List of the Cenozoic life of Washington (state)
This list of the Cenozoic life of Washington contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Washington and are between 66 million and 10,000 years of age.
A
- Abdiunguis
- Abies
- Abies milleri - type locality for the species[1]
- Acanthocardia
- †Acanthocardia brewerii
- Acer[2]
- †Acer arcticum
- †Acer beckianum - type locality for species[3]
- †Acer bendirei
- †Acer browni[4]
- †Acer chaneyi[4]
Fossilized leaf found near Spokane; the holotype specimen of the Oligocene-Miocene maple tree Acer chaneyi - †Acer hillsi - type locality for species[4]
- †Acer knolli - type locality for species[4]
- †Acer latahense - type locality for species[4]
- †Acer medianum[4]
- †Acer niklasi[4]
- †Acer olearyi - type locality for species[3]
- †Acer puratanum - type locality for species[3]
- †Acer republicense - type locality for species[4]
- †Acer spitzi - type locality for species[4]
- †Acer stonebergae[4]
- †Acer tigilense[4]
- †Acer toradense - type locality for species[4]
- †Acer washingtonense - type locality for species[4]
- †Acer wehri - type locality for the species[4]
- †Acer whitebirdense[4]
- Acharax
- †Acharax dalli
- †Acherontemys – type locality for genus
- †Acherontemys heckmani – type locality for species
- Acidota
- Acidota crenata
- Acila
- †Acila conradi
- †Acila decisa
- †Acila gettysburgensis
- †Acila pugetensis
- Aclypea
- Acrulia
- †Acrulia tumidula
- Actium
- †Acutostrea
- †Acutostrea idriaensis
- †Adamsochrysa
- †Adamsochrysa wilsoni – type locality for species
- Aegialia
Illustration of an Aegialia dung beetle- †Aegialia cylindrica
- †Aegialia lacustris
- Aesculus[2]
- †Aesculus hankinsii - type locality for species[5]
- Aforia
- †Aforia clallamensis
- Agabus
- Agathidium
- †Aglyptorhynchus
- †Aglyptorhynchus columbianus – type locality for species
- Agonum
- †Ainigmapsychops – type locality for genus[6]
Fossilized wing and holotype specimen of the Eocene lacewing Ainigmapsychops- †Ainigmapsychops inexspectatus – type locality for species[6]
- †Alilepus
- †Alilepus vagus
- †Alilepus wilsoni – or unidentified comparable form
- †Allantodiopsis
- †Allodesmus
Fossilized skeleton of the Miocene seal Allodesmus - †Allophylus
- †Allophylus duktothensis – or unidentified comparable form
- †Allorapisma – type locality for genus[9]
- †Allorapisma chuorum – type locality for species[9]
- Alniphagus
- Alnus
- Altica
- †Altica lazulina – or unidentified comparable form
- Amaea
- †Amaea olympicensis
- †Amaea washingtonensis
- Amara
- †Amara conflata – or unidentified comparable form
- Amauropsis
- †Amauropsis blakeleyensis
- Amia
- †Amia hesperia[12]
- Ammospermophilus
- †Ammospermophilus hanfordi
- Amphimorphina
- †Amphimorphina californica
- Amphistegina
- †Amyzon[12]
Fossilized skeleton found in Republic belonging to the Eocene-Oligocene sucker fish Amyzon aggregatum- †Amyzon aggregatum[12]
- †Anacardites
- †Anacardites franklinensis – type locality for species[8]
- Anadara
- †Anadara devincta
- †Anadara lakei – or unidentified related form
- †Anamirta
- †Anamirta milleri – or unidentified comparable form
- Ancistrolepis
- †Ancistrolepis rearensis
- †Anechinocardium
- †Anechinocardium lorenzanum
- †Anechinocardium weaveri – or unidentified comparable form
- Anemia[7]
- †Anemia elongata[7]
- Anthrax
- †Anthrax dentoni – type locality for species
- †Aperiploma
- †Aperiploma bainbridgensis
- †Aphelops
- †Aphelops mutilus – or unidentified comparable form
- Aphodius
- Aphrocallistes
- †Aphrocallistes polytretos – or unidentified comparable form
- Apion
- †Aporolepas
- †Arceuthobium
- †Archarax
- †Archarax dalli
- Arcoscalpellum
- †Arcoscalpellum knapptonensis – type locality for species
- †Arcoscalpellum raricostatum
- †Arctostaphylos
- †Arctostaphylos uvaursi
- Argobuccinum
Shell of an Argobuccinum triton sea snail- †Argobuccinum goodspeedi
- †Argobuccinum mathewsonii
- †Argobuccinum washingtoniana
- Arpedium
- †Arpedium cribratum
- Artemisia
- Artochia
- †Artochia productifrons
- Asiorestia
- †Asiorestia pallida
- †Asplenium
- †Asplenium delicata – or unidentified comparable form
- Astrangia
- †Astrangia clarki – type locality for species
- Astreopora
- †Astreopora duwamishensis – type locality for species
- †Astreopora sanjuanensis – type locality for species
- Athyrium
- †Athyrium gracilium - type locality for species[7]
- Atomaria
- †Aturia
Restoration of the Paleocene-Miocene nautiloid cephalopod Aturia- †Aturia alabamensis – or unidentified comparable form
- †Aturia angustata
- †Aturia grandior – type locality for species
- Auleutes
- †Auleutes epilobii – or unidentified comparable form
- †Azolla
B
- Balanophyllia
- †Balanophyllia blakelyensis
- †Balanophyllia cowlitzensis – type locality for species
- †Balanophyllia fulleri – type locality for species
- †Balanophyllia teglandae – type locality for species
- †Balanophyllia variabilis
- †Balanophyllia washingtonensis – type locality for species
- Balanus
- Balanus crenatus
Shell (left, internal view) and calcified basis (right) of a modern Balanus crenatus acorn barnacle
- Barbatia
- †Barbatia landesi
- †Barghoornia - type locality for genus[11]
- †Barghoornia oblongifolia - type locality for species[11]
- Bassariscus
- †Bassariscus casei – or unidentified comparable form
- Bathybembix
- †Bathybembix columbiana
- Batissa
- †Batissa dubia
- †Batissa newberryi
- †Behemotops – type locality for genus
- †Behemotops proteus – type locality for species
- Bembidion
A living Bembidion ground beetle - †Berberis
- Betula
- †Betula heteromorpha
- †Betula largei
- †Betula leopoldae - type locality for species[11]
Fossilized leaf found in Republic from the Eocene to birch species Betula leopoldae - Betula papyrifera – or unidentified comparable form
- Bibio
- Bison
- Bledius
- †Bohlenia[11]
- †Bohlenia americana - type locality for species[11]
- †Bombus
- †Bombus proavus – type locality for species
- †Bonellitia
- †Bonellitia paucivaricata
- †Borealodon – type locality for genus[14]
- †Borealodon osedax – type locality for species[14]
- †Borophagus
Restoration of two of the Miocene-Pliocene bone-crushing dog genus Borophagus preying on a camel. Jay Matternes (1964). - Botrychium
- †Botryococcus
- Brachidontes
- †Brachidontes cowlitzensis
- †Brachidontes dichotomus
- †Bretzia
- †Bretzia pseudalces – type locality for species
- †Bruclarkia
- †Bruclarkia oregonensis
- †Bruclarkia thor
- †Bruclarkia yaquinana
- Buccinum
- †Buccinum percrassum
- †Buisnictis
- †Buisnictis breviramus
- Bulimina
- †Bulimina jacksonensis – or unidentified comparable form
- †Bursera
- Byrrhus
C
- Cadulus
- †Cadulus gabbi
- Caesalpinia
- †Caesalpinia spokanensis - type locality for species[15]
- Calathus
- Caligodorus
- †Caligodorus opacus
- †Calkinsia - type locality of genus[8]
- †Calkinsia franklinensis - type locality for species[8]
- †Calkinsia plafkeri – or unidentified comparable form
- Callianassa – report made of unidentified related form or using admittedly obsolete nomenclature
- Callianopsis
A fossilized pincer found in Clallam County belonging to the Oligocene mud shrimp Callianopsis clallamensis- †Callianopsis clallamensis - type locality for species[16]
- Calliostoma
- †Calliostoma mea
- Callithaca
- †Callithaca tenerrima
- †Calorebama
- †Calorebama inornata
- Calosoma
- †Calosoma fernquisti – type locality for species
- Calyptraea
- †Calyptraea diegoana
- †Calyptraea washingtonensis
- Camellia[8]
- †Camellia multiforma[8]
- †Camelops
Life restoration of the Pliocene-Holocene camel Camelops - Cancellaria
- †Cancellaria birchi
- †Cancellaria oregonensis – or unidentified comparable form
- †Cancellaria siletzensis – or unidentified comparable form
- †Cancellaria simplex – or unidentified comparable form
- †Cancellaria wynoocheensis
- Cancer
- †Cancer bainbridgensis
- Canis
- †Capromeryx
Panel-Fossilized skeleton of the Pleistocene dwarf pronghorn Capromeryx- †Capromeryx tauntonensis – type locality for species
- Carabus
- Cardiomya – tentative report
- †Carex
- Carpinus[17]
- †Carpinus perryae[17]
- Carya[2]
- †Carya cashmanensis – type locality for species[8]
- †Carya pugetensis - type locality for species[8]
- †Carya washingtonensis - type locality for species[18]
- Caryophyllia
A living Caryophyllia solitary coral- †Caryophyllia blakeleyensis – type locality for species
- †Caryophyllia woodmanensis – type locality for species
- †Caryophyllia wynoocheensis – type locality for species
- Cassidulina
- †Cassidulina galvinensis – or unidentified comparable form
- Castanea
- †Castanea orientalis
- Castanopsis
- †Castanopsis franklinensis – type locality for species[8]
- Castor
- Catops
- †Cedrelospermum[19]
- †Cedrelospermum species[19]
- Cedrus[2]
- Celastrus
- †Celastrus spokanensis
- Cephalotaxus
- Ceratophyllum
- Cercidiphyllum
A fossilized leaf found in Republic from the Eocene katsura species Cercidiphyllum obtritum - Cercyon
- †Cercyon luniger – or unidentified comparable form
- Cerithiopsis
- †Cerithiopsis vaderensis
- †Cerithiopsis washingtoniana
- Cervus – tentative report
- †Cervus brevitrabalis
- Chama
- Chamaecyparis
- †Chamaecyparis linguaefolia[2]
- Charina
- †Cheilanthes
- †Chenopodium
- Chilostomella
- †Chilostomella oolina – or unidentified comparable form
- Chione
- †Chione ensifera
- †Chione securis
- Chlaenius
- †Chlaenius interruptus
- Chlamys
- †Chlamys hastata
- †Chlamys islandica
A modern shell of Chlamys islandica, or Iceland scallop - †Chlamys waylandi
- †Chrysodomus
- †Chrysodomus imperialis
- Cibicides
- †Cibicides cushmani
- †Cibicides midwayensis
- Cibicidoides
- †Cibicidoides coalingensis
- Cicindela
- Cidarina
- †Cidarina antiquua – type locality for species
- †Cimbrophlebia
- †Cimbrophlebia brooksi – type locality for species
Fossilized wing found in Republic; the holotype specimen of the Eocene scorpionfly Cimbrophlebia brooksi - †Cimbrophlebia westae – type locality for species
- †Cimomia
- †Cimomia hesperia – type locality for species
- Cirsotrema
- †Cirsotrema saundersi
- Cladrastis
- †Cladrastis pugetensis –type locality for species[8]
- Clavus
- †Clavus fryei
- Cleptelmis
- †Cleptelmis ornata
- Clinocardium
- †Clinocardium meekianum
- †Clinocardium nuttallii
- Cocculus
- †Cocculus flabella – or unidentified comparable form
- †Coenocyathus – tentative report
- †Coenocyathus hannibali – type locality for species
- Colpophyllia
- †Colpophyllia reagani – type locality for species
- †Colwellia
- †Colwellia bretzi
- Colymbetes
- Comptonia
Fossilized leaf found in Republic from the Eocene sweetfern species Comptonia columbiana - †Conchocele
- †Conchocele bisecta
- Conus
- †Conus aegilops
- †Conus cowlitzensis
- †Conus vaderensis
- †Conus weaveri
- †Conus weltoni
- Corbicula
- †Corbicula cowlitzensis
- †Corbicula willisi – or unidentified comparable form
- Corbula
- †Corbula dickersoni
- †Corbula parilis
- Corixa
- †Cormocyon
Fossilized skull of the Oligocene-Miocene bone-crushing dog Cormocyon- †Cormocyon copei
- Cornus
- Corticaria
- Corylopsis[21]
- †Corylopsis reedae - type locality for species[21]
- Corylus[17]
- †Cosoryx
- †Cosoryx cerroensis – or unidentified comparable form
- Cossonus
- †Cowlitzia
- †Cowlitzia washingtonensis
- †Cranioceras
Restoration of the Miocene palaeomerycid Cranioceras, a relative of modern deer, with anachronistic human to scale- †Cranioceras unicornis – or unidentified comparable form
- Craniscus
- †Craniscus edwilsoni – type locality for species
- †Craspedochiton
- †Craspedochiton eernissei
- Crassatella
- †Crassatella uvasana
- †Crassatella wasana
- †Crassatella washingtoniana
- Crenella – tentative report
- Crepidula
- †Crepidula praerupta
- †Crepidula princeps
- †Crepidula rostralis
- †Crepidula ungana
- †Cristispira
- †Cristispira pugetensis
- Crotalus
.jpg.webp)
A living Crotalus, or rattlesnake - †Cryptochorda
- †Cryptochorda californica
- †Cryptolucina
- †Cryptolucina megadyseides
- Cryptomya
- †Cryptomya californica
- Cryptonatica
- Cryptophagus
- Curimopsis
- Cyathea
A fossilized frond found in Whatcom County from the Eocene tree fern Cyathea pinnata- †Cyathea inequilateralis – or unidentified comparable form
- †Cyathea pinnata[7]
- Cyclammina
- †Cyclichnina
- †Cyclichnina tantilla
- Cyclocardia
- †Cyclocardia hannibali
- †Cyclocardia subtenta
- Cyclostremella
- Cymbiodyta
- †Cynarctus
- †Cynarctus crucidens
- Cypraea
- †Cypraeogemmula
- †Cypraeogemmula warnerae
- Cytilus
D
- Danaea
- †Danaea borealis - type locality for species[7]
- Dascillus – tentative report
- †Dascillus latahensis – type locality for species
- Delectopecten
- Deltocyathus
- †Deltocyathus insperatus – type locality for species
- Dendroctonus
- Dendrophyllia
A living Dendrophyllia cup coral- †Dendrophyllia cowlitzensis – type locality for species
- †Dendrophyllia hannibali – type locality for species
- †Dendrophyllia tejonensis
- Dennstaedtia
- †Dennstaedtia delicata - type locality for species[7]
- Dentalina
- †Dentalina consorbrina – or unidentified comparable form
- †Dentalina dusenburyi – or unidentified comparable form
- †Dentalina hispidocostata – or unidentified comparable form
- †Dentalina longiscata
- Dentalium
- †Dentalium porterensis
- †Dentalium pseudonyma
- †Dentalium schencki
- †Dentalium stramineum
- †Dentimitra
- †Dentimitra cretacea
- †Desmatophoca
- †Desmatophoca brachycephala – type locality for species
- †Desmostylus
Life restoration of the Oligocene-Miocene herbivorous marine mammal Desmostylus - Dianous
- †Dianous nitidulus
- Diapterna
- †Diceratherium
- †Diceratherium annectens
- Dicotylophyllum
- †Dicotylophyllum kummerensis
- †Dillhoffia[22]
- †Dimorphastrea
- †Dimorphastrea vaughani – type locality for species
- †Dinofelis
- †Dinofelis palaeoonca – or unidentified comparable form
- †Dinokanaga[23]
A fossilized wing with original coloration found in Republic; the holotype specimen of the Eocene scorpionfly Dinokanaga andersoni- †Dinokanaga andersoni – type locality for species[23]
- †Dinokanaga dowsonae[23]
- †Dinokanaga sternbergi – type locality for species[23]
- Diodora
- Diospyros[3]
- †Diospyros washingtoniana - type locality for species[3]
- †Diplodipelta
- †Diplodipelta miocenica
- Diplodonta
- †Dipoides
- †Dipoides rexroadensis
- †Discotrochus
- Dosinia
- †Dosinia whitleyi
- †Dryophyllum
- †Dryophyllum pugetensis – type locality for species[8]
- Dryopteris
Illustration of a modern Dryopteris, or wood fern - Dyschiriodes
- Dyschirius
- Dyslobus
- Dytiscus
- †Dytiscus latahensis – type locality for species
E
- Echinophoria
- †Echinophoria dalli
- †Echinophoria trituberculata
- †Ectinochilus
- †Ectinochilus macilentus
- Eggerella
- †Eggerella bradyi – or unidentified comparable form
- Elaphe
- †Elaphe pliocenica
- †Elaphe vulpina
- Elaphrus
A living Elaphrus ground beetle - Eleocharis
- Elphidium
- Emarginula
- †Emarginula dotyhillsensis – type locality for species
- †Enhydrocyon
- †Eoceneithycerus - type locality for genus[24]
- †Eoceneithycerus carpenteri - type locality for species[24]
- †Eoprephasma – type locality for genus[25]
- †Eoprephasma hichensi – type locality for species[25]
- †Eopustularia
- †Eopustularia goedertorum – type locality for species
- †Eorpa
- †Eorpa elverumi – type locality for species
- †Eorpa ypsipeda – tentative report
- †Eosalmo[12]
- †Eosalmo driftwoodensis[12]
A fossilized skeleton found in Republic belonging to the Eocene salmon Eosalmo driftwoodensis
- Ephedra
- Epitonium
- †Epitonium berthiaumei
- †Epitonium clallamense
- †Epitonium olympicensis – or unidentified related form
- †Epitonium schencki
- Eponides
- †Eponides mexicana
- †Eponides yeguaensis
- Epophthalmia
- †Epophthalmia biordinata – type locality for species
- †Eporeodon
- †Equisetum
- Equus
- †Eratotrivia
- †Eratotrivia crescentensis
- Erginus
- †Erginus vaderensis
- Eucommia[26]
- †Eucyon
- Eulima
- †Eulima clarki
- †Eulimia
- †Eulimia lewisiana
- Eupatagus
- †Eupatagus carolinensis – or unidentified related form
- Eurete
- †Eurete geoderti – tentative report
- †Eurete goederti
- Eurytellina
- †Eurytellina lorenzoensis
- Eusmilia
A living Eusmilia stony coral- †Eusmilia bainbridgensis – type locality for species
- Euspira
- †Euspira hotsoni
- †Euspira nuciformis
- †Eutrephoceras
- †Eutrephoceras eyerdami – type locality for species
- †Exilia
- †Exilia clarki
- †Exilia dickersoni
- †Exilia mclellani
F
- Fagopsis[11]
- Fagus
- †Fagus washoensis[2]
- Falsifusus – tentative report
- †Falsifusus marysvillensis
- Farrea – tentative report
- Felis
- †Felis lacustris
- †Ficopsis
- †Ficopsis cowlitzensis
- †Ficopsis redmondi – or unidentified comparable form
- Ficus
- †Ficus clallamensis
- †Ficus modesta
- †Ficus restorationensis
- †Ficus washingtonensis
- Flabellum
- †Flabellum californicum
- †Flabellum clarki
- †Flabellum hertleini – type locality for species
- †Florissantia
- †Folindusia
- †Folindusia miocenica – type locality for species
- Fothergilla
- †Fothergilla durhamensis – type locality of species[8]
- †Fothergilla malloryi - type locality for species[21]
- Foveoscapha
- †Fraxinus[2]
- †Fraxinus yubaensis – or unidentified comparable form
- †Fucaia – type locality for genus
- †Fucaia buelli – type locality for species
- †Fucaia goedertorum – type locality for species
- Fulgoraria
- †Fulgoraria indurata
- †Fulgoraria weaveri
- Fulgurofusus
- †Fulgurofusus washingtonensis
- †Fulgurofusus washingtoniana
- Fusinus
A living Fusinus sea snail- †Fusinus dilleri
G
- Galeodea
Shell of a Galeodea helmet snail- †Galeodea apta
- †Galeodea crescentensis
- †Galeodea fax
- †Galeodea petrosa
- †Galeodea rex
- †Galeodea trituberculata
- Galeruca
- Galium
- Gari
- †Gari cowlitzensis
- †Gari hornii – or unidentified related form
- †Gari olequahensis
- Gastrophysa
- Gaudryina
- †Gaudryina jacksonensis
- Gemmula
- †Gemmula abacta
- †Gemmula barksdalei
- †Gemmula borgenae
- †Gemmula pluchra
- †Gemmula pulchra
- Geodromicus
- Georissus
- Gerris
- Ginkgo[28]
- †Ginkgo beckii - type locality of the species[29]
- Ginkgo biloba[28]
An Eocene fossilized leaf found in Republic from the Eocene-modern ginkgo speciesGinkgo biloba - †Ginkgo dissecta[28]
- Gleditsia[3]
- †Gleditsia columbiana - type locality for species[3]
- Globigerina
- Globobulimina
- †Globobulimina pacifica
- Globocassidulina
- †Globocassidulina globosa
- Glycymeris
- †Glycymeris fresnoensis
- †Glycymeris sagittata
- †Glycymeris wishkahensis
- †Glyphithyreus
- †Glyphithyreus weaveri
- Glyptostrobus
Fossilized foliage of the cypress relative Glyptostrobus - †Goweria - type locality of genus[8]
- Gryphus
- Guttulina
- †Guttulina frankei
- Gymnusa
- Gyrineum
- †Gyrineum marshalli
- Gyrinus
- Gyroidina
- †Gyroidina orbicularis
H
- †Hamamelites
- †Hamamelites voyana – or unidentified comparable form
- Hapalaraea
- Haplocochlias
- †Haplocochlias montis
- Haplophragmoides
- Helophorus
- †Helophorus lacustris
- †Helophorus oregonensis – or unidentified comparable form
- †Hemiauchenia
Fossilized lower jaw of the Miocene-Pleistocene llama relative Hemiauchenia- †Hemiauchenia macrocephala – or unidentified comparable form
- Hemithiris
- †Hemithiris reagani
- Heptranchias
- Hesperibalanus
- †Hesperibalanus cornwalli – type locality for species
- †Hesperibalanus sookensis – or unidentified related form
- Heterlimnius
- Heterosilpha
- Hexactinella – tentative report
- †Hexactinella conica – type locality for species
- †Hexactinella tubula – type locality for species
- Hiatella
- Hiodon
- †Hipparion
Life restoration of a herd of the Miocene-Pleistocene horse Hipparion. Heinrich Harder (1920).- †Hipparion condoni
- Hipponix
- †Hipponix amoldi
- †Hippuris
- Homalopoma
- †Homalopoma hieroglyphica
- †Homalopoma umpquaensis
- †Hoplictis
- †Hoplictis grangerensis
- †Humptulipsia - type locality for genus[32]
- †Humptulipsia raui - type locality for species[32]
- Hydrangea[2]
- †Hydrangea bendirei - [2]
- Hydrobius
- Hydrothassa
- †Hydrothassa vittata
- Hygrotus
- Hylurgops
- †Hylurgops rugipennis
- †Hymenarcys
- †Hymenarcys cridlandi – type locality for species
- Hyperbaena[8]
- †Hyperbaena dilleri[8]
- †Hypertragulus
- †Hypolagus
- †Hypolagus edensis
- †Hypolagus furlongi
- †Hypolagus gidleyi
- †Hypolagus ringoldensis – type locality for species
- Hypserpa[8]
I
- Idas
- Ilex[2]
- †Ilex opaca – or unidentified comparable form
Branches of a living Ilex opaca, or American holly, full of ripe fruit
- Ilybius
- †Involutina
- †Involutina incertus – or unidentified comparable form
- Ips
- †Ips concinnus
- Ischnochiton
- †Ischnochiton goederti
- Ischnosoma
- †Ischnosoma pictum
- Isochnus
- †Isochnus rufipes
- Isocrinus – tentative report
- Isognomon
- †Isognomon clarki
- Isurus
A modern Isurus, or mako shark - Itea[11]
- †Ithyceroides – type locality for genus
- †Ithyceroides klondikensis – type locality for species
K
- Kalissus
- †Kalissus nitidus
- Katherinella
- †Katherinella angustiformis
- †Katherinella angustifrons
- †Katherinella arnoldi
- †Katherinella augustifrons
- Kellia
- †Kellia twinensis
- †Klondikia – type locality for genus
- †Klondikia whiteae – type locality for species
- Koelreuteria
A living Koelreuteria tree- †Koelreuteria dilcheri[33]
- †Kolponomos
- †Kronokotherium – tentative report
- †Kummelonautilus
- †Kummelonautilus cookanus – or unidentified related form
L
- Laccobius
- †Laccobius ellipticus – or unidentified comparable form
- Lamelliconcha
- †Lamelliconcha eocenica
- Lampropeltis
- †Langeria – type locality for genus[11]
Fossilized leaf found in Republic from the Eocene witch-hazel relative Langeria magnifica- †Langeria magnifica – type locality for species[11]
- Lanternarius – or unidentified comparable form
- †Lanternarius parrotus
- Lapsus
- †Lapsus tristis
- †Latahcoris – type locality for genus
- †Latahcoris spectatus – type locality for species
- Latirus
- †Latirus eocenica
- Laurus
- †Laurus grandis
- †Leguminosites
- †Leguminosites bonseri
- Leiodes
- Lemna
- Lenticulina
- Lepidochitona
A living Lepidochitona chiton- †Lepidochitona lioplax
- †Lepidochitona squiresi
- †Lepidochitona washingtonensis
- Lepidophorus
- †Lepidophorus alternatus
- Lepidopleurus
- †Lepidopleurus propecajetanus
- †Leptarctus
- Leptastrea – tentative report
- †Leptastrea hertleini
- Leptochiton
- †Leptochiton alveolus
- Lepyrus – or unidentified comparable form
- Leukoma
- †Libotonius[34]
- Lioligus
- Lioon
- Liothorax
- †Liothorax alternatus
- Liotia
- †Liotia washingtoniana – type locality for species
- Liquidambar
The autumn foliage of a living Liquidambar, or sweetgum tree- †Liquidambar californica – or unidentified comparable form
- †Liquidambar changii[35]
- †Litorhadia
- †Litorhadia washingtonensis
- †Lophomastix
- †Lophomastix altoonaensis
- †Lophomastix antiqua
- †Lophomastix boykoi
- †Lophomastix kellyi
- Loricera
- Lucinoma
- †Lucinoma acutilineata
- †Lucinoma annulatum
- †Lucinoma columbiana – or unidentified comparable form
- †Lucinoma hannibali
- Lycopodium[2]
- Lygodium
- †Lygodium kaulfussi[36]
- Lynx
A living Lynx- †Lynx canadensis
- †Lynx rufus – or unidentified comparable form
- Lyria
- †Lyria andersoni
M
- Macaranga
- †Macclintockia
- †Macclintockia pugetensis – type locality for species[8]
- †Macginitiea[11]
Fossilized leaf found in Republic from the Eocene plane tree relative Macginitiea gracilis- †Macginitea angustilobia
- †Macginitiea gracilis[11]
- Macoma
- †Macoma albaria
- †Macoma astori
- †Macoma calcarea
- †Macoma inquinata
- †Macoma nasuta
- †Macoma secta – or unidentified related form
- †Macoma snohomishensis
- †Macoma sookensis
- †Macoma twinensis
- Macrocallista
- †Macrocallista cathcartensis
- Mactromeris
- †Mactromeris albaria
- †Mactromeris pittsburgensis
- Madracis
- †Madracis crescentensis – type locality for species
- †Madracis stewarti – type locality for species
- Magdalis
- Magnolia
- †Mammut
- †Mammuthus
- †Mammuthus columbi
- †Mammuthus primigenius
Life restorations of a Mammut americanum, or American mastodon (right), and a Mammuthus primigenius, or wooly mammoth (left)
- Marcia
- †Marcia oregonensis
- Margarites
- †Margarites serceus
- Marginella
- †Marginella shepardae
- Marginulina
- †Marginulina subbulata
- Martinottiella
- †Martinottiella communis
- †Megalonyx
- Megarthrus
- †Megatylopus
- †Megatylopus cochrani – or unidentified comparable form
- †Megistostoma
- †Megistostoma gabbiana
- †Megokkos[37]
- †Meibomites
- †Meibomites lucens
- Melanoides
- †Melanoides fettkei
- †Menispermites
- †Menispermites parvareolatus – or unidentified comparable form
- †Menyanthes
- †Merycoides
- †Mesoreodon
- †Metacarcinus
- †Metanephrocerus
- †Metanephrocerus belgardeae – type locality for species[39]
- Metasequoia
- Microedus
- Microlestes
- Micropeplus
- †Micropeplus cribratus
- †Micropeplus laticollis
- †Micropeplus nelsoni
- †Micropeplus punctatus
- †Miocordulia – type locality for genus
- †Miocordulia latipennis – type locality for species
- †Miohippus
- †Miohippus equiceps – or unidentified comparable form
- †Miohippus equinanus – tentative report
- †Miopsyche – type locality for genus
- †Miopsyche alexanderi – type locality for species
- †Miopsyche martynovi – type locality for species
- Mitra
- †Mitra washingtoniana
Fossilized shell found in Vader; the hypotype specimen of the Eocene miter snail Mitra washingtoniana
- Modiolus
- †Modiolus restorationensis – or unidentified related form
- †Modiolus willapaensis
- †Molopophorus
- †Molopophorus newcombei – or unidentified related form
- Montipora
- †Montipora schencki – type locality for species
- Morychus
- Murex
- †Murex cowlitzensis
- †Murex sopenahensis
- †Mursia
- †Mursia marcusana[16]
- Mustela
- †Mustela rexroadensis – or unidentified comparable form
- †Mya
- Mycetoporus
- †Mycetoporus punctatissimus
- Myriophyllum
- †Myrmeciites[40]
- Mytilus
- †Mytilus dichotomus
- †Mytilus edulis
- †Mytilus sammamishensis
- †Mytilus snohomishensis
- †Mytilus stillaguamishensis
- †Mytilus tichanovitchi – or unidentified related form
N
- †Nassarius mednica
- Natica
Multiple views of a fossilized shell belonging to a Natica moon snail- †Natica clarki – or unidentified comparable form
- †Natica oligocenica
- †Natica teglandae
- †Natica vokesi
- †Natica weaveri
- †Nayadina
- †Nayadina batequensis
- Nebria
- †Nekewis
- †Nekewis washingtoniana
- †Nekrolagus
- †Nekrolagus progressus – or unidentified comparable form
- Nemocardium
- †Nemocardium lincolnensis
- †Nemocardium linteum
- †Neoephemera
- †Neoephemera antiqua – type locality for species[41]
- Neotoma
.jpg.webp)
A living Neotoma, or pack rat- †Neotoma fossilis – or unidentified comparable form
- †Neotoma quadriplicata – or unidentified comparable form
- Neptunea
- †Neptunea landesi
- †Neptunea lincolnensis
- †Neptunea teglandae
- Nerita
- †Nerita triangulata
- Neverita
- †Neverita globosa
- †Neverita jamesae
- †Neverita reclusiana
- †Nitidavenus
- †Nitidavenus conradi – or unidentified comparable form
- Nitidotachinus
- †Nitidotachinus tachyporoides – or unidentified comparable form
- †Nolorhynchus
- Notaris
- Notiophilus
- Nucella
- †Nucella decemcostata
- †Nucella lamellosa
Shell of a Nucella lamellosa murex snail
- †Nucleolaria
- †Nucleolaria cowlitziana – type locality for species
- Nucula
- †Nucula hannibali
- Nuculana
- †Nuculana aikiensis
- †Nuculana alkiensis
- †Nuculana calkinsi
- †Nuculana chehalisensis
- †Nuculana cowlitzensis – or unidentified related form
- †Nuculana elmana – or unidentified comparable form
- †Nuculana grasslei
- †Nuculana vaderensis
- †Nuculana washingtoni
- Nuphar[42]
- Nymphes[43]
Fossilized wing found in Ferry County; the holotype specimen of the Eocene lacewing Nymphes georgei- †Nymphes georgei – type locality for species[43]
- Nyssa[2]
- †Nyssa eydei - type locality for species[5]
O
- Ochthebius
- †Ochthebius discretus
- †Ochthebius holmbergi – or unidentified comparable form
- Ocypus
- Odocoileus
- Odocoileus hemionus
.jpg.webp)
Living male (right) and female (left) Odocoileus hemionus, or mule deer.
- Odostomia
- †Oecophylla
- †Oecophylla kraussei – type locality for species[44]
- Olivella
- †Olivella mathewsonii
- Olophrum
- †Olophrum boreale
- †Olophrum consimile
- Ondatra
- †Ondatra minor
- Opalia
- †Opalia bravinderi
- Ophiodermella
- †Ophiodermella olympicensis
- †Ophiomys
- †Ophiomys mcknighti
- †Ophiomys taylori
- Opisthius
- †Opisthius richardsoni
- Orchestes
- †Orchestes pallicornis
- Oreodytes – or unidentified comparable form
- Orobanus
- Orontium
- †Orontium wolfei[45]
Fossilized leaf found in Ferry County belonging to the Eocene golden-club Orontium wolfei
- Oropus
- Osmunda[46]
- Ostrea
- Oxytelus
- †Oxytelus laqueatus
- †Oxytelus niger
P
- †Pachycrommium
- †Pachycrommium clarki
- †Paenemarmota
- †Paenemarmota sawrockensis – or unidentified comparable form
- Paguristes[47]
- †Paguristes hokoensis[47]
- †Palaeocarpinus[17]
- †Palaeocarpinus barksdaleae[17]
- †Palaeohypotodus
- †Palaeolagus – or unidentified comparable form
- †Palaeopsychops
- †Palaeopsychops marringerae – type locality for species
Eocene giant lacewing Palaeopsychops marringerae wing with color-patterning - †Palaeopsychops timmi – type locality for species
- †Paleoallium - type locality for genus
- †Paleoallium billgenseli - type locality for species[48]
- Paliurus
- †Paliurus hesperius
- Pandora
- †Pandora vanwinkleae
- †Pandora washingtonensis
- Panopea
- †Panopea abrupta
- †Panopea ramonensis
- †Paraconcavistylon - type locality for genus[49]
- †Paraconcavistylon wehrii - type locality for species[49]
- †Paracryptotis
- †Paracryptotis rex
- Paracyathus
- †Paraenhydrocyon
- †Parailurus
- †Paramylodon
Fossilized skeleton of the Pliocene-Pleistocene ground sloth Paramylodon - †Parastylotermes
- †Parastylotermes washingtonensis – type locality for species[50]
- Pardalosus
- †Pardalosus pardalis
- Parvamussium
- †Parvamussium stanfordense
- Patelloida
- †Patelloida tejonensis
- Patinopecten
- †Patinopecten dilleri
- Patrobus
- †Patrobus fossifrons
- †Patrobus stygicus
- Paulownia[2]
- †Paulownia columbiana - type locality for species[2]
- Pecten
- †Pecten clallamensis
- Pediastrum
- †Pedicularis
- Pelecomalium
- †Pelecomalium testaceum
- Pelenomus
- †Pelenomus squamosus
- Pelophila
- †Pentacentron Manchester et al., 2018[51]
- †Pentacentron sternhartae Manchester et al., 2018[51]
- †Periope
- †Periope ivesi – type locality for species
- Peromyscus
A living Peromyscus, or deer mouse- †Peromyscus nosher
- †Perse – tentative report
- Persea
- Persicula
- Petrophyllia
- †Petrophyllia clarki
- †Petrophyllia weaveri – type locality for species
- Phaedon
- †Phaedon armoraciae
.jpg.webp)
A living Phaedon armoraciae leaf beetle - †Phaedon oviforme
- †Phaedon prasinellus
- Phenacomys – or unidentified comparable form
- †Phenacomys intermedius
- Phlaeopterus
- Phloeosinus
- †Phloeosinus keeni – or unidentified comparable form
- Phloeotribus
- †Phoebe[11]
- †Photinia
- †Photinia pageae – type locality for species
Fossilized leaf found in Republic from the Eocene rose relative Photinia pagae
- Phryganea
- †Phryganea spokanensis – type locality for species
- Phytocrene
- †Phytocrene acutissima – or unidentified comparable form
- Picea[2]
- Pinus[2]
- Pitar
- †Pitar avenalensis
- †Pitar californiana
- †Pitar quadratus
- †Pitar soledadensis – or unidentified comparable form
- †Pitar wasana
- Pituophis
- Pityophthorus
- †Pityophthorus digestus – or unidentified comparable form
- †Pityophthorus nitidulus
- †Plafkeria
- †Plafkeria rentonensis – or unidentified comparable form
- Plagiocardium
- †Plagiocardium breweri
- Planolinoides
- †Planolinoides pectoralis
- Plantago
- Platanus[2]
- Plateumaris
- Platycarya
- †Platycarya pseudobrauni – or unidentified comparable form
- †Platygonus
Restoration of a herd of alarmed Miocene-Pleistocene peccaries of the genus Platygonus. Charles R. Knight (1922).- †Platygonus pearcei
- †Platyopuntia
- Platystethus
- Plectofrondicularia
- †Plectofrondicularia vaughani – or unidentified comparable form
- †Plionarctos
- †Plionarctos harroldorum – type locality for species
- Polinices
- †Polinices gesteri
- †Polinices hornii
- †Polinices lewisii
- †Polinices rectus
- †Polinices victorianus
- †Polinices washingtonensis
- Polygonum
- Polypodium – tentative report
- †Polystoechotites[53]
- †Polystoechotites barksdalae - type locality for species[53]
Fossilized wing found in Republic; the holotype specimen of the Eocene giant lacewing Polystoechotites barksdalae - †Polystoechotites falcatus - type locality for species[53]
- †Polystoechotites lewisi - type locality for species[53]
- Populus
- †Populus heteromorpha
- †Populus lindgreni
- †Populus washingtonensis
- Poromya
- †Poromya teglandae
- Portlandia
- †Portlandia packardi
- †Potamides
- †Potamides lewisiana
- †Potamides packardi
- Potamogeton[2]
- †Potentilla
- †Priscacara
Fossilized skeleton of the Eocene perch Priscacara- †Priscacara campi – type locality for species
- †Priscofusus
- †Priscofusus chehalisensis
- †Priscofusus geniculus – or unidentified related form
- †Priscofusus goweri
- †Priscofusus sanctaecrucis
- †Priscofusus slipensis
- †Priscofusus stewarti
- †Procastoroides
- †Procastoroides idahoensis – or unidentified comparable form
- Procyon – tentative report
- †Prodipodomys
- †Promerycochoerus
Life restoration of the Miocene hippopotamus-like oreodont Promerycochoerus both onshore and in the water. Robert Bruce Horsfall (1913).- †Promerycochoerus superbus
- †Proneuronema[54]
- †Proneuronema wehri - type locality for species[54]
- †Propalosoma – type locality for genus[55]
- †Propalosoma gutierrezae - type locality for species[55]
- †Prosthennops
- Proteinus
- †Provanna
- †Provanna antiqua
- Prunus
- †Prunus rustii
- Psammacoma
- †Psammacoma arctata
- Pselaptrichus
- †Pseudoglandulina
- †Pseudoglandulina inflata – or unidentified comparable form
- Pseudohylesinus
- †Pseudohylesinus nebulosus
- †Pseudohylesinus sericeus – or unidentified comparable form
- Pseudolarix
- Pseudolarix wehrii
Fossilized wing seed found in Republic from the Eocene golden larch species Pseudolarix wehrii
- Pseudoliva
- †Pseudoliva lineata
- Pseudopsis
- †Pseudopsis sulcata - or unidentified loosely related form
- Pteria
- †Pteria clarki
- †Pteria pellucida – or unidentified comparable form
- Pteris
- †Pteris whatcomensis -type locality for species[7]
- Pterocarya[2]
- Pterostichus
- †Pterostichus adstrictus
- †Pterostichus castaneus
- †Pterostichus fernquisti – type locality for species
- †Pterostichus pumilus
- †Pterostichus riparius
- †Pteronepelys[56]
- †Pteronepelys wehrii[56]
- Pteryngium
- †Pteryngium crenatum
- Pterynotus
- †Pterynotus washingtonicus – type locality for species
- †Pugetia - type locality for genus[8]
- †Pugetia longifolia – type locality for species[8]
- Puma
- Puma concolor – tentative report
- Purpura
- †Purpura lurida
- Pycnoglypta
- †Pycnoglypta campbelli
- Pyramidella
- †Pyramidella vaderensis
- Pyrgo
- †Pyrgo lupheri – or unidentified comparable form
Q
- Quedius
- Quercus[2]
A living Quercus, or oak tree- †Quercus cognatus
- †Quercus hiholensis[57]
- †Quercus leuca - type locality for species[3]
- †Quercus sahnii - type locality for species[5]
- †Quercus simulata
- †Quercus treleasii
- Quinqueloculina
- †Quinqueloculina imperalis
- †Quinqueloculina imperialis
- †Quinqueloculina minuta – or unidentified comparable form
R
- Rangifer
- Ranina
- Ranina americana
- Raninoides
- Ranunculus
- Rectiplanes – tentative report
- Reichenbachia
- †Republica – type locality for genus[11]
- Retusa
- †Retusa tantilla
- †Rhamnites[8]
- Rhantus
- Rhus
Fossilized compound leaf from an Eocene sumac Rhus hybrid- †Rhus boothillensis - type locality for species[58]
- †Rhus garwellii - type locality for species[58]
- †Rhus malloryi – type locality for species[11][58]
- †Rhus republicensis - type locality for species[58]
- †Rhus typhina – or unidentified comparable form
- †Rhynchonella
- †Rhynchonella washingtoniana
- Rhyncolus
- †Rhyncolus brunneus
- †Rhysocaryoxylon[3][59]
- †Ribes
- Rimella
- †Rimella elongata
- Rinorea – or unidentified comparable form
- Robulus
- †Robulus texanus – or unidentified comparable form
- Rosa
- †Rotularia
- †Rotularia tejonense
- Rumohra
- †Rumohra bartonae - type locality for species[7]
S
- †Sabalites[7]
Fossilized fronds from Sabalites campbelli - Saldula
- Salix[2]
- †Salix heartensis – or unidentified comparable form
- †Salix spokanensis - type locality for species[10]
- Salpichlaena[7]
- †Salpichlaena serrata[7]
- †Salvinia
- †Salvinia preauriculata – or unidentified comparable form
- †Sarcobatus
- Sassafras
- †Sassafras hesperia - type locality for species[11]
Fossilized leaf of the Eocene sassafras Sassafras hesperia
- †Satherium
- Saxidomus
- †Saxidomus giganteus
- Scalina
- †Scalina lincolnensis
- Scapanus
- Scaphander
- †Scaphander costatus
- †Scaphander washingtonensis
- Scaphinotus
- Schizaster
- †Schoepfia
- †Schoepfia republicensis - type locality for species[11]
- †Scirpus
- Sclerhelia – tentative report
- Selaginella[2]
- Semicassis
- †Semicassis pyshtensis
- Septifer
- †Septifer dichotomus
- Serripes
- †Shepherdia
- †Shepherdia canadensis
Berries and foliage of a living Shepherdia canadensis, or Canada buffaloberry
- †Shirleya[60]
- Siderastrea
- †Siderastrea vancouverensis – or unidentified comparable form
- †Siderastrea washingtonensis – type locality for species
- Sigmomorphina
- †Sigmomorphina schencki
- Sinum
- †Sinum obliquum
- †Sinum occidentalis – or unidentified related form
- †Sinum scopulosum
- Siphonalia
Shell of the whelk sea snail Siphonalia- †Siphonalia bicarinata
- †Siphonalia sopenahensis
- Sitona
- †Sitsqwayk
- †Sitsqwayk cornishorum – type locality for species
- Smilax
- Solamen
- †Solamen snavelyi
- Solariella
- †Solariella cicca
- †Solariella garrardensis
- †Solariella kincaidi
- Solen
- †Solen sicarius
- Solena
- †Solena clarki
- †Solena columbina
- †Solena conradi
- †Solena parallelus – or unidentified comparable form
- Sonoma
- Sorex
A living Sorex, or long-tailed shrew- †Sorex meltoni – or unidentified comparable form
- †Sorex powersi
- †Sparganium
- Spermophilus
- †Spermophilus howelli – or unidentified comparable form
- †Spermophilus russelli
- Spilogale
- †Spirocrypta
- †Spirocrypta pileum
- Spirotropis
- †Spirotropis kincaidi
- Spisula
.JPG.webp)
Shell of a Spisula, or surf clam- †Spisula hannibali – or unidentified comparable form
- †Spisula packardi
- †Spisula sookensis
- †Spisula twinensis
- Spondylus
- †Spondylus carlosensis
- †Squaloziphius – type locality for genus
- †Squaloziphius emlongi – type locality for species
- Squalus
A living Squalus, or spurdog- †Squalus occidentalis
- Stenoplax
- †Stenoplax quimperensis
- Stenus
- Stephanocyathus
- †Stephanocyathus holcombensis – type locality for species
- Stephostethus
- Steremnius
- †Steremnius carinatus
- †Steremnius tuberosus
- Sthereus
- †Sthereus multituberculatus
- †Sthereus quadrituberculatus
- †Stylaster
A living Stylaster hydroid- †Stylaster milleri – type locality for species
- †Sulcobuccinum
- †Sulcobuccinum dilleri
- Surculites
- †Surculites mathewsoni
- †Surculites wynoocheensis – tentative report
- Sveltella
- †Sveltella keaseyensis – tentative report
- Syntomium
- †Syntomium malkini – or unidentified comparable form
- Syntomus
T
- Tachinus
- †Tachinus angustatus
- †Tachinus crotchii
- †Tachinus frigidus
- †Tachinus instabilis – or unidentified comparable form
- †Tachinus mimus
- †Tachinus thruppi
- †Tauntonophis – type locality for genus
- †Tauntonophis morganorum – type locality for species
- Taxidea
- Taxodium
- †Tejonia
- †Tejonia moragai
- †Teleoceras
Restoration of the Miocene-Pliocene rhinoceros Teleoceras- †Teleoceras hicksi
- †Teleoceras major – or unidentified comparable form
- Tellina
- †Tellina cowlitzensis
- †Tellina emacerata
- †Tellina soledadensis
- Tenagodus
- †Tenagodus bajaensis
- Terebratulina
- †Terebratulina unguicula
- †Terebratulina washingtonensis
- †Terebratulina weaveri
- Teredo
- †Ternstroemites
- †Ternstroemites ravenensis – type locality for species[8]
- Tetracentron [51]
- †Tetracentron hopkinsii Pigg et al., 2007[51]
Tetracentron hopkinsii leaf, Ypresian Klondike Mountain Formation
- †Tetrapleuroxylon[61]
- Tetrascapha
- Thais
- †Thais lamellosa
- †Thalictrum
- Thamnophis
A living Thamnophis, or garter snake - Thanatophilus
- Thomomys
- †Thomomys gidleyi – or unidentified comparable form
- Thracia
- †Thracia dilleri
- †Thracia schencki
- †Thracia trapezoides
- Thyasira
- †Thyasira folgeri
- †Thyasira hannibali
- †Thyasira peruviana – tentative report
- Tilia
- †Tilia johnsoni – type locality for species[11]
Fossilized leaf found in Republic from the Eocene basswood tree Tilia johnsoni
- Tipula
- †Tipula latahensis – type locality for species
- †Tivelina
- †Tivelina vaderensis
- †Tonsala – type locality for genus
- †Tonsala buchanani – type locality for species
- †Tonsala hildegardae – type locality for species
- Tournotaris
- †Tournotaris bimaculatus – or unidentified comparable form
- Trechiama – or unidentified related form
- Trechus
- †Trechus chalybeus
- †Trechus oregonensis
- †Trechus ovipennis – or unidentified comparable form
- Tresus
- Trichalophus
- †Trigonictis
- †Trigonictis cookii
- †Trigonictis macrodon
- Trichopeltarion
- †Trichopeltarion berglundorum[16]
- Trochita
- Trochocyathus
- †Trochocyathus crooki
- †Trochocyathus nomlandi
- †Trochocyathus townsendensis – type locality for species
- Trochodendron[62]
- Trophon
- Trypophloeus
- †Trypophloeus salicis
- †Tsuga[2]
- †Tsukada – type locality for genus[11]
- †Tsukada davidiifolia – type locality for species[11]
Fossilized leaf found in Republic from the Eocene dove tree relative Tsukada davidiifolia
- Tubastraea
- †Tubastraea nomlandi – type locality for species
- Tudicla
- †Tudicla blakei
- †Tudicla trophonoides
- †Turbinolia
- †Turbinolia quaylei – type locality for species
- †Turbinolia weaveri – type locality for species
- †Turbinolina
- †Turbinolina dickersoni
- Turcica
- †Turcicula
- †Turcicula washingtonensis
- †Turcicula washingtoniana
- Turricula
- †Turricula cowlitzensis
- †Turricula ornata
- Turris
- †Turris perversa
- Turritella
Fossilized shells of the Late Jurassic-modern tower snail Turritella- †Turritella andersoni
- †Turritella blakeleyensis
- †Turritella buwaldana – or unidentified comparable form
- †Turritella oregonensis
- †Turritella porterensis
- †Turritella uvasana
- †Turritella vaderensis – or unidentified comparable form
- †Turritella wasana
- Typha
U
Ulmus chuchuanus leaf, Ypresian Klondike Mountain Formation
- †Ulmeriella
- †Ulmeriella latahensis – type locality for species
- Ulmus[2]
- †Ulmus baileyana - type locality for species[5]
- †Ulmus chuchuanus[63]
- †Ulmus miocenica - type locality for species[3]
- †Ulmus okanaganensis[63]
Ulmus okanaganensis leaf, Ypresian Klondike Mountain Formation - †Ulmus oregoniana[8][2]
- †Ulmus pacifica - type locality for species[3]
- †Ulmus paucidentata[2]
- †Ulmus speciosa[2]
- †Ulteramus – type locality for genus[64]
- †Ulteramus republicensis – type locality for species[64]
- Unamis
- Upogebia
- Urosalpinx
- †Urosalpinx hannibali
- Utricularia
- Uvigerina
- †Uvigerina garzaensis
V
- Venericardia
- †Venericardia castor
- †Venericardia clarki
- †Venericardia hannai
- †Venericardia hornii
- †Venericardia weaveri – or unidentified comparable form
- †Vertipecten
- †Vertipecten fucanus
- Vesicomya
- †Vesicomya chinookensis
- Viburnum[8]
- †Viburnum pugetensis – type locality for species[8]
- †Vinea - type locality for genus[8]
- †Vinea pugetensis – type locality of species[8]
- Vitis
Leaves and fruit of a living Vitis, or grapevine - Volsella
- †Volsella restorationensis
- †Volsella trinominata
W
- †Wessiea[65]
- †Willisia - type locality for genus[8]
- †Willisia rentonensis - type locality for species[8]
- †Whitneyella
- †Whitneyella gabbi
- †Whitneyella markleyensis
- †Whitneyella washingtoniana
- Woodwardia[2][65]
- †Woodwardia aurora - type locality for species[7]
- †Woodwardia clarus - type locality for species[7]
- Woodwardia virginica[65]
X
- Xenoturris
- †Xenoturris antiselli
Y
- Yoldia
- †Yoldia chehalisensis
- †Yoldia clallamensis – type locality for species
- †Yoldia duprei
- †Yoldia newcombi
- †Yoldia olympiana
- †Yoldia reagani
- †Yoldia sammamishensis
- †Yoldia supramontereyensis
Z
- Zannichellia
- †Zannichellia palustris
Living Zannichellia palustris, or horned pondweed
- †Zanthopsis
- †Zanthopsis vulgaris
- †Zarhinocetus
- †Zarhinocetus donnamatsonae – type locality for species
- Zelkova
- †Zingiberopsis
- †Zingiberopsis isonervosa – or unidentified comparable form
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- NW palms
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Uncited entries
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 7 August 2017.
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