# List of the prehistoric life of Oregon

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

## Precambrian

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

## Paleozoic

* †Acteonina
** †Acteonina permiana – type locality for species
* †Albaillella
** †Albaillella asymmetrica
** †Albaillella sinuata
** †Albaillella triangularis – or unidentified comparable form
* †Alexenia – tentative report
** †Alexenia occidentalis – type locality for species
** †Alexenia subquadrata – type locality for species
* †Anidanthus
** †Anidanthus minor – type locality for species
* †Antiquatonia
** †Antiquatonia cooperi – type locality for species
** †Antiquatonia reticulata – type locality for species
* †Arceodomus
** †Arceodomus sphairikos – type locality for species
* †Arcochiton
** †Arcochiton soccus – type locality for species
* †Bajkuria
** †Bajkuria rostrata
* †Bathymyonia
** †Bathymyonia elongata – type locality for species
* †Calliprotonia
** †Calliprotonia inexpectatum – type locality for species
* †Changmeia
** †Changmeia bigflatensis – type locality for species
** †Changmeia bostwicki – type locality for species
* †Chauliochiton
* †Chonetes
** †Chonetes alatus – or unidentified related form
** †Chonetes pygmoideus – type locality for species
* †Chonetinella
* †Cleiothyridina
** †Cleiothyridina attenuata – type locality for species
* †Composita
* †Corwenia – tentative report
** †Corwenia ashwillensis – type locality for species
* †Crurithyris
* Fossil of the Carboniferous-Permian trilobit Cummingella †Cummingella
* †Cystolonsdaleia
** †Cystolonsdaleia berthiaumi – type locality for species
* †Deflandrella
** †Deflandrella manica
* †Derbyia
* †Diadeloplax
** †Diadeloplax apiculatus – type locality for species
* †Dielasma
** †Dielasma brevicostatum – type locality for species
** †Dielasma rectimarginatum – type locality for species
** †Dielasma truncatum – type locality for species
* †Entactinia
** †Entactinia modesta
* †Entactinosphaera
** †Entactinosphaera cimelia – or unidentified related form
* †Eoparafusulina
* †Follicucullus
** †Follicucullus charveti
** †Follicucullus monacanthus
** †Follicucullus scholasticus
** †Follicucullus ventricosus
* †Gryphochiton
** †Gryphochiton planoplata
* †Haplentactinia – tentative report
** †Haplentactinia ichikawai
* †Hegleria
** †Hegleria mammilla
* †Heritschioides – tentative report
* †Himathyris
** †Himathyris gerardi
* †Homeochiton – type locality for genus
** †Homeochiton triangularis – type locality for species
* †Hustedia
* †Ishigaum
** †Ishigaum trifustis
* †Kashiwara
** †Kashiwara magna
* †Kleopatrina
** †Kleopatrina magnifica – or unidentified comparable form
* †Kochiproductus
** †Kochiproductus porrectus – or unidentified comparable form
** †Kochiproductus transversus – type locality for species
* †Krotovia
** †Krotovia barenzi – or unidentified related form
** †Krotovia oregonensis – type locality for species
** †Krotovia parva – type locality for species
** †Krotovia pustulata
* †Kuvelousia
** †Kuvelousia leptosa – type locality for species
* †Latentibifistula
** †Latentibifistula asperspongiosa – or unidentified related form
* †Latentifistula
** †Latentifistula crux – or unidentified related form
** †Latentifistula patagilaterala
** †Latentifistula texana
* †Leptodus – tentative report
* †Linoproductus
** †Linoproductus lutkewitschi – or unidentified comparable form
* †Marginifera – tentative report
** †Marginifera brevisulcata – type locality for species
** †Marginifera costellata – type locality for species
** †Marginifera multicostellata – type locality for species
** †Marginifera profundosulcata – type locality for species
* †Martinia
** †Martinia berthiaumei – type locality for species
* †Meekella
* †Monodiexodina – tentative report
* †Nazarovella
** †Nazarovella gracilis
* †Neoalbaillella
** †Neoalbaillella pseudogrypus
* Fossilized shell of the Carboniferous-Permian brachiopod Neospirifer †Neospirifer
* †Petalaxis
** †Petalaxis occidentalis – type locality for species
* †Polydiexodina
** †Polydiexodina oregonensis
* †Praedeflandrella
* †Probolionia
** †Probolionia elongata – type locality for species
** †Probolionia posteroreticulata – type locality for species
* †Proboscidella – tentative report
** †Proboscidella carinata – type locality for species
* †Protowentzelella
* †Pseudoalbaillella
** †Pseudoalbaillella fusiformis
** †Pseudoalbaillella globosa – or unidentified related form
** †Pseudoalbaillella lomentaria – or unidentified comparable form
** †Pseudoalbaillella longicornis – or unidentified related form
** †Pseudoalbaillella scalprata
* †Pseudotormentus
** †Pseudotormentus kamigoriensis
* †Pterochiton
* †Punctospirifer
* †Quinqueremis
** †Quinqueremis robusta – or unidentified related form
* †Rhipidomella
* †Rhynchopora
** †Rhynchopora magna – type locality for species
* †Rostranteris
** †Rostranteris merriami – type locality for species
** †Rostranteris sulcatum – type locality for species
* †Schwagerina
* Fossil of the Carboniferous colonial rugose coral Siphonodendron †Siphonodendron – tentative report
* †Spiriferella
** †Spiriferella pseudodraschei – type locality for species
* †Spiriferellina
** †Spiriferellina pauciplicata – type locality for species
* †Stenoscisma
** †Stenoscisma americanum – type locality for species
** †Stenoscisma biplicatoideum – type locality for species
** †Stenoscisma mutabile
** †Stenoscisma mutabilis
** †Stenoscisma plicatum – or unidentified comparable form
* †Stigmosphaerostylus
** †Stigmosphaerostylus itsukaichiensis
* †Tiramnia
** †Tiramnia semiglobosa – or unidentified related form
* †Triplanospongos
** †Triplanospongos dekkasensis
* †Waagenoconcha
** †Waagenoconcha parvispinosa – type locality for species
* †Wellerella
** †Wellerella multiplicata – type locality for species
* †Wilsonastraea
** †Wilsonastraea ochocoensis – type locality for species
* †Yakovlevia
** †Yakovlevia brevisulcata
** †Yakovlevia transversa – type locality for species
* †Yokoyamaella – tentative report
** †Yokoyamaella oregonensis – type locality for species

## Mesozoic
### Selected Mesozoic taxa of Oregon

* †Acanthodiscus
* Fossilized shells of the Early-Late Cretaceous marine bivalve Actinoceramus †Actinoceramus
* †Anahamulina
* †Anatropites
* †Arcestes
* †Arietoceltites
* Astarte
* †Bennettazhia
** †Bennettazhia oregonensis – type locality for species
* Cadulus
* †Calycoceras
* Cardinia
* Life restoration of the Late Triassic-Middle Jurassic nautiloid cephalopod Cenoceras †Cenoceras
* Chlamys
* †Cleoniceras – tentative report
* †Corum
* †Crioceratites
* Dentalium
* †Gervillia
* †Gryphaea
** †Gryphaea arcuataeformis
* †Hoploparia
* †Hypophylloceras
* Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size †Inoceramus
* †Kilianella
* †Lantus
* Lima
* †Lissodus
* † Loffa
* Lopha
* †Lucina
* †Lyelliceras
* †Lytoceras
* †Mantelliceras
* †Metapolygnathus
* Milax
* †Modiolus
* Fossilized shell of the Jurassic-Cretaceous marine bivalve Myophorella †Myophorella
** †Myophorella argo – or unidentified comparable form
* †Neogondolella
* †Nerinea
* †Olcostephanus
* †Ophthalmidium
* Ostrea
* †Otoscaphites
* †Pachus – tentative report
* †Pachydiscus
* †Peronidella
* Pholadomya
* †Phylloceras
* †Phyllopachyceras
* †Plagiostoma – tentative report
* †Platymya
* Plicatula
* †Radium – type locality for genus
* †Scalarites
* †Scaphites
* Life restoration of three species of the Middle-Late Triassic ichthyosaur genus Shastasaurus †Shastasaurus
** †Shastasaurus pacificus – or unidentified comparable form
* †Spitidiscus
* †Thamnasteria
* †Tragodesmoceras
* †Trigonia
** †Trigonia montanaensis
* Turritella
* †Tutcheria
* Venericardia
* †Vermiceras
* †Xiphotheca
* †Zoneait – type locality for genus

## Cenozoic
### Selected Cenozoic taxa of Oregon

* Abies
* †Acamptogenotia
* Acanthocardia
* Abies
* †Acamptogenotia
* Acanthocardia
* Acer
* Acmaea
* Mounted fossilized skeleton of the Miocene horse Acritohippus †Acritohippus
** †Acritohippus isonesus
* Acteon
* †Actinidia
** †Actinidia oregonensis
* Admete
* Aechmophorus
** †Aechmophorus occidentalis
* †Aesculus
* Life restoration of the Oligocene baleen whale Aetiocetus †Aetiocetus – type locality for genus
** †Aetiocetus cotylalveus – type locality for species
* Aforia
* Agelaius – tentative report
* †Agriochoerus
* Aix
** †Aix sponsa
* Alangium
* Alnus
** †Alnus heterodonta
* Life restoration of the Miocene elephant relative Amebelodon. Margret Flinsch (1932). †Amebelodon
* Amelanchier
* Ammospermophilus
* Ampelocissus
* †Amphicyon
** †Amphicyon frendens
** †Amphicyon galushai – or unidentified comparable form
* Amphissa
* †Ampullina
* †Anabernicula
* Anadara
* †Anamirta
* Anas
** †Anas acuta
** †Anas americana
** †Anas boschas
** †Anas carolinensis
** A living Spatula clypeata, or northern shoveler †Anas clypeata
** †Anas cyanoptera
** †Anas discors
** †Anas platyrhynchos
* Ancilla
* Anona
* Anser
** †Anser albifrons
** †Anser condoni – type locality for species
* Antillophos
* Antilocapra
** †Antilocapra americana – or unidentified comparable form
* Aphananthe
* †Aphelops
* Aquila
** †Aquila chrysaetos
* Arbacia
* †Archaeocyon
* †Archaeohippus
* †Archaeotherium
* Architectonica
* †Arctodus
* Ardea
** †Ardea herodias
* Argobuccinum
* †Ascosphaera
* Astraea
* Astreopora
* Astropecten
* †Aturia
* †Aucuba
* Aythya
** †Aythya marila
* Balaena
* Balaenoptera
** Illustration of a living Balaenoptera acutorostrata, or common minke whale †Balaenoptera acutorostrata – or unidentified comparable form
* Balanophyllia
** †Balanophyllia elegans
* Balanus
* Bartramia
* †Basirepomys
* Bathybembix
* Bathytoma
* Bela
* Betula
* Bittium
* †Bonellitia
* Boreotrophon
** †Boreotrophon stuarti
* Restoration of two of the Miocene-Pliocene bone-crushing dog genus Borophagus preying on a camel. Jay Matternes (1964). †Borophagus
** †Borophagus pugnator
** †Borophagus secundus – or unidentified comparable form
* Botaurus
** †Botaurus lentiginosus
* Brachidontes
* Branta
** †Branta bernicla
** †Branta canadensis
* Bubo
** †Bubo virginianus
* Buccinum
** †Buccinum strigillatum
* Bullia
* †Bumelia – tentative report
* Cadulus
* Calliostoma
* Callista
* Callorhinus – tentative report
* †Calocedrus
* †Calycocarpum
* Calyptraea
* Life restoration of the Pliocene-Holocene camel Camelops †Camelops
** †Camelops hesternus
* Cancellaria
* Canis
** †Canis dirus – or unidentified comparable form
** †Canis edwardii
** †Canis latrans
** †Canis lupus – or unidentified comparable form
* †Carpocyon
* Carya
* Caryophyllia
* Castanea
* Castanopsis
* A living Castor canadensis, or North American beaver Castor
* †Catalpa
* Cedrela
* Celtis
* †Centrocercus
** †Centrocercus urophasianus
* Cercidiphyllum
* Cercis
* Cerithiopsis
* †Charitonetta
** †Charitonetta albeola
* Chen
** †Chen rossii
* Life restoration of the Pleistocene-Holocene Chendytes, or Law's diving-goose †Chendytes
* Chione
* Chlidonias
** †Chlidonias nigra
* Chlorostoma
* †Choerodon
* †Chrysodomus
* Circus
* Cladrastis
* Clangula
** †Clangula hyemalis
* Cleyera
* Clinocardium
** †Clinocardium nuttallii
* Cochliolepis – tentative report
* Colaptes
* †Colodon
* Columbella
* Shells in differing orientations of Colus whelk sea snails Colus – tentative report
* Comitas
** †Comitas monile
** †Comitas oregonensis
** †Comitas spencerensis
* Comptonia
* Conomitra
* Conus
* †Cophocetus – type locality for genus
* Corbula
* †Cormocyon
* Cornus
** †Cornus clarnensis
* †Cornwallius
* Corvus
** †Corvus corax
* †Coryloides
** †Coryloides hancockii
* Fossilized fruit of a Craigia plant Craigia
* Crataegus
* Crenella
* Crepidula
** †Crepidula adunca
** †Crepidula grandis – or unidentified comparable form
* Cryptonatica
** †Cryptonatica affinis
* Cryptotis
* †Cunninghamia
* Cyclocardia
* Cygnus
** †Cygnus paloregonus
* Cymatium
* Underside of a fossilized cranium of the Oligocene-Miocene bone-crushing dog Cynarctoides †Cynarctoides
** †Cynarctoides lemur
** †Cynarctoides luskensis – or unidentified comparable form
* †Cynelos
* †Daeodon
** †Dafila acuta
* †Daphoenodon
* †Daphoenus
** †Daphoenus socialis
* Mounted fossilized skeleton of the Eocene pseudo-toothed bird Dasornis †Dasornis – or unidentified related form
* Decodon
* Dendragapus – type locality for genus
* Dentalium
* †Desmatippus
* †Desmatochoerus
* †Desmatophoca
** †Desmatophoca oregonensis
* †Desmocyon
* †Desmostylus
** †Desmostylus hesperus – type locality for species
* †Diceratherium
* †Dilophodelphis – type locality for genus
* †Dinaelurus
* Life restoration of the Eocene-Miocene false saber-toothed cat Dinictis. Robert Bruce Horsfall (1913). †Dinictis
** †Dinictis cyclops
* †Diploporus
** †Diploporus torreyoides
* †Dipoides
* †Diprionomys
* Dipteronia
* Discinisca
* Dosinia
* †Dromomeryx
** †Dromomeryx borealis
* †Dyticonastis – type locality for genus
** †Dyticonastis rensbergeri – type locality for species
* Echinophoria
* †Ekgmowechashala
* †Emmenopterys
* Life restoration of the Oligocene-Miocene Enaliarctos and the toothed whale Macrodelphinus (background) †Enaliarctos
** †Enaliarctos barnesi – type locality for species
** †Enaliarctos emlongi – type locality for species
** †Enaliarctos mitchelli
** †Enaliarctos tedfordi – type locality for species
* Engelhardtia
* Enhydra
* †Enhydrocyon
* †Ensete
* †Epicyon
** †Epicyon haydeni
* †Epihippus
* Epitonium
* †Eporeodon
* †Equisetum
* Equus
** †Erismatura jamaicensis
* Erolia
* Ervilia – tentative report
* †Eucastor
* Fossilized skeleton of the Miocene-Pliocene coyote-like canine Eucyon †Eucyon
** †Eucyon davisi
* †Euoplocyon
* Euphagus
** †Euphagus cyanocephalus
* Euspira
** †Euspira pallida
* †Eutrephoceras
* Exbucklandia
* †Exilia
* Fagus
* Falco
* Ficus
* Fimbria
* Flabellum
* †Floridaceras
* Fossilized flower of the Eocene-Oligocene mallow relative Florissantia †Florissantia
* Fothergilla
* Fraxinus
* Fulgoraria
* Fulgurofusus
* Fulica
** Fulica americana
* Fusinus
* †Gaillardia
* Gari – tentative report
* Gemmula
* †Gentilicamelus
* Glycymeris
* †Goedertius – type locality for genus
* Mounted fossilized skeleton of the Miocene-Pleistocene elephant relative Gomphotherium †Gomphotherium
* Granula
* Gyrineum – report made of unidentified related form or using admittedly obsolete nomenclature
* †Hadrianus
* Halesia
* Haliaeetus
** †Haliaeetus leucocephalus
* †Haplohippus
* †Hemiauchenia – tentative report
* Heptranchias
** †Heptranchias howelli
* Life restoration of the Eocene-Miocene mammal Herpetotherium †Herpetotherium
* Hiatella
* Himantopus
** †Himantopus mexicanus
* †Hippotherium
* †Hoplophoneus
* †Hovenia
* Hydrangea
* †Hypertragulus
* †Hypohippus
* †Hypolagus
* †Hypsidoris
* †Hypsiops
* †Hyrachyus
* Fossilized skull of the Miocene bear Indarctos †Indarctos
* Isurus
** †Isurus planus
* Juglans
* †Kalobatippus
* †Kardiasperma
** †Kardiasperma parvum
* Kellia
* †Keteleeria
* †Kolponomos
** †Kolponomos newportensis – type locality for species
* Lacuna
** †Lacuna vincta
* Larus
** †Larus argentatus
** †Larus californicus
** †Larus philadelphia
* Lepeta
* Illustration of a fossilized skull of the Oligocene-Miocene dog Leptocyon †Leptocyon
* Lepus
* Leukoma
** †Leukoma staminea
* Limnodromus
** †Limnodromus griseus – tentative report
* Lindera
* Liquidambar
* †Lithocarpus
* Littorina
* Lophodytes
** †Lophodytes cucullatus
* †Lophortyx
* Lynx
* Lytechinus
* Fossilized cranium of the Miocene-Pleistocene saber-toothed cat Machairodus †Machairodus
* †Machilus
* Macoma
** †Macoma nasuta
* Macrocallista
* Magnolia
* Mahonia
* †Malus – or unidentified comparable form
* †Mammut
** †Mammut furlongi – type locality for species
* †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 – tentative report
* Marcia
* Margarites
* Martes
* Martesia
* Mastixia
* Megachasma
* †Megalonyx
* †Megapaloelodus
* †Megatylopus
* Melanitta
** †Melanitta deglandi
** †Melanitta perspicillata
* †Meliosma
** †Meliosma beusekomii
* †Menispermum – or unidentified comparable form
* Mergus
** †Mergus merganser
** †Mergus serrator
* Restoration of the Miocene three-toed horse Merychippus †Merychippus
* †Merychyus
* †Merycochoerus
* †Merycoides
* †Merycoidodon
* †Mesocyon
* †Mesohippus
* †Metalopex
* Metasequoia
** †Metasequoia occidentalis
* †Microphallus
* Microtus
** †Microtus montanus
* †Miohippus
* †Miotapirus
* Modiolus
** †Modiolus modiolus
* Molothrus
** †Molothrus ater – tentative report
* †Monosaulax
* †Moropus
* Mulinia
* Mustela
* †Mya
** †Mya truncata
* Myotis – or unidentified comparable form
* Mytilus
** †Mytilus californianus
** †Mytilus edulis
* †Nanotragulus – or unidentified comparable form
* Nassarius
* Natica
* †Nautilus
* Nectandra
* †Neohipparion
* Mounted fossilized skeleton of the Miocene Neophrontops Neophrontops
* Neotamias
* †Neurotrichus – tentative report
* Neverita
* †Nexuotapirus
* Nucella
** †Nucella lamellosa
* Nucula
* Numenius
** †Numenius americanus – tentative report
* †Nuphar
* †Nyssa
** †Nyssa spatulata
* A living Ochotona, or pika Ochotona
** †Ochotona spanglei – type locality for species
* Ocotea
* Olar
* †Oligobunis
* Olivella
** †Olivella biplicata
** †Olivella pedroana
* Ondatra
* Opalia
* †Oreodontoides
* †Osbornodon
* †Osmunda
* Ostrea
** †Ostrea lurida – or unidentified comparable form
* Ostrya
* Life restoration of the Oligocene-Miocene beaver Palaeocastor †Palaeocastor
* †Palaeolagus
* †Paleopanax
** †Paleopanax oregonensis
* Paliurus
* Pandora
* Panopea
** †Panopea abrupta
* Panthera
** †Panthera onca – or unidentified comparable form
* †Paradaphoenus
* †Paraenhydrocyon
** †Paraenhydrocyon josephi
* †Parahippus
** †Parahippus leonensis – or unidentified related form
* Fossilized skeleton of the Pliocene-Pleistocene ground sloth Paramylodon †Paramylodon
** †Paramylodon harlani
* †Paratomarctus
* †Paratylopus
* †Paronychomys
* †Paroreodon
* †Parrotia
* †Parthenocissus
* Passalus
* †Patriofelis
** †Patriofelis ferox
* Pekania
* Life restoration of the Oligocene-Pleistocene false-toothed bird Pelagornis †Pelagornis
* Pelecanus
** †Pelecanus erythrorhynchos
** †Pelecanus erythrorhynchus – tentative report
* Perognathus
* Peromyscus
* †Perse
* Phalacrocorax
** †Phalacrocorax auritus – tentative report
* Phalaropus
** †Phalaropus lobatus
* Phalium
* Phanerolepida
* †Philotrox
** †Philotrox condoni
* †Phlaocyon
** †Phlaocyon latidens
* Phoca
** †Phoca vitulina – or unidentified comparable form
* Two Phoenicopterus, or flamingos Phoenicopterus
** †Phoenicopterus copei – type locality for species
* Pinus
* Pitar
* †Plagiolophus
* Platanus
* †Platygonus
* †Pleiolama
* †Plesiocolopirus
* †Plesiogulo
* †Pliocyon – or unidentified comparable form
* Fossilized skull of the Miocene horse Pliohippus †Pliohippus
* †Plionarctos
* Podiceps
** †Podiceps auritus – tentative report
* Podilymbus
** †Podilymbus podiceps
** †Pododesmus macrochisma
* †Pogonodon
* Polinices
* †Polypodium – or unidentified comparable form
* †Pontolis – type locality for genus
** †Pontolis magnus – type locality for species
* †Potamogeton
* †Pristichampsus
* †Procamelus
* †Promartes – or unidentified comparable form
* †Promerycochoerus
* Propeamussium
* Life restoration of the Eocene brontothere mammal Protitanops †Protitanops
* †Protolabis – or unidentified comparable form
* Protothaca
* Prunus
* †Psephophorus – tentative report
* †Pseudaelurus
* †Pseudotsuga
* Pteris
* Pterocarya
* †Pteronarctos – type locality for genus
* Puncturella
** †Puncturella galeata
* Purpura
* Pyramidella – tentative report
* Pyrenacantha
* Fruit of a living Pyrus, or pear tree †Pyrus
* Quercus
* Querquedula
* Raja
* Rallus
** †Rallus limicola
* Recurvirostra
** †Recurvirostra americana
* Retusa
* Rhabdus
* †Rhizocyon
* Rhus
** †Rhus rooseae
* †Ribes
* Rimella
* Rosa
* A living member of Rubus, the genus including blackberries (pictured) and raspberries Rubus
* Sabal
* †Sabia
* Salix
* Sanguinolaria
* Sassia
* Saxidomus
** †Saxidomus gigantea
* Scapanus
** †Scapanus latimanus
* Scaphander
* †Schisandra
* Schizaster
* Sciurus
* †Scutella
* Semele
* Sequoia
** †Sequoia affinis
* Siliqua
** †Siliqua patula
* †Simocetus – type locality for genus
* Reconstruction of a fossilized skull and restorative portrait of the Miocene-Pliocene red panda relative Simocyon †Simocyon
* Sinum
* Solariella
* Solemya
* Solen
* †Somatochlora
* Spermophilus
* Spirotropis
* Spisula
* Spizaetus
* †Steneofiber
* Stercorarius
* Sterna
** †Sterna elegans – tentative report
** †Sterna forsteri
* Fossilized skeleton of the Miocene weasel Sthenictis Sthenictis
* Strongylocentrotus
* Sturnella
* †Suavodrillia
* †Subhyracodon
* Sveltella
* Symplocos
* Tapirus
** †Tapirus californicus – or unidentified comparable form
* Tapiscia
* Taranis
* Taxidea
* †Taxus
** †Taxus masonii
* Tegula
* Restoration of the Miocene-Pliocene rhinoceros Teleoceras †Teleoceras
* Tellina
* †Temnocyon
* †Tephrocyon
* Terminalia
* †Tetraclinis
* Thais
* Thesbia – report made of unidentified related form or using admittedly obsolete nomenclature
* Thomomys
** †Thomomys townsendii
* Thracia
* Fossilized skull of the Miocene oreodont mammal Ticholeptus †Ticholeptus
* Tilia
* †Torreya
** †Torreya clarnensis
* Totanus
* †Toxicodendron
* Trema
* Tresus
* Trichotropis
* Trochita
* Shell of a Trophon murex snail Trophon
* †Tsuga
* Turricula
* Turris
* Turritella
* †Tylocephalonyx
* Tympanuchus
** †Tympanuchus pallidicinctus
* Ulmus
* †Ursavus
* Venericardia
* †Viburnum
* Vitis
* Vulpes
* Xema
* Yoldia
** †Yoldia cooperii – or unidentified comparable form
* Zalophus
** A living Zalophus californianus, or California sea lion †Zalophus californianus
* Zelkova