# List of the prehistoric life of Wyoming

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

## Precambrian

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

## Paleozoic
### Selected Paleozoic taxa of Wyoming

* †Actinoceras
* †Agassizodus
** †Agassizodus variabilis
* †Agnostogonus
* †Amphiscapha
* †Amplexus
** †Anarthraspis chamberlini
* †Archaeocidaris
* Life restoration of the Middle-Late Ordovician jawless fish Astraspis †Astraspis
** †Astraspis desiderata
* †Aviculopecten
** †Aviculopecten basilicus – or unidentified comparable form
** †Aviculopecten girtyi
** †Aviculopecten gryphus
** †Aviculopecten kaibabensis – or unidentified comparable form
* †Bellerophon
* †Blountiella
* †Bowmania
* †Bucheria – type locality for genus
* Restorative portrait of the Permian synapsid (mammal prescursor) Burnetia †Burnetia
* †Campodus
* †Caninia
* †Cardipeltis
** †Cardipeltis wallacii
* †Catenipora
* †Cavusgnathus
* †Cedaria
* †Cephalaspis
* †Charactoceras – tentative report
* †Chirognathus
* †Chonetes
* †Cleiothyridina
** †Cleiothyridina atrypoides
** †Cleiothyridina elegans – or unidentified related form
** †Cleiothyridina hirsuta
** †Cleiothyridina sublamellosa – or unidentified related form
* †Coleodus
* Fossilized shell of the Late Devonian-Permian brachiopod Composita †Composita
** †Composita elongata
** †Composita laevis – or unidentified related form
** †Composita mira
** †Composita ovata
** †Composita sigma
** †Composita subquadrata
** †Composita subtilita
** †Composita sulcata
* †Conocardium
* †Coosella
* †Coosia
* †Coosina
* †Cordylodus
* †Crepicephalus
* †Ctenacanthus
** †Ctenacanthus amblyxiphias
* †Cyrtogomphoceras
* †Deckera
* †Dentalium
* †Distichophytum
* †Drepanophycus
* †Earlandia
* †Edmondia
* Fossilized shells and restored appearances of the Middle-Late Ordovician nautiloid cephalopod Endoceras †Endoceras
* †Euomphalus
* †Favosites
* †Gastrioceras – report made of unidentified related form or using admittedly obsolete nomenclature
* †Genevievella
* †Geragnostus
* †Girvanella
* †Glikmanius
** †Glikmanius occidentalis
* †Glyptopleura
* †Goniatites – tentative report
* †Gosslingia
* Life restoration of the Permian Chimaera relative Helicoprion †Helicoprion
** †Helicoprion davisii
* †Homagnostus
* †Hyolithes
* †Hypseloconus
* †Idiognathoides
* †Ithyektyphus
* †Janassa
* †Kendallina
* †Kingstonia
* †Kionoceras
* †Kochoceras
* †Lambeoceras
* † Leclercqia
* †Lingula
* †Lingulella
* †Liroceras
* †Lonchocephalus
* †Maryvillia
* †Metacoceras
* Restoration of the Cambrian trilobite Meteoraspis †Meteoraspis
* †Micromitra
* †Minicephalus – type locality for genus
* †Naticopsis
** †Naticopsis judithae
** †Naticopsis kaibabensis
** †Naticopsis marthaae – or unidentified comparable form
* †Neospirifer
** †Neospirifer bakeri
* Nucula – tentative report
* †Olenoides
* †Ozarkodina
* †Paladin
* †Paractinoceras
* †Peripetoceras
* Fossilized shell of the Ordovician brachiopod Plaesiomys †Plaesiomys
* †Platyceras
* †Platystrophia
* †Posidonia
* †Prodentalium
* †Protaspis
* †Pseudomelania – tentative report
* †Psilophyton
* †Rawlinsella
* †Renalia
* †Sallya
* Fossil of the Cambrian-Ordovician trilobite Saukiella †Saukiella
* †Sawdonia
* Solemya
* †Solenochilus
* †Spiriferina
* †Spyroceras
* †Stearoceras
* †Streptognathodus
* †Strophomena
* †Syspacheilus
* †Tainoceras
* †Tetrataxis
* Fossil of the Cambrian trilobite Tricrepicephalus †Tricrepicephalus
* †Uncaspis
* †Uranolophus
* †Westonoceras
* †Wilkingia
* †Winnipegoceras
* †Worthenia
* †Zellerina

## Mesozoic
### Selected Mesozoic taxa of Wyoming

* Illustration of a living Acipenser sturgeon Acipenser
* †Adocus
* †Agathaumas – type locality for genus
** †Agathaumas sylvestris – type locality for species
* †Agerostrea
* †Albanerpeton
** †Albanerpeton galaktion
** †Albanerpeton nexuosus – type locality for species
* †Albertosaurus – or unidentified comparable form
* †Allognathosuchus
* Life restoration of the Late Jurassic theropod dinosaur Allosaurus †Allosaurus – type locality for genus
** †Allosaurus fragilis – type locality for species
* †Alphadon
** †Alphadon attaragos – type locality for species
** †Alphadon halleyi
** †Alphadon marshi
** †Alphadon sahnii
* †Amblotherium – type locality for genus
* Amia
* †Amphicoelias
** †Amphicoelias brontodiplodocus – type locality for species
* †Amphidon – type locality for genus
** †Amphidon superstes – type locality for species
* †Anaklinoceras
* †Anaschisma – type locality for genus
* †Ancorichnus
* †Andromeda
* †Anemia
* †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
* Life restoration of the Late Cretaceous armored dinosaur Ankylosaurus †Ankylosaurus
** †Ankylosaurus magniventris
* Anomia
* Anona
* Antrimpos
* †Apatosaurinae
* †Apatosaurus
** †Apatosaurus louisae
** †Apatosaurus minimus
* †Aploconodon – type locality for genus
** †Aploconodon comoensis – type locality for species
* Aporrhais
* †Aquilina – type locality for genus
* Aralia
* Foliage and cones of a living Araucaria tree Araucaria
* Arca – report made of unidentified related form or using admittedly obsolete nomenclature
* †Archaeotrigon – type locality for genus
* †Arcticoceras
* †Arenicolites
* Aspideretes
* †Asplenium
* †Astarta
* Astarte
* † Atira – tentative report
* †Atokatheridium – or unidentified comparable form
* †Aublysodon
** †Aublysodon mirandus
* Fossilized shell of the Late Cretaceous ammonoid cephalopod Baculites †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
* †Baptanodon
* Barbatia – tentative report
* Restoration of the Late Jurassic sauropod dinosaur Barosaurus rearing to defend itself against a pair of the theropod Allosaurus †Barosaurus
** †Barosaurus lentus
* †Basilemys
* †Belonostomus
** †Belonostomus longirostris
* Bombur
* †Borealosuchus
** †Borealosuchus sternbergii – type locality for species
* Botula
** †Botula ripleyana
* Brachaelurus
* †Brachiosaurus
* †Brachybrachium – type locality for genus
** †Brachybrachium brevipes – type locality for species
* †Brachychampsa
** †Brachychampsa montana
* †Brachyphyllum
* †Brontopodus – or unidentified comparable form
* Life restoration of a herd of the Late Jurassic sauropod dinosaur Brontosaurus †Brontosaurus – type locality for genus
** †Brontosaurus excelsus – type locality for species
** †Brontosaurus parvus – type locality for species
** †Brontosaurus yahnahpin – type locality for species
* †Bryceomys
* †Cadoceras
* Callista
* †Calycoceras
* †Camarasaurus – type locality for genus
** †Camarasaurus grandis – type locality for species
** †Camarasaurus lentus – type locality for species
* Campeloma
* †Camptosaurus
** †Camptosaurus dispar – type locality for species
* † Canna
* †Cedrobaena
* †Celastrus – tentative report
* †Ceramornis – type locality for genus
** †Ceramornis major – type locality for species
* †Ceratodus
* Restoration of the Late Jurassic ceratosaur Ceratosaurus †Ceratosaurus
* Cercidiphyllum
* Cerithium – tentative report
* †Chamops – type locality for genus
* †Champsosaurus
* †Chelonipus – or unidentified comparable form
* Chiloscyllium
* †Chirotherium
** †Chirotherium barthii
* Chlamys
* †Chondroceras
* †Cimexomys
** †Cimexomys minor
* †Cimolestes
** †Cimolestes incisus – type locality for species
** †Cimolestes stirtoni – type locality for species
* †Cimolodon
** †Cimolodon nitidus – type locality for species
* Life restoration of the face of the Late Cretaceous multituberculate mammal Cimolomys †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
* Cissus
* Cladophlebis
** †Cladophlebis parva
** †Cladophlebis readi – type locality for species
** †Cladophlebis wyomingensis – type locality for species
* †Claraia
** †Claraia clarai
** †Claraia mulleri
** †Claraia stachei
* †Clemensodon – type locality for genus
** †Clemensodon megaloba – type locality for species
* †Coelosuchus – type locality for genus
* Life restoration of the Late Jurassic primmitive tyrannosaur Coelurus †Coelurus – type locality for genus
** †Coelurus fragilis – type locality for species
* †Collignoniceras
** †Collignoniceras woollgari
* †Comobatrachus – type locality for genus
* †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
* †Comotherium – type locality for genus
* †Compsemys
* Illustration of fossilized vertebrae of the Late Cretaceous-Eocene snake Coniophis. Othniel Charles Marsh (1892). †Coniophis – type locality for genus
* †Corax
* Corbula
* †Coriops
* †Corosaurus
** †Corosaurus alcovensis
* Crenella
* †Cretorectolobus
** †Cretorectolobus olsoni
* †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
* Cucullaea
* †Cunningtoniceras
* Cuspidaria
* †Dakotasaurus – type locality for genus
* †Daspletosaurus
* Life restoration of the Early Cretaceous dromaeosaur ("raptor") Deinonychus †Deinonychus
** †Deinonychus antirrhopus
* †Deltatheroides – or unidentified comparable form
* †Dennstaedtia
* Dentalium
** †Dentalium pauperculum
* †Derrisemys
* †Desmatosuchus
* †Dicotyledon
* Restoration of the Late Cretaceous marsupial relative Didelphodon †Didelphodon
* †Didymoceras
** †Didymoceras nebrascense
** †Didymoceras stevensoni
* †Dinochelys
* †Diospyros
* †Diplocraterion
* †Diplodocinae
* Life restoration of the Late Jurassic long-necked dinosaur Diplodocus †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
* Mounted fossilized skeleton of the Late Cretaceous plesiosaur Dolichorhynchops †Dolichorhynchops
** †Dolichorhynchops osborni
* †Doratodon – tentative report
* †Dorsetisaurus
* †Drinker – type locality for genus
** †Drinker nisti – type locality for species
* †Dromaeosaurus
* †Dryolestes – type locality for genus
* Dryopteris
* †Dryosaurus
** †Dryosaurus altus – type locality for species
* †Dryptosaurus – or unidentified comparable form
* †Dyslocosaurus – type locality for genus
** †Dyslocosaurus polyonychius – type locality for species
* †Echidnocephalus – tentative report
* †Edmontonia
** †Edmontonia rugosidens – or unidentified comparable form
* †Edmontosaurus
** Life restoration of the Late Cretaceous duck-billed dinosaur Edmontosaurus annectens †Edmontosaurus annectens – type locality for species
* †Elaphrosaurus – tentative report
* †Elasmosaurus
* †Emarginachelys
* †Empo
* †Enneabatrachus – type locality for genus
** †Enneabatrachus hechti – type locality for species
* †Eobatrachus – type locality for genus
* †Eocephalites
* †Eopelobates
* †Equisetum
* †Essonodon
** †Essonodon browni
* Fossilized shell of the Late Cretaceous ammonoid cephalopod Eubostrychoceras †Eubostrychoceras
* †Eubrachiosaurus – type locality for genus
** †Eubrachiosaurus browni – type locality for species
* †Eucalycoceras
* †Eucrossorhinus
* †Euomphaloceras
* †Euspira
* †Euthlastus – type locality for genus
* †Eutrephoceras
* †Eutretauranosuchus
** †Eutretauranosuchus delfsi
* †Exiteloceras
* †Exogyra
** †Exogyra costata
* Fasciolaria
* Ficus
* †Forresteria
* †Fosterovenator – type locality for genus
* †Foxraptor – type locality for genus
* †Fraxinus
* †Galeamopus
** †Galeamopus hayi
** †Galeamopus pabsti – type locality for species
* Mounted fossilized skeleton of the Late Jurassic armored dinosaur Gargoyleosaurus †Gargoyleosaurus
** †Gargoyleosaurus parkpinorum
* Gerrhonotus – or unidentified comparable form
* †Gervillaria
* †Gervillia
* †Gilmoremys
** †Gilmoremys lancensis – type locality for species
* Ginglymostoma
* Ginkgo
** †Ginkgo adiantoides – tentative report
* †Glyptops – type locality for genus
* Glyptostrobus
* Fossilized skeleton of the Middle Jurassic-Late Cretaceous mammal Gobiconodon †Gobiconodon
* †Goniopholis
* †Gryphaea
* †Habrosaurus – type locality for genus
** †Habrosaurus dilatus – type locality for species
* †Hamites
* †Haplocanthosaurus
* †Harpactognathus – type locality for genus
** †Harpactognathus gentryii – type locality for species
* †Heptasuchus – type locality for genus
** †Heptasuchus clarki – type locality for species
* Life restoration of the Late Jurassic stegosaur Hesperosaurus †Hesperosaurus – type locality for genus
** †Hesperosaurus mjosi – type locality for species
* †Heteroceras
* †Hoploscaphites
** †Hoploscaphites birkelundae – type locality for species
** †Hoploscaphites gilli
** †Hoploscaphites nodosus
** †Hoploscaphites plenus
** †Hoploscaphites quadrangularis
* †Hybodus
** †Hybodus montanensis
** †Hybodus wyomingensis – type locality for species
* †Hyperodapedon
** †Hyperodapedon sanjuanensis – or unidentified comparable form
* †Ichthyodectes
* Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus 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
* Isognomon
* Isurus – tentative report
* †Janumys
* †Jeletzkytes
** †Jeletzkytes dorfi – type locality for species
* †Kaatedocus – type locality for genus
** †Kaatedocus siberi – type locality for species
* Fossilized skeleton of the Late Triassic amphibian Koskinonodon †Koskinonodon – type locality for genus
* †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
* †Laosaurus – type locality for genus
** †Laosaurus celer – type locality for species
* Laurus
* †Lepidotes – or unidentified related form
* Lepisosteus
* †Leptalestes
** †Leptalestes cooki – type locality for species
** †Leptalestes krejcii
* Life restoration of the Late Cretaceous primitive horned dinosaur Leptoceratops †Leptoceratops
** †Leptoceratops gracilis
* Lima
* Lingula
* Liquidambar
* †Lisserpeton
** †Lisserpeton bairdi
* †Lissodus
* †Lonchidion – type locality for genus
* †Lonchodytes – type locality for genus
** †Lonchodytes estesi – type locality for species
* Lucina
* Lunatia – tentative report
* Lygodium
* †Macelognathus – type locality for genus
* Mactra
* †Martinectes
** †Martinectes bonneri – type locality for species
* †Mecochirus
* Life restoration of the Late Jurassic plesiosaur Megalneusaurus †Megalneusaurus
** †Megalneusaurus rex – type locality for species
* †Megasphaeroceras
* †Melvius
* †Meniscoessus
** †Meniscoessus intermedius
** †Meniscoessus robustus – type locality for species
** †Meniscoessus seminoensis – type locality for species
* †Menuites
* †Mesodma
** †Mesodma formosa
** †Mesodma hensleighi
** †Mesodma primaeva
** †Mesodma thompsoni – type locality for species
* †Metoicoceras
** †Metoicoceras geslinianum
** †Metoicoceras mosbyense – or unidentified comparable form
* Life restoration of the Early Cretaceous oviraptorosaur Microvenator †Microvenator
** †Microvenator celer
* Modiolus
* †Morosaurus
* †Myledaphus
** †Myledaphus bipartitus
* †Myophorella
** †Myophorella yellowstonensis
* Myrica
* †Mytilus
* †Nanocuris
* †Nanosaurus
** †Nanosaurus rex
* †Nanotyrannus – tentative report
* †Naomichelys
* †Nelumbo
* †Neocardioceras
** †Neocardioceras laevigatum – type locality for species
** †Neocardioceras minutum – type locality for species
** †Neocardioceras transiens
** †Neocardioceras uptonense – type locality for species
* †Neoplagiaulax
* †Nerinea – tentative report
* Historical reconstruction of the holotype skeleton from 1921 †Nodosaurus – type locality for genus
** †Nodosaurus textilis – type locality for species
* †Normannites – tentative report
* Nucula
* †Obamadon
** †Obamadon gracilis
* †Odaxosaurus – type locality for genus
** †Odaxosaurus piger – type locality for species
* Odontaspis
* †Oklatheridium
* †Onoclea
* †Ophiopsis
* Life restoration of the Late Jurassic ichthyosaur Ophthalmosaurus †Ophthalmosaurus
** †Ophthalmosaurus natans
* †Opisthias
* †Opisthotriton
* †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
* †Osmakasaurus – tentative report
** †Osmakasaurus depressus
* Ostrea
* †Othnielia
* †Othnielosaurus
** †Othnielosaurus consors – type locality for species
* †Oxytoma
* Pachycephalosaurus †Pachycephalosaurus
** †Pachycephalosaurus wyomingensis – type locality for species
* †Pachyrhizodus
* †Pachyteuthis
* †Palaeobatrachus
* †Palaeosaniwa – type locality for genus
** †Palaeosaniwa canadensis – type locality for species
* †Paleopsephurus
** †Paleopsephurus wilsoni
* †Paleorhinus
** †Paleorhinus parvus – type locality for species
* †Paliurus
* †Pantosaurus – type locality for genus
** †Pantosaurus striatus – type locality for species
* †Paracimexomys
** †Paracimexomys priscus
* †Paradiscoglossus – type locality for genus
* †Paralbula
* †Paramacellodus
* Life restoration of the Late Triassic phytosaur Parasuchus †Parasuchus
* †Paressonodon
* †Pariguana – type locality for genus
* †Parikimys
* †Paronychodon
** †Paronychodon lacustris – type locality for species
* †Paurodon – type locality for genus
* †Pecopteris
* Pecten
* †Pectinodon – type locality for genus
** †Pectinodon bakkeri – type locality for species
* Persea – report made of unidentified related form or using admittedly obsolete nomenclature
* Phoenicites †Phoenicites – or unidentified comparable form
* Pholadomya
** †Pholadomya inaequiplicata
** †Pholadomya kingi
* †Phragmites
* Phyllodus
* Physa – or unidentified comparable form
* †Piceoerpeton
* Pinna
* Pinus
* Pistacia
* †Pistia
* †Placenticeras
** †Placenticeras intercalare
** †Placenticeras meeki
** †Placenticeras pseudoplacenta
* †Plagiostoma
* Planorbis
* Platanus
* Life restoration of the Late Cretaceous mosasaur Platecarpus †Platecarpus
** †Platecarpus tympaniticus
* †Platymya
* †Platypterygius
* †Plesiobaena
* †Plesiopleurodon – type locality for genus
** †Plesiopleurodon wellesi – type locality for species
* †Plesiosaurus
* Plicatula
* Polinices
* †Polycotylus
* Restoration of the Late Triassic crocodile relative Poposaurus with an anachronistic human to scale †Poposaurus – type locality for genus
** †Poposaurus gracilis – type locality for species
* Populus
* †Potamoceratodus
* †Potamornis – type locality for genus
** †Potamornis skutchi – 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
* †Prodesmodon – type locality for genus
* †Prodiplocynodon – type locality for genus
** †Prodiplocynodon langi – type locality for species
* †Protocardia
* Fossilized mandible of the Late Cretaceous-Paleocene mammal Protungulatum †Protungulatum – tentative report
* Prunus
* †Psalodon
** †Psalodon fortis – type locality for species
** †Psalodon marshi – type locality for species
** †Psalodon potens – type locality for species
* †Pseudoperna
** †Pseudoperna congesta
* †Pteraichnus
** †Pteraichnus stokesi – type locality for species
* Life restoration of the Late Cretaceous pterosaur Pteranodon †Pteranodon
** †Pteranodon longiceps
* †Pteria
* †Pterodactylus
** †Pterodactylus montanus – type locality for species
* †Ptilotodon
* †Ptychotrygon
** †Ptychotrygon boothi – type locality for species
* Quercus
* †Rhamnus
* Rhinobatos
* †Rhizocorallium
* †Richardoestesia
** †Richardoestesia isosceles
* Rostellaria – tentative report
* †Saccoloma – report made of unidentified related form or using admittedly obsolete nomenclature
* Salix
* †Salpichlaena
* Sassafras
* †Saurexallopus – type locality for genus
* †Saurocephalus
* †Saurolophus
* †Sauropelta
** †Sauropelta edwardsorum
* Diagram illustrating the Early Cretaceous long-necked dinosaur Sauroposeidon with anachronistic humans to scale †Sauroposeidon
** †Sauroposeidon proteles
* †Saurornithoides – or unidentified comparable form
* †Saurornitholestes
* †Sauvagesia
* †Scapanorhynchus
** †Scapanorhynchus texanus
* †Scapherpeton
* †Scaphites
** †Scaphites aquilaensis
** †Scaphites binneyi
** †Scaphites hippocrepis
** †Scaphites stantoni
** †Scaphites ventricosus
** †Scaphites whitfieldi
* †Scotiophryne
* Scyliorhinus
* A living Selaginella, or spikemoss †Selaginella
* Sequoia
* †Skolithos
* †Smilax
* †Socognathus
* Solemya
* †Sparganium
* Sphaerium – or unidentified comparable form
* †Sphenodiscus
** †Sphenodiscus lobatus – or unidentified comparable form
** †Sphenodiscus pleurisepta
* †Sphenopteris
* Restoration of the Late Cretaceous shark Squalicorax Squalicorax
** †Squalicorax kaupi
** †Squalicorax pristodontus
* †Squatirhina
** †Squatirhina americana – type locality for species
* †Staphylea
* †Stegopelta – type locality for genus
** †Stegopelta landerensis – type locality for species
* Restoration of the Late Jurassic stegosaur Stegosaurus †Stegosaurus – type locality for genus
** †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
* Sterculia
* †Stokesosaurus – tentative report
** †Stokesosaurus clevelandi
* †Struthiomimus – or unidentified comparable form
* †Styxosaurus
** †Styxosaurus browni – type locality for species
* Restoration in multiple views of the Late Jurassic sauropod dinosaur Supersaurus with an anachronistic human to scale †Supersaurus
** †Supersaurus vivianae
* †Tanycolagreus – type locality for genus
** †Tanycolagreus topwilsoni – type locality for species
* †Tatenectes
** †Tatenectes laramiensis – type locality for species
* †Tathiodon – type locality for genus
* †Tenea
* †Tenontosaurus
** †Tenontosaurus tilletti
* Teredo
* †Thalassinoides
* †Theatonius – type locality for genus
* †Theretairus – type locality for genus
* Life restoration of the Late Cretaceous herbivorous dinosaur Thescelosaurus †Thescelosaurus – type locality for genus
** †Thescelosaurus neglectus – type locality for species
* †Thoracosaurus – or unidentified comparable form
* Thracia
* Thyasira
* †Thyrsopteris
* †Tinodon – type locality for genus
* †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
* †Tragodesmoceras
** †Tragodesmoceras carlilense
* †Trapa
* Mounted fossilized skeleton of the Late Cretaceous horned dinosaur Triceratops †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
* †Troodon
** †Troodon formosus
* Typha
* Fossilized skeleton of the Late Cretaceous tyrannosaur Tyrannosaurus †Tyrannosaurus – type locality for genus
** †Tyrannosaurus rex – type locality for species
* †Uluops – type locality for genus
** †Uluops uluops – type locality for species
* Unio
* Vanikoro
* †Viburnum
* Vitis
* Viviparus – or unidentified comparable form
* †Weichselia
* †Williamsonia – tentative report
* †Woodwardia
* †Xenocephalites
* †Xiphactinus
* Yoldia
* Fossil of the Early Triassic-Eocene cycad-like frond Zamites †Zamites
** †Zamites arcticus
** †Zamites borealis
** †Zamites brevipennis
* †Zapsalis – or unidentified comparable form
* †Zephyrosaurus – or unidentified comparable form
* †Zofiabaatar – type locality for genus
** †Zofiabaatar pulcher – type locality for species

## Cenozoic
### Selected Cenozoic taxa of Wyoming

* †Abuta – or unidentified related form
* †Acacia
* Accipiter
** †Accipiter gentilis
** Living adult (center) and chick (lower right) Accipiter striatus, or sharp-shinned hawks †Accipiter striatus
* Acer
* †Acidomomys – type locality for genus
* †Acrostichum
* †Adilophontes – type locality for genus
* †Adocus
* Aegialia
* Aegolius
** †Aegolius acadicus
** †Aegolius funereus
* Life restoration of the Miocene camel Aepycamelus, or the long-necked camel. Heinrich Harder (1920). †Aepycamelus
* †Aesculus
* †Afairiguana – type locality for genus
** †Afairiguana avius – type locality for species
* Agelaius
** †Agelaius phoeniceus
* †Agnotocastor
** †Agnotocastor galushai – type locality for species
* †Agriochoerus
* †Ailanthus
* †Alastor
* Alces
** †Alces alces
* †Alchornea – or unidentified related form
* †Aletodon
* Aletomeryx †Aletomeryx
* Aleurites
* †Allognathosuchus
* †Allophylus
* Alnus
* †Amentotaxus
* Amia
* †Amitabha – type locality for genus
** †Amitabha urbsinterdictensis – type locality for species
* †Ampelopsis
* †Amphechinus
* Amphiuma
* Amyda
* †Anamirta – or unidentified comparable form
* Anas
** †Anas acuta
** A living Spatula clypeata, or northern shoveler †Anas clypeata
** †Anas crecca
** †Anas platyrhynchos
* †Anconodon
* †Anemia
* †Anniealexandria – type locality for genus
* †Anobium
* †Anolbanolis – type locality for genus
** †Anolbanolis banalis – type locality for species
** †Anolbanolis geminus – type locality for species
* †Anosteira
* †Antherophagus
* Anthonomus
* Antilocapra
** †Antilocapra americana
* Apalone
* †Aphelops
* Aquila
** †Aquila chrysaetos
* Aralia
* Araneus
* †Araucaria
* †Archaeocyon
* †Archaeotherium
* †Archaerhineura – type locality for genus
* †Arctocyon
* Restoration of an Arctodus, or short-faced bear, with a human to scale †Arctodus
** †Arctodus simus
* †Arctostaphylos
* †Arenahippus
* †Aristolochia
* †Armintomys
** †Armintomys tullbergi
* †Artocarpus – tentative report
* †Asarkina
* Asio
** †Asio flammeus
** A living Asio otus, or long-eared owl †Asio otus
* †Asplenium
* †Astronium
* †Athyana
* †Avunculus
* Aythya
** †Aythya collaris
* Azolla
* †Babibasiliscus – type locality for genus
* †Baena
* †Bahndwivici – type locality for genus
** †Bahndwivici ammoskius – type locality for species
* †Baiotomeus
** †Baiotomeus douglassi
** †Baiotomeus lamberti
* Life restoration of the Paleocene-Eocene pantodont mammal Barylambda †Barylambda
* †Bathornis
* †Bathygenys
* †Bathyopsis
* †Batodonoides
** †Batodonoides vanhouteni – type locality for species
* †Batrachosauroides – tentative report
* Bauhinia
* †Beilschmiedia
* †Berosus
* Betula
* Biomphalaria
* Bison
** †Bison bison
* †Bisonalveus – type locality for genus
** †Bisonalveus browni – type locality for species
* †Blechnum
* Bledius
* Fossilized skeleton of the eocene-?Miocene boa snake Boavus †Boavus – type locality for genus
* Boletina
* †Bootherium
** †Bootherium bombifrons
* †Borealosuchus
** †Borealosuchus formidabilis
** †Borealosuchus wilsoni – type locality for species
* †Boverisuchus
** †Boverisuchus vorax
* Restorative portrait of the Miocene oreodont mammal Brachycrus †Brachycrus
* †Brachyhyops
* †Brachyrhynchocyon
* †Brachyuranochampsa – type locality for genus
** †Brachyuranochampsa eversolei – type locality for species
* Bracon
* Branta
** †Branta canadensis
* †Brontops
* †Bryophyte – or unidentified related form
* Bubo
** †Bubo virginianus
* Buteo
** A living Buteo jamaicensis, or red-tailed hawk †Buteo jamaicensis
** †Buteo lagopus
** †Buteo regalis – or unidentified comparable form
* Buteogallus
* †Caedocyon
** †Caedocyon tedfordi – type locality for species
* †Caenopus
* †Caesalpinia
* †Calamospiza
** †Calamospiza melanocorys
* Calidris
** †Calidris melanotos
* †Callomyia
* †Camelops
** †Camelops hesternus – or unidentified comparable form
* †Canarium
* †Canavalia
* Canis
** Modern mounted skeleton of Canis lupus, the grey wolf, to scale with a fossilized skeleton of the Pleistocene wolf Canis dirus, or dire wolf †Canis dirus
** †Canis latrans
** †Canis lupus
* †Cantius
** †Cantius abditus – type locality for species
** †Cantius frugivorus
** †Cantius mckennai
** †Cantius ralstoni
** †Cantius torresi
** †Cantius trigonodus – type locality for species
* Capella
** †Capella gallinago
* Caracara
** †Caracara plancus
* †Cardiospermum
* Carduelis
* †Carpolestes
** Life restoration of the Paleocene primate relative Carpolestes simpsoni †Carpolestes simpsoni – type locality for species
* Carya
* Castanea
* Castor
* †Catopsalis
** †Catopsalis alexanderi
** †Catopsalis calgariensis
* Cedrela
* †Cedrobaena – type locality for genus
* †Celastrus
* Celtis
* †Centrocercus
** †Centrocercus urophasianus
* †Cephalogale
* †Ceratophyllum
** †Ceratophyllum muricatum
* Life restoration of the Paleocene-Eocene crocodilian Ceratosuchus †Ceratosuchus
** †Ceratosuchus burdoshi
* Cercidiphyllum
* †Cercopis
* †Champsosaurus
* Chara
* Charadrius
** †Charadrius montanus
** †Charadrius vociferus
* Charina
* Cheilosia
* †Chelomophrynus – type locality for genus
* †Chilostigma – tentative report
* Chironomus
* Fossilized skeleton of the Eocene turtle Chisternon †Chisternon
* †Cholula
* †Choragus
* †Chordeiles
** †Chordeiles minor
* †Chriacus
** †Chriacus oconostotae
* †Cimolestes
* Cinnamomum
* Circus
** †Circus cyaneus
* Cissus
* †Cixius – tentative report
* Flowers of a living Cladrastis, or yellowwood Cladrastis
* †Cnemidaria
* †Coccothraustes
** †Coccothraustes vespertinus
* Cocculus
* Colaptes
** †Colaptes auratus
* †Colodon
* †Compsemys
* †Coniophis
* †Copecion
* †Copelemur
* †Corizus – tentative report
* Fossilized skull of the Oligocene-Miocene bone-crushing dog Cormocyon †Cormocyon
* Cornus
* Corvus
** †Corvus brachyrhynchos
** †Corvus corax
* †Corylus
* †Coryphodon
* Crataegus
* †Credneria
* Crocodylus
** Fossilized skull of the Eocene crocodilian "Crocodylus" affinis †Crocodylus affinis – type locality for species
* †Cryptocephalus
* Cryptorhynchus
* Cryptotis
* Culex
* Cyclocarya
* †Cynarctoides
** †Cynarctoides acridens
** †Cynarctoides harlowi
** †Cynarctoides luskensis – type locality for species
* †Dalbergia
* †Daphoenictis
* Life restoration of the Miocene bear-dog Daphoenodon †Daphoenodon
* †Daphoenus
** †Daphoenus lambei
* Dasyatis
* †Davidia
* †Dawsonicyon – type locality for genus
* Dendragapus
** †Dendragapus obscurus
* †Dendropanax
* †Dennstaedtia
* †Desmatippus
* †Desmatochoerus
* †Desmocyon
* †Diacodexis
* †Diatryma – type locality for genus
* †Diceratherium
* Dicranomyia
* Dicrostonyx
* †Didymictis
* †Dilophodon
* †Dinictis
* †Dinohyus
* †Diospyros
* †Diplocynodon
* Fossilized skeleton of the Early Cretaceous-Eocene bony fish Diplomystus preserved in the act of swallowing another fish †Diplomystus
** †Diplomystus dentatus
* †Dipoides
* Dipteronia
* Discus
* †Dissacus
* †Distylium
* Dolichopus
* †Dombeya
* †Domnina
* †Drimys
* Dryopteris
* Fossilized shell of the Eocene turtle Echmatemys †Echmatemys
* †Ectocion
* †Ectoconus
* †Ectopistes
** †Ectopistes migratorius
* †Ectopocynus
* †Elaeodendron
* †Enhydrocyon
** †Enhydrocyon basilatus
* Enochrus
* †Entelodon
* Life restoration of a pair of the Eocene uintathere mammal Eobasileus. Charles R. Knight (1890s). †Eobasileus
** †Eobasileus cornutus
* †Eoconodon
** †Eoconodon copanus
* †Eohippus
* †Eorhinophrynus
* †Eostrix
* †Eotitanops
* †Epicaerus
* †Epihippus
* †Equisetum
* Equus
** Restoration of the Pleistocene-Holocene Equus conversidens, or Mexican horse †Equus conversidens
* Eremophila
** †Eremophila alpestris
* Erythrina
* Esox
* †Eucastor
* †Eucommia
* Eugenia
* †Euparius
* Euphagus
** †Euphagus cyanocephalus
* †Eusmilus
* Eutamias
* Fagus
* Falco
** †Falco columbarius
** †Falco mexicanus
** †Falco rusticolus
** †Falco sparverius
* Ficus
* Fossilized skeleton of the Eocene bird Fluvioviridavis †Fluvioviridavis – type locality for genus
* †Fortuna
* †Fraxinus
* †Fulgora
* †Gagadon
** †Gagadon minimonstrum
* †Galecyon
* Galerita
* †Gallinuloides – type locality for genus
* Gastrocopta
* Gerrhonotus – or unidentified comparable form
* Ginkgo
** †Ginkgo adiantoides
* †Gleditsia – or unidentified related form
* Fossilized foliage of the cypress relative Glyptostrobus Glyptostrobus
** †Glyptostrobus europaeus
* †Goniacodon
* Gopherus
* †Gracilocyon
* Grus
** †Grus canadensis
* Gulo
** †Gulo gulo
* †Gymnocladus
* Gyraulus – or unidentified comparable form
* †Habrosaurus
** †Habrosaurus dilatus
* †Hadrianus
* †Hapalodectes
* †Hapalorestes
* †Haplolambda
* †Harpagolestes
* †Helaletes – type locality for genus
* †Helix
* Fossilized skull of the Oligocene lizard Helodermoides †Helodermoides
** †Helodermoides tuberculatus
* †Hemiauchenia
* Hemitelia
* †Heptodon
* †Herpetotherium
** †Herpetotherium knighti
* †Hesperocyon
* †Heteraletes
* Hirundo – or unidentified comparable form
** †Hirundo pyrrhonota
* †Holospira
* †Homogalax
* †Hoplophoneus
* †Hovenia
* †Hutchemys
* Life restoration of the Eocene-Miocene creodont mammal Hyaenodon †Hyaenodon
** †Hyaenodon crucians
** †Hyaenodon horridus
** †Hyaenodon megaloides
** †Hyaenodon montanus
** †Hyaenodon mustelinus
** †Hyaenodon venturae
** †Hyaenodon vetus
* Hydrangea
* Hydrobia – report made of unidentified related form or using admittedly obsolete nomenclature
* Hydrobius
* †Hydrochus
* †Hydromystria
* †Hylobius
* †Hyopsodus
** †Hyopsodus lepidus – type locality for species
* †Hypertragulus
* †Hypisodus
* Life restoration of the Miocene horse Hypohippus. Heinrich Harder (1920). †Hypohippus
* †Hypolagus
* †Hyporhina
* †Hypsiops
* †Hyrachyus
* †Hyracodon
* †Hyracotherium
** †Hyracotherium vasacciense
* †Icaronycteris – type locality for genus
** †Icaronycteris index – type locality for species
* †Indusia
* †Intyrictis
* †Ischyromys
* †Iulus
* Juglans
* †Juncitarsus – type locality for genus
* Junco – or unidentified comparable form
** †Junco hyemalis
* †Kalmia
* †Kalobatippus
* Fossilized skeleton of the Eocene bony fish Knightia †Knightia
** †Knightia eocaena
* Koelreuteria
* †Lagopus
** †Lagopus leucurus – or unidentified comparable form
* †Lambdotherium
* †Lambertocyon
** †Lambertocyon eximius
* Lanius
** †Lanius ludovicianus
* Larus – or unidentified comparable form
* Lathrobium
* †Laurinoxylon
* Laurus
* Leiocephalus
* Lepisosteus
* Restoration of the Oligocene-Miocene oreodont mammal Leptauchenia †Leptauchenia
* †Leptictis
* †Leptocyon
* †Leptolambda
* †Leptomeryx
* †Leptoreodon
* †Leptotragulus
* Lepus
* †Leucosticte
** †Leucosticte arctoa
* †Limnocyon
** †Limnocyon verus – type locality for species
* †Limnofregata – type locality for genus
** †Limnofregata azygosternon – type locality for species
* Lindera
* †Lisserpeton
** †Lisserpeton bairdi
* †Listronotus
* †Lithophysa – type locality for genus
* Life restoration of the Paleocene-Eocene bird Lithornis †Lithornis
** †Lithornis plebius – type locality for species
** †Lithornis promiscuus – type locality for species
* Lygodium
* Lynx
** †Lynx lynx – tentative report
* †Lystra – tentative report
* †Macginitiea
* †Machaeroides
* Macrocranion
* Magnolia
* †Maiorana
* †Mammacyon
* †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
* Marmota
* †Megacerops
* †Megalictis
** †Megalictis ferox
* †Meliosma
* †Meniscotherium
* †Menoceras
* †Menops
* †Mentoclaenodon
* Mergus
** †Mergus merganser
* Life restoration of the Miocene three-toed horse Merychippus †Merychippus
* †Merychyus
* †Merycochoerus
* †Merycodus
* †Merycoides
* †Merycoidodon
* †Mesatirhinus
* †Mesocyon – report made of unidentified related form or using admittedly obsolete nomenclature
* †Mesodma
** †Mesodma formosa
** †Mesodma garfieldensis – or unidentified comparable form
** †Mesodma hensleighi
** †Mesodma pygmaea
* †Mesohippus
* †Mesonyx
** †Mesonyx obtusidens – type locality for species
* †Mesoreodon
* Life restoration of the Eocene pangolin relative Metacheiromys †Metacheiromys
* †Metamynodon
** †Metamynodon planifrons – or unidentified comparable form
* †Metarhinus
* Metasequoia
** †Metasequoia occidentalis
* †Metatomarctus
* †Miacis
* †Michenia
* †Microcosmodon
** †Microcosmodon conus – type locality for species
** †Microcosmodon rosei – type locality for species
* Microphysula – or unidentified comparable form
* †Microsyops
* Microtus
** †Microtus pennsylvanicus
* †Mimetodon
** †Mimetodon churchilli – type locality for species
* †Mimoperadectes
** †Mimoperadectes houdei – type locality for species
* †Miniochoerus
* †Miocyon
* †Miohippus
* Fossilized skeleton of the Eocene perch relative Mioplosus †Mioplosus
* †Miotapirus
** †Miotapirus harrisonensis – type locality for species
* †Miotylopus
* †Miracinonyx
** †Miracinonyx studeri
* †Mithrandir
* Mnemosyne
* †Monosaulax
* †Moropus
* Morus
* Mustela
** †Mustela nigripes
* Myrica
* Myrmica
* †Nanotragulus
* †Neanis
* †Nelumbo
* †Neocathartes
** †Neocathartes grallator
* †Neoliotomus
** †Neoliotomus conventus
** †Neoliotomus ultimus
* Mounted fossilized skeleton of the Miocene Neophrontops Neophrontops
** †Neophrontops americanus
* †Neoplagiaulax
** †Neoplagiaulax grangeri – tentative report
** †Neoplagiaulax hunteri
** †Neoplagiaulax jepi – type locality for species
** †Neoplagiaulax mckennai – type locality for species
** †Neoplagiaulax nelsoni
* Neotoma
* †Nexuotapirus
* †Niglarodon
* †Notharctus
** †Notharctus robustior
** †Notharctus tenebrosus – type locality for species
** †Notharctus venticolus
* Fossilized skeleton of the Late Cretaceous-Eocene beaked salmon relative Notogoneus †Notogoneus
* †Nototamias – or unidentified comparable form
* †Nucifraga
** †Nucifraga columbiana
* Numenius
** †Numenius americanus
** †Numenius borealis
* †Nyctea
** †Nyctea scandiaca
* †Nyssa
* Ochotona
** †Ochotona princeps
* Ocotea
* †Odaxosaurus
** †Odaxosaurus piger
* Ondatra
* †Onoclea
* Restoration of the Eocene bat Onychonycteris †Onychonycteris – type locality for genus
** †Onychonycteris finneyi – type locality for species
* †Oodectes
* Ophryastes
* †Opisthotriton
* Oreamnos
* †Oreodontoides
* Oreohelix
* †Oreopanax
* †Ormiscus
* Fossilized skeleton of the Eocene horse Orohippus †Orohippus
* †Orthogenysuchus – type locality for genus
** †Orthogenysuchus olseni – type locality for species
* †Osbornodon
* †Osmanthus
* †Osmunda
* †Otarocyon
* †Otiorhynchus
* †Ototriton – type locality for genus
** †Ototriton solidus – type locality for species
* Ovis
** †Ovis canadensis
* †Oxyacodon
* †Oxyaena
* Life restoration of a pair of the Oligocene-Miocene camel Oxydactylus. Robert Bruce Horsfall (1913). †Oxydactylus
* †Pachyaena
* Pachycondyla
* †Palaearctonyx
* †Palaeogale
* †Palaeolagus
* †Palaeonictis
* †Palaeoryctes
* †Palaeosinopa
* †Palaeosyops
* †Palatobaena – type locality for genus
* †Paleoamphiuma – type locality for genus
* Paliurus
* Panthera
** A living Panthera leo, or lion †Panthera leo
* †Pantolambda
* †Paracathartes
** †Paracathartes howardae
* †Paracynarctus
* †Paraenhydrocyon
** †Paraenhydrocyon josephi
* †Parahippus
* †Paramys
* †Parandrita
* †Paratomarctus
* †Paratylopus
* †Parectypodus
** †Parectypodus lunatus
** †Parectypodus sinclairi
** †Parectypodus sylviae
* †Parictis
* †Parvitragulus
* Life restoration of the Eocene creodont mammal Patriofelis. Charles R. Knight (1896). †Patriofelis
** †Patriofelis ferox – type locality for species
* †Patriomanis
* †Peltosaurus
* †Pelycodus
* †Pentacosmodon
** †Pentacosmodon pronus – type locality for species
* †Peratherium
* Perognathus
* Peromyscus
* Persea
* †Phalaenoptilus
** †Phalaenoptilus nuttallii
* Fossilized skeleton of the Paleocene-Eocene arowana relative Phareodus †Phareodus
** †Phareodus encaustus
** †Phareodus testis
* †Phenacocoelus
* †Phenacodontid
* †Phenacodus
* Phenacomys
* †Philodendron – or unidentified related form
* †Philotrox
** †Philotrox condoni
* Illustration of a fossilized skull in multiple views of the Oligocene-Miocene bone-crushing dog Phlaocyon †Phlaocyon
** †Phlaocyon annectens
** †Phlaocyon minor
* †Phoebe
* Phragmites – tentative report
* Phyllobius
* Physa
* Pica
** †Pica pica
* †Piceoerpeton – type locality for genus
* Pinus
* Pipilo
** †Pipilo chlorurus
* †Plagiomene
* †Planera
* †Planetetherium
** †Planetetherium mirabile
* †Plastomenoides
* Platanus
* Platycarya
* Platynus
* Plecia
* Life restoration of the Paleocene-Eocene primate Plesiadapis †Plesiadapis
** †Plesiadapis cookei
* †Poabromylus
* †Poebrodon
* †Poebrotherium
* Polygyra
* Populus
* Porzana
** †Porzana carolina
* †Potamogeton
* Life restoration of the Paleocene-Eocene waterfowl Presbyornis †Presbyornis
* †Primobucco
* †Princetonia
* †Priscacara
* †Pristichampsus
* †Probathyopsis
* †Procaimanoidea
* †Procamelus
* †Prochetodon
** †Prochetodon cavus – type locality for species
** †Prochetodon foxi
** †Prochetodon taxus – type locality for species
* †Procynodictis
* †Prolimnocyon
* †Promartes
* †Promerycochoerus
* †Proscalops
* Life restoration of a female (left) and male of the Oligocene-Miocene even-toed ungulate Protoceras. Charles R. Knight (1896). †Protoceras
* †Protochelydra
** †Protochelydra zangerli – or unidentified comparable form
* †Protohippus
* †Protolabis
* †Protomarctus
* †Protorohippus
* †Protostrix
* †Protungulatum
** †Protungulatum donnae
* †Protylopus
* Prunus
* †Pseudaelurus
* †Pseudhipparion
* †Pseudocrypturus – type locality for genus
** †Pseudocrypturus cercanaxius – type locality for species
* †Pseudolabis
* †Pseudoprotoceras
* †Psilota
* †Psittacotherium
* Ptelea
* Pteris – or unidentified related form
* Pterocarya
* Fossilized skeleton of the Paleocene multituberculate mammal Ptilodus †Ptilodus
** †Ptilodus fractus
** †Ptilodus gnomus
** †Ptilodus kummae
** †Ptilodus mediaevus
** †Ptilodus montanus – or unidentified comparable form
** †Ptilodus tsosiensis – or unidentified comparable form
** †Ptilodus wyomingensis – type locality for species
* Puma
** †Puma concolor
* Pupilla – or unidentified comparable form
* †Pyramidula
* †Pyrocyon
* Quercus
* Quiscalus – or unidentified comparable form
* Life restoration of the Miocene-Pliocene pronghorn Ramoceros and Cosoryx. Robert Bruce Horsfall (1913). †Ramoceros
* †Raphictis
* †Rhamnus
* Rhineura – type locality for genus
* Rhinoclemmys – report made of unidentified related form or using admittedly obsolete nomenclature
* Rhus
* †Rhyssa
* †Robinia
* Rosa
* Sabal
* †Saccoloma
* Salix
* †Salpinctes – or unidentified comparable form
** †Salpinctes obsoletus
* †Salvinia
* Fossilized skeleton of the Eocene monitor lizard Saniwa †Saniwa – type locality for genus
** †Saniwa ensidens – type locality for species
* †Sapindus
* Sassafras
* †Scapherpeton
* †Schoepfia
* Sciara
* †Sciophila
* Sequoia
* †Sespia
* †Shoshonius
** †Shoshonius bowni
** †Shoshonius cooperi
* †Sialia
* †Sifrhippus
* †Simoedosaurus
* †Sinomenium – or unidentified related form
* Fossilized skeleton of the Eocene-Oligocene creodont mammal Sinopa †Sinopa
* Siren
** †Siren dunni – type locality for species
* Sitona
* Sloanea – or unidentified related form
* †Smilax
* †Smilodectes
** †Smilodectes gracilis – type locality for species
** †Smilodectes mcgrewi – type locality for species
* Sorex
** †Sorex hoyi
* †Sparganium
* †Spathorhynchus – type locality for genus
** †Spathorhynchus fossorium – type locality for species
** †Spathorhynchus natronicus
* Spermophilus
** †Spermophilus variegatus
* †Sphenocoelus
* Spirodela
* †Spiza
** †Spiza americana
* Stagnicola
* †Stegobium
* †Steneofiber
* Life restoration of the Oligocene-Miocene camel Stenomylus †Stenomylus
** †Stenomylus gracilis
** †Stenomylus hitchcocki
** †Stenomylus keelinensis
* Sterculia
* †Stillingia
* Sturnella
** †Sturnella neglecta
* †Stygimys
** †Stygimys kuszmauli
* †Stylemys
* †Stylinodon
* †Styrax
* †Subhyracodon
* Surnia
** †Surnia ulula
* †Suzanniwana – type locality for genus
** †Suzanniwana patriciana – type locality for species
** †Suzanniwana revenanta – type locality for species
* †Swartzia
* Sylvilagus
* Symplocos
* Synaptomys
* Life restoration of the Miocene protoceratid mammal Syndyoceras †Syndyoceras
** †Syndyoceras cooki
* Syrphus
* Tachycineta – or unidentified comparable form
** †Tachycineta bicolor
* †Taeniolabis
** †Taeniolabis taoensis
* Tamias
* †Tanymykter
* †Tapocyon
* †Tarka
* Taxidea
** †Taxidea taxus
* Taxodium
* †Taxonus
* †Teilhardina
* Restoration of the Miocene-Pliocene rhinoceros Teleoceras †Teleoceras
* †Telmatherium
* †Temnocyon
* †Tetraclaenodon
* Thelypteris
* †Thouinia
* †Thuja
* Tilia
* Tipula
* Life restoration of the Paleocene pantodont mammal Titanoides †Titanoides
** †Titanoides gidleyi – type locality for species
** †Titanoides major
** †Titanoides nanus – type locality for species
** †Titanoides primaevus
* †Titanomyrma
** †Titanomyrma lubei – type locality for species
* †Trapa
* †Trigenicus
* †Trigonias
* Trionyx
* †Tritemnodon
* †Tritoma
* †Triumfetta
* †Trogosus
* †Tropisternus
* †Trypodendron
* †Tsoabichi – type locality for genus
** †Tsoabichi greenriverensis – type locality for species
* Turdus – or unidentified comparable form
** †Turdus migratorius
* †Tylocephalonyx
* Tympanuchus
** †Tympanuchus phasianellus
* Typha – or unidentified related form
* †Tytthaena
* †Uintacyon
* Life restoration of the Eocene mammal Uintatherium †Uintatherium – type locality for genus
** †Uintatherium anceps – type locality for species
* Ulmus
* Unio
* Ursus
** †Ursus arctos
* †Ustatochoerus
* †Valenia
* †Valenopsalis
* †Vassacyon
* †Vauquelinia
* Leaves and fruit of a living Viburnum. †Viburnum
* †Vinea – or unidentified comparable form
* Vitis
* †Viverravus
* Viviparus
* †Vulpavus
* Vulpes
** †Vulpes vulpes
* †Woodwardia
* †Xanclomys
** †Xanclomys mcgrewi – type locality for species
* †Xyronomys
* Life restoration of the Miocene bear dog Ysengrinia †Ysengrinia
* †Zamia
* Zelkova
* Zenaida
* Zizyphus
* †Zodiolestes
* Zonotrichia
** †Zonotrichia albicollis