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

Main article: List of the Mesozoic life of Oregon

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

Main article: List of the Cenozoic life of Oregon

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

References

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database" . Retrieved 7 August 2017.