frendens – type locality for species
** †Amphicyon galushai – type locality for species
** †Amphicyon ingens
* †Amphimachairodus
* †Anchitheriomys
* Fossilized mandibles of the Miocene three-toed horse Anchitherium †Anchitherium
* †Andrias
* Antrozous – or unidentified comparable form
* Apalone
** †Apalone spinifera
* †Aphelops
* Aplodinotus
** †Aplodinotus grunniens
* Aramus
* †Archaeocyon
* †Archaeohippus
* Life restoration of the Eocene-Oligocene entelodont mammal Archaeotherium †Archaeotherium
* †Arctodus
** †Arctodus simus
* †Arctonasua
* Ardea
* Arizona
* †Artemisia
* †Astrohippus
* Atractosteus
** †Atractosteus spatula
* Baiomys
* Balearica
* †Barbourofelis
** †Barbourofelis fricki
** †Barbourofelis morrisi – type locality for species
** †Barbourofelis whitfordi – type locality for species
* Bassariscus
* †Bathornis
** †Bathornis veredus
* †Bathygenys
* Betula – or unidentified comparable form
* Bison
** Mounted fossilized skeleton of the Pleistocene Bison latifrons, also known as the giant bison or long-horned bison †Bison latifrons
* Blarina
** †Blarina brevicauda
* †Blastomeryx
** †Blastomeryx gemmifer – type locality for species
* †Bootherium
** †Bootherium bombifrons – type locality for species
* †Borophagus
** †Borophagus diversidens
** †Borophagus pugnator
** †Borophagus secundus
* †Bothriodon
* †Brachycrus
* †Brachypsalis
* †Brachyrhynchocyon
* †Brontops
* Bufo
** †Bufo cognatus
* Burhinus
* Buteo
* †Calippus
* Life restoration of the Pliocene-Holocene camel Camelops †Camelops
** †Camelops hesternus
* Canis
** †Canis dirus
** †Canis edwardii
** †Canis ferox
** †Canis latrans
** †Canis lepophagus
* †Capromeryx
* †Carpocyon
* Carya
* Castor
** †Castor californicus – or unidentified comparable form
* †Castoroides
* Cedrela
* Celtis
* †Cephalogale
* Life restoration of the Miocene-Pleistocene horned gopher Ceratogaulus. Robert Bruce Horsfall (1913). †Ceratogaulus
** †Ceratogaulus anecdotus
** †Ceratogaulus hatcheri
** †Ceratogaulus rhinocerus
* †Cervalces
* Chaetodipus
** †Chaetodipus hispidus
* †Chamaecyparis
* Charina
* Chelydra
** †Chelydra serpentina
* †Chelydrops
** †Chelydrops stricta – type locality for species
* Chrysemys
** †Chrysemys picta
* Flowers of a living Cladrastis, or yellowwood Cladrastis
* Clethrionomys
** †Clethrionomys gapperi – or unidentified comparable form
* Cnemidophorus
** †Cnemidophorus sexlineatus
* Cocculus
* †Colodon
* Coluber
** †Coluber constrictor
* †Conuropsis
* †Cordia
* †Cormocyon
* †Cormohipparion
* †Cosoryx
** †Cosoryx furcatus
* Restoration of the Miocene palaeomerycid Cranioceras, a relative of modern deer, with anachronistic human to scale †Cranioceras
* Crataegus
* Crotalus
** †Crotalus horridus
* Cryptotis
* †Cynarctoides
** †Cynarctoides acridens
** †Cynarctoides emryi – type locality for species
** †Cynarctoides roii
* †Cynarctus
* †Cynelos
* †Cynodesmus
* Cynomys
* †Daphoenictis
* †Daphoenodon
* Life restoration of the Eocene-Miocene bear dog Daphoenus †Daphoenus – type locality for genus
* Dasypus
** †Dasypus bellus
* †Desmatippus
* †Desmatochoerus
* †Desmocyon
* †Diceratherium
* Dicrostonyx
** †Dicrostonyx torquatus
* Life restoration of the Eocene-Miocene false saber-toothed cat Dinictis. Robert Bruce Horsfall (1913). †Dinictis
* †Dinohippus
* †Dinohyus
** †Dinohyus hollandi – type locality for species
* †Diospyros
* Dipodomys
* †Dipoides
* †Diprionomys
* †Domnina
* †Dromomeryx
** †Dromomeryx borealis – type locality for species
* †Ectopocynus
* †Ekgmowechashala
** †Ekgmowechashala philotau
* Elaphe
** †Elaphe guttata
** †Elaphe obsoleta
** †Elaphe vulpina
* Life restoration of the Eocene-Oligocene anthracothere mammal Elomeryx †Elomeryx – tentative report
* Emydoidea
** †Emydoidea blandingii
* †Enhydrocyon
* †Epicyon
** †Epicyon haydeni
* Equus
** †Equus conversidens – or unidentified comparable form
** †Equus francisci
** †Equus simplicidens
* Erethizon
** †Erethizon dorsatum
* Esox
* Life restoration of the Miocene elephant relative Eubelodon †Eubelodon
* †Eucastor
* †Eucyon
** †Eucyon davisi
* Eumeces
* †Euoplocyon
* Felis
* †Floridatragulus
* †Fraxinus
* †Gaillardia
* Geochelone
* Geomys
** †Geomys bursarius
* Geranoaetus
* Gerrhonotus
* †Gigantocamelus
* Glyptemys
* Mounted fossilized skeleton of the Miocene-Pleistocene elephant relative Gomphotherium †Gomphotherium
* Gopherus
* Graptemys
* Grus
* †Hayoceros
* †Helodermoides
** †Helodermoides tuberculatus
* †Hemiauchenia
** †Hemiauchenia macrocephala
* †Herpetotherium
** †Herpetotherium fugax
* Life restoration of the Eocene-Oligocene dog Hesperocyon. Robert Bruce Horsfall (1913). †Hesperocyon
* †Hesperotestudo
* Heterodon
** †Heterodon nasicus
** †Heterodon platyrhinos
* †Heteromeryx
* †Hipparion
** †Hipparion forcei
* †Hippotherium
* Holbrookia – tentative report
* Restoration of Pliocene-Pleistocene Homotherium, or scimitar cat †Homotherium
** †Homotherium crusafonti
* †Hoplophoneus
* †Hyaenodon
** †Hyaenodon crucians
* Hyla
** †Hyla gratiosa – or unidentified comparable form
** †Hyla squirella – or unidentified comparable form
** †Hyla versicolor – or unidentified comparable form
* †Hypertragulus
* †Hypisodus
* †Hypohippus
* †Hypolagus
* †Hypsiops
* †Hyracodon
* Ictalurus
** †Ictalurus punctatus – or unidentified comparable form
* Ilex
* Fossilized skull of the Miocene bear Indarctos †Indarctos
* †Ischyrocyon
* †Ischyromys
* Juglans
* †Kalobatippus
* Kinosternon
** †Kinosternon flavescens
* †Lambdoceras
* Lampropeltis
** †Lampropeltis calligaster
** †Lampropeltis getulus
** †Lampropeltis triangulum
* Lasiurus
* Leiocephalus
* Lepisosteus
* Lepomis
** †Lepomis microlophus
* Restoration of the Oligocene-Miocene oreodont mammal Leptauchenia †Leptauchenia
* †Leptocyon
* †Leptomeryx
* Lepus
** †Lepus californicus – or unidentified comparable form
* Lichanura
* Liquidambar
* †Longirostromeryx
* Lontra
* Lycopodium
* †Machairodus
* Macrochelys
** †Macrochelys temminckii
* Mahonia
* †Mammacyon
* †Mammut
** †Mammut matthewi
* †Mammuthus
** Life restoration of a herd of Mammuthus columbi, or Columbian mammoths. The extent of the fur depicted is hypothetical. Charles R. Knight (1909). †Mammuthus columbi
* Martes
* Masticophis
** †Masticophis flagellum
* †Mediochoerus
* †Megacamelus
* †Megahippus
* †Megalictis
** †Megalictis ferox
* †Megalonyx
** †Megalonyx leptostomus
* †Megantereon – tentative report
* †Megatylopus
* †Meliosma
* †Menoceras
* Mephitis
** A living Mephitis mephitis, or striped skunk †Mephitis mephitis
* †Merychippus
* †Merychyus
* †Merycochoerus
* †Merycodus
* †Merycoides
* †Merycoidodon
* †Mesocyon – report made of unidentified related form or using admittedly obsolete nomenclature
* †Mesohippus
* †Mesoreodon
* Mounted fossilized skeleton of the Miocene-Pleistocene saber-toothed cat Metailurus †Metailurus
* †Metalopex
* †Metatomarctus
* †Michenia
* Micropterus
* †Microtomarctus
* Microtus
** †Microtus ochrogaster
** †Microtus pennsylvanicus
* Micrurus
* †Migmacastor – type locality for genus
** †Migmacastor procumbodens – type locality for species
* †Miniochoerus
* †Miohippus
* †Miotapirus
** †Miotapirus harrisonensis
* †Miotylopus
* †Monosaulax
* †Moropus
* Mustela
** †Mustela frenata
** †Mustela nigripes
** †Mustela vison
* Mycteria
* †Mylagaulus
* †Mylohyus
* Myotis
* †Nannippus
* †Nanotragulus
* Natrix – or unidentified comparable form
* †Neohipparion
* Mounted fossilized skeleton of the Miocene Neophrontops Neophrontops
* Neotamias
* Neotoma
* Nerodia
** †Nerodia rhombifera
** †Nerodia sipedon
* †Nexuotapirus
* †Nimravides
** †Nimravides pedionomus – type locality for species
* †Nordenosaurus
* †Nototamias
* †Nyssa
* Ochotona
** †Ochotona spanglei – or unidentified comparable form
* A living Odocoileus deer Odocoileus
** †Odocoileus virginianus
* †Oligobunis
* Ondatra
** †Ondatra zibethicus
* Onychomys
** †Onychomys leucogaster – or unidentified comparable form
* Opheodrys – or unidentified comparable form
* Ophisaurus
** †Ophisaurus ventralis
* Ortalis
* †Osbornodon
** †Osbornodon iamonensis
* †Oxetocyon
* †Oxydactylus
* Spiral-shaped fossilized burrow and associated skeleton of the Oligocene-Miocene beaver Palaeocastor †Palaeocastor
* †Palaeogale
* †Palaeolagus
* Panthera
** †Panthera leo
* †Paracynarctus
* †Paradaphoenus
* †Paraenhydrocyon
* †Parahippus
* †Paramylodon
** †Paramylodon harlani
* †Paramys
* Parascalops – or unidentified comparable form
* †Paratomarctus
* †Paratylopus
* †Parictis
* †Paronychomys
* †Parvitragulus – tentative report
* †Pediolophodon
* †Pediomeryx
* Fossilized skull of the Eocene-Oligocene lizard Peltosaurus †Peltosaurus
** †Peltosaurus granulosus
* †Peraceras
* Perognathus
* Peromyscus
* †Phasianus
* †Phenacocoelus
* Phenacomys
** †Phenacomys intermedius – or unidentified comparable form
* †Phlaocyon
** †Phlaocyon annectens
** †Phlaocyon mariae – type locality for species
** †Phlaocyon minor
** †Phlaocyon yatkolai – type locality for species
* Phrynosoma
** †Phrynosoma cornutum
* Picea
* Pinus
* Pituophis
** †Pituophis catenifer
** †Pituophis melanoleucus
* Platanus
* Mounted fossilized skeleton of the Miocene elephant relative Platybelodon †Platybelodon
* †Platygonus
** †Platygonus compressus
* †Pleiolama
* †Plesiogulo
* †Pliauchenia
* †Pliocyon
* †Pliohippus
* †Pliometanastes
* †Plionarctos
* †Plithocyon
* †Poebrotherium
* Illustration of a fossilized skull of the Oligocene false faber-toothed cat Pogonodon †Pogonodon
* Populus
* †Proantilocapra
* †Procamelus
** †Procamelus occidentalis
* †Procastoroides
* †Procranioceras
* †Promartes
* †Promerycochoerus
* †Proscalops
* †Prosynthetoceras
* †Proterix
* Life restoration of a female (left) and male of the Oligocene-Miocene even-toed ungulate Protoceras. Charles R. Knight (1896). †Protoceras
* †Protohippus
* †Protolabis
* †Protomarctus
* Prunus
** †Prunus acuminata – type locality for species
* †Psalidocyon
* Pseudacris
* †Pseudaelurus
* †Pseudhipparion
* †Pseudocyon
* †Pseudolabis
* †Pseudoprotoceras
* Pterocarya
* †Pylodictis
** †Pylodictis olivaris
* Quercus
** †Quercus parvula – type locality for species
* Life restoration of the Miocene-Pliocene pronghorn Ramoceros and Cosoryx. Robert Bruce Horsfall (1913). †Ramoceros
* †Ramoceros
* †Rana
** †Rana catesbeiana
** †Rana clamitans
** †Rana pipiens
** †Rana sylvatica
* †Regina – or unidentified comparable form
* Reithrodontomys
* †Repomys
* Rhineura
* Rhinocheilus
** †Rhinocheilus lecontei
* †Ribes
* Flowers of a living Robinia †Robinia
* Salix
* Salvadora
* †Sarcobatus – or unidentified comparable form
* †Satherium
** †Satherium piscinarium
* Scalopus
** †Scalopus aquaticus
* Scaphiopus
* †Scaphohippus
* Sceloporus
** †Sceloporus undulatus
* Sequoia – or unidentified comparable form
* †Serbelodon
* †Sespia
* Sigmodon
* Siren
* Sistrurus
** †Sistrurus catenatus
* †Skinnerhyus – type locality for genus
* Life restoration of the Pleistocene-Holocene saber-tooth cat Smilodon †Smilodon
** †Smilodon fatalis – or unidentified comparable form
* Sorex
** †Sorex arcticus
** †Sorex cinereus
** †Sorex palustris
* Spea
** †Spea bombifrons
* Spermophilus
** †Spermophilus elegans
** †Spermophilus franklinii – or unidentified comparable form
** †Spermophilus richardsonii
** †Spermophilus tridecemlineatus
* Spizaetus
* Mounted fossilized skeleton of the Pliocene-Pleistocene elephant relative Stegomastodon †Stegomastodon
* †Steneofiber
* †Stenomylus
** †Stenomylus gracilis
** †Stenomylus hitchcocki – type locality for species
* Sthenictis
* †Stylemys
* †Subdromomeryx
** †Subdromomeryx antilopinus
* †Subhyracodon
* †Sunkahetanka
** †Sunkahetanka geringensis
* Sylvilagus
** †Sylvilagus floridanus
* Synaptomys
** †Synaptomys cooperi
* Restoration of the Miocene protoceratid mammal Syndyoceras †Syndyoceras
** †Syndyoceras cooki – type locality for species
* †Synthetoceras
** †Synthetoceras tricornatus
* Tamias
* †Tanymykter
* Tapirus
** †Tapirus johnsoni – type locality for species
** †Tapirus polkensis – or unidentified comparable form
* Taxidea
** †Taxidea taxus
* Restoration of the Miocene-Pliocene rhinoceros Teleoceras †Teleoceras
** †Teleoceras major – type locality for species
* †Temnocyon
* †Tephrocyon
* Terrapene
** †Terrapene ornata – type locality for species
* †Tetrabelodon
* Thamnophis
** †Thamnophis proximus
** †Thamnophis radix
** †Thamnophis sirtalis
* Mounted fossilized skeleton of the Miocene-Pliocene ground sloth Thinobadistes †Thinobadistes
* Thomomys
* †Ticholeptus
* Tilia
* †Titanotylopus
* †Tomarctus
** †Tomarctus brevirostris
** †Tomarctus hippophaga – type locality for species
* Trachemys
* †Trigenicus
* †Trigonias
** †Trigonictis macrodon
* Trionyx
* Tropidoclonion – or unidentified comparable form
* †Tylocephalonyx
* Ulmus
* Urocyon
* †Ursavus
* †Ustatochoerus
* Vitis
* Vulpes
** †Vulpes velox
* †Ysengrinia
* †Yumaceras
* Zapus
** †Zapus hudsonius
* †Zodiolestes
* Known material diagram depicting the Miocene-Pleistocene mastodon relative Zygolophodon with a human to scale †Zygolophodon