List of the Cenozoic life of Montana

This list of the Cenozoic life of Montana contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Montana and are between 66 million and 10,000 years of age.

A

 * Abies fabri in mist.jpg [[Abies]]
 * †Abies alvordensis
 * †Abies concoloroides
 * †Abies laticarpa
 * Acer
 * †Acer bendirei
 * †Acer bolanderi
 * †Acer glabroides
 * †Acer minor
 * †Acer newberryi
 * †Acer oregonianum
 * †Acer scottiae
 * †Acer silberlingi
 * †Acheronodon
 * †Acheronodon garbani – type locality for species
 * Acipenser
 * †Acmeodon
 * Acritohippus isonesus.jpg †[[Acritohippus]]
 * †Acritohippus isonesus
 * †Acritoparamys
 * †Acritoparamys atavus – type locality for species
 * †Actinodonta
 * †Adjidaumo
 * †Adjidaumo intermedius – or unidentified comparable form
 * †Adjidaumo minimus – type locality for species
 * †Adunator
 * †Adunator ladae
 * †Aelurodon
 * †Aelurodon ferox – or unidentified comparable form
 * †Aelurodon montanensis – type locality for species
 * Aepycamelus Alticamelus hharder.jpg †[[Aepycamelus]]
 * †Aepycamelus stocki
 * †Agnotocastor
 * †Agnotocastor montanus
 * †Agriochoerus
 * †Agriochoerus maximus – type locality for species
 * †Agriochoerus minimus
 * †Agrostis
 * †Agrostis primaeva
 * †Ailanthus
 * †Ailanthus americana
 * Alangium
 * †Alangium thomae
 * †Alepidophora
 * †Alepidophora maxima – type locality for species
 * †Alismaphyllites
 * †Alismaphyllites grandifolius
 * Alnus
 * †Alnus jarbidgana
 * †Alnus protomaximowiczii
 * †Alnus relata
 * †Alphagaulus
 * †Alphagaulus pristinus
 * Amebelodon fricki.jpg †[[Amebelodon]]
 * †Amebelodon floridanus – or unidentified comparable form
 * Amelanchier
 * †Amelanchier couleeana
 * †Amelanchier covea
 * †Amentotaxus
 * †Amentotaxus campbelli
 * Amia
 * †Amia fragosa
 * †Amia uintaensis
 * †Ampelopsis
 * †Ampelopsis acerifolia
 * †Amphechinus
 * †Amphechinus horncloudi
 * Amphicyon-ingens reconstruction.jpg †[[Amphicyon]]
 * †Amphicyon riggsi – type locality for species
 * †Amynodon
 * †Amynodon advenus – or unidentified comparable form
 * †Amyzon
 * †Anacodon
 * †Anacodon ursidens – or unidentified comparable form
 * Anas
 * †Anas platyrhynchos – or unidentified comparable form
 * †Ancenycteris
 * †Ancenycteris rasmusseni
 * †Anconodon
 * †Anconodon cochranensis
 * †Anconodon gidleyi – type locality for species
 * †Anemia
 * †Anemia elongata
 * 4-25 Angustidens.jpg]] †Angustidens''
 * †Angustidens vireti – or unidentified comparable form
 * †Anisonchus
 * †Anisonchus oligistus
 * †Anisonchus sectorius
 * †Ansomys
 * †Ansomys hepburnensis – type locality for species
 * †Ansomys nexodens
 * †Antholithes
 * †Antholithes asterias – type locality for species
 * †Antholithes botryanthera – type locality for species
 * †Antholithes divaricanthera – type locality for species
 * †Antholithes explodens – type locality for species
 * †Antholithes glandulifera – type locality for species
 * †Antholithes onagracioides – type locality for species
 * †Antholithes tropaeoloides – type locality for species
 * †Antholithes tulipoidea – type locality for species
 * †Antholithes umbelloidea – type locality for species
 * †Antholithes urnanthera – type locality for species
 * †Antholithes zygomorpha – type locality for species
 * Antilocapra – or unidentified comparable form
 * †Antilocapra americana
 * †Aphelops
 * †Aphronorus
 * †Aphronorus fraudator – type locality for species
 * †Aphronorus orieli
 * †Apternodus
 * †Apternodus baladontus – type locality for species
 * †Apternodus mediaevus – type locality for species
 * †Araceaeites
 * †Araucaria
 * †Araucaria longifolia
 * Cormocyon leptodus.JPG †[[Archaeocyon]]
 * †Archaeocyon leptodus
 * †Archaeohippus
 * †Archaeolagus
 * †Archisyrphus – type locality for genus
 * †Archisyrphus opacus – type locality for species
 * †Arctocyon
 * †Arctocyon ferox
 * ArctodusSimusReconstruct.jpg †[[Arctodus]]
 * †Arctodus simus
 * †Arctostaphylos
 * †Arctostaphylos cuneata
 * †Ardynomys
 * †Ardynomys occidentalis – type locality for species
 * †Arretotherium
 * †Arretotherium acridens – type locality for species
 * Arundo
 * †Arundo pseudogoepperti
 * Arvicola
 * †Arvicola richardsonii
 * †aspera
 * †aspera aspera
 * Astronium balansae.jpg †[[Astronium]]
 * †Astronium truncatum
 * †Athyana
 * †Athyana haydenii
 * †Atoposemys
 * †Atoposemys entopteros
 * †Aulolithomys
 * †Aulolithomys bounites – type locality for species
 * †Averrhoites
 * †Averrhoites affinis
 * †Avunculus
 * †Avunculus didelphodonti – type locality for species
 * †Axestemys
 * †Axestemys montinsana
 * Azolla caroliniana0.jpg [[Azolla]]
 * †Azolla elegans – type locality for species
 * †Azolla fragilis – type locality for species
 * †Azolla velus

B

 * †Baioconodon
 * †Baioconodon denverensis – or unidentified comparable form
 * †Baioconodon engdahli – type locality for species
 * †Baioconodon nordicus – type locality for species
 * †Baiotomeus
 * †Baiotomeus douglassi
 * †Baiotomeus lamberti – type locality for species
 * †Bathygenys
 * †Bathygenys alpha – type locality for species
 * Berberis darwinii shoot.jpg †[[Berberis]]
 * †Berberis acanthoides
 * Berchemia
 * †Berchemia huanoides
 * †Beringiaphyllum
 * †Beringiaphyllum cupanioides
 * †Bessoecetor
 * †Bessoecetor septentrionalis
 * Betula
 * †Betula fairii
 * †Betula stevensoni
 * †Betula thor
 * †Betula vera
 * Bibio – or unidentified related form
 * Bison
 * †Bison bison
 * Bison latifrons fossil buffalo (Pleistocene; North America) 1 (15257877377).jpg †[[Bison latifrons]] – or unidentified comparable form
 * †Bisonalveus
 * †Bisonalveus browni
 * †Blastomeryx
 * †Blastomeryx gemmifer
 * †Bootherium
 * †Borealosuchus
 * †Borealosuchus sternbergii
 * †Brachychampsa
 * Brachycrus.jpg †[[Brachycrus]]
 * †Brachycrus laticeps
 * †Brachyerix
 * †Brachyerix incertis
 * †Brachyrhynchocyon
 * †Brachyrhynchocyon dodgei
 * †Brachyrhynchocyon montanus – type locality for species
 * †Browniea
 * †Browniea serrata

C

 * †Caesalpinites
 * †Caesalpinites acuminatus
 * †Caesalpinites coloradicus
 * †Calycites
 * †Calycites hexaphylla
 * Camelus hesternus Sergiodlarosa.jpg †[[Camelops]]
 * †Camelops minidokae
 * †Camponotites
 * †Canavalia
 * †Canavalia eocenica
 * Canis
 * †Canis latrans
 * †Canis lupus
 * †Canna
 * †Canna flaccidafolia
 * †Carcinodon
 * †Carcinodon aquilonius
 * †Cardiospermum
 * †Cardiospermum terminalis
 * Carpinus
 * †Carpinus fraterna
 * †Carpinus lanceolata
 * †Carpites
 * †Carpites amygdaloides – type locality for species
 * †Carpites carumcarvi – type locality for species
 * †Carpites eludens – type locality for species
 * †Carpites gracilens – type locality for species
 * †Carpites paniculatus – type locality for species
 * †Carpites polygonoides
 * †Carpites pruniformis – type locality for species
 * †Carpites racemosus – type locality for species
 * †Carpites verrucosus
 * †Carpodaptes
 * †Carpodaptes hazelae – type locality for species
 * †Carpodaptes jepseni – tentative report
 * CarpolestesCL.png †[[Carpolestes]]
 * †Carpolestes nigridens – type locality for species
 * Carya
 * †Carya antiquorum
 * †Carya libbeyi
 * †Cassia
 * †Cassia fayettensis
 * †Cassia hesperia
 * †Cassia reticuloides
 * Castanea
 * †Castanea dolichophylla
 * †Castanea intermedia
 * †Castanea miomollissima
 * †Castanea spokanensis
 * †Castanea spolanensis
 * Castor
 * †Castor californicus
 * American Beaver.jpg †[[Castor canadensis]]
 * †Catalpa
 * †Catalpa rubyensis – type locality for species
 * †Catopsalis
 * †Catopsalis alexanderi
 * †Catopsalis waddleae
 * Ceanothus
 * †Ceanothus prespinosus
 * †Ceanothus variabilis
 * Cedrela
 * †Cedrela lancifolia
 * †Cedrela pteraformis
 * †Celastrus
 * †Celastrus typicus
 * Celtis
 * †Celtis aspera
 * †Celtis aspera (Newberry)
 * †Celtis chaneyi
 * †Celtis kansana
 * †Celtis mccoshii
 * †Celtis peracuminata
 * †Centetodon
 * †Centetodon kuenzii – type locality for species
 * †Centetodon magnus
 * Cercidiphyllum
 * †Cercidiphyllum arcticum
 * †Cercidiphyllum articum
 * †Cercidiphyllum crenatum
 * †Cercidiphyllum elongatum
 * †Cercidiphyllum genetrix
 * Red bud 2009.jpg [[Cercis]]
 * †Cercis parvifolia
 * †Cercis spokanensis
 * †Cercocarpus
 * †Cercocarpus antiquus
 * †Cercocarpus beaannae
 * †Cercocarpus myricaefolius
 * †Chadrolagus
 * †Chadrolagus emryi
 * †Chaetoptelea
 * †Chaetoptelea microphylla
 * †Chamaecyparis
 * †Chamaecyparis linguaefolia
 * †Chamops
 * †Chamops segnis – or unidentified comparable form
 * Champsosaurus BW.jpg †[[Champsosaurus]]
 * †Chiromyoides
 * †Chiromyoides potior
 * †Chisternon
 * †Chisternon interpositum – type locality for species
 * †Chriacus
 * †Chriacus baldwini
 * †Chriacus calenancus
 * †Chriacus pelvidens
 * †Chriacus punitor
 * †Chthonophis – type locality for genus
 * †Chthonophis subterraneus – type locality for species
 * †Cimexomys
 * †Cimexomys minor – type locality for species
 * †Cimolestes
 * †Cimolestes incisus
 * Starr 010419 0038 cinnamomum camphora.jpg [[Cinnamomum]]
 * †Cinnamomum sezannense
 * Cissus
 * †Cissus marginata
 * †Claenodon
 * †Claenodon montanensis
 * Clematis
 * †Clematis ellensburgensis
 * Cocculus
 * †Cocculus heteromorpha
 * †Colodon
 * †Colodon cingulatus
 * †Colodon kayi – type locality for species
 * †Colodon woodi – or unidentified comparable form
 * †Colpoclaenus
 * †Colpoclaenus keeferi – tentative report
 * †Colpoclaenus procyonoides – or unidentified comparable form
 * †Colubrina
 * †Colubrina asiatica – or unidentified comparable form
 * †Colubrina preelliptica
 * †Compsemys
 * †Compsemys victa
 * †Coniferites
 * †Coniferites conicus – type locality for species
 * †Coniferites ovatus – type locality for species
 * †Coniferites strobiliformis – type locality for species
 * Coniophis Marsh 1892.png †[[Coniophis]] – or unidentified comparable form
 * †Coniophis precedens
 * †Contogenys
 * †Contogenys ekalakaensis – type locality for species
 * †Contogenys sloani
 * †Conzattia
 * †Conzattia coriacea
 * †Copedelphys
 * †Copedelphys stevensoni – or unidentified comparable form
 * †Copedelphys titanelix – type locality for species
 * †Copemys
 * †Copemys lindsayi – type locality for species
 * †Coriphagus
 * †Coriphagus montanus – type locality for species
 * Cornus
 * †Cornus cornella
 * †Cornus hyperborea
 * †Cornus ovalis
 * †Corylus
 * †Corylus insignis
 * †Coryphodon
 * †Coryphodon proterus – type locality for species
 * †Cosmocomoidea
 * †Cosmocomoidea greenwalti – type locality for species
 * †Cosmocomoidea kootenai – type locality for species
 * †Cosmocomoidea rasnitsyni – type locality for species
 * Cosoryx furcatus pronghorn.jpg †[[Cosoryx]] – tentative report
 * Crataegus
 * †Crataegus elwyni
 * †Crataegus pacifica
 * †Credneria
 * †Credneria daturaefolia
 * Crematogaster
 * †Crematogaster aurora – type locality for species
 * †Crustulus – type locality for genus
 * †Crustulus fontanus – type locality for species
 * †Cryptoryctes – type locality for genus
 * †Cryptoryctes kayi – type locality for species
 * Culiseta
 * †Culiseta kishenehn – type locality for species
 * †Culiseta lemniscata – type locality for species
 * †Cupidinimus
 * †Cupidinimus halli – type locality for species
 * †Cyclurus
 * †Cyclurus fragosus
 * †Cylindrodon – type locality for genus
 * †Cylindrodon fontis – type locality for species
 * †Cynodesmus
 * †Cynodesmus thooides – type locality for species
 * Cynomys
 * Cynomys ludovicianus -Paignton Zoo, Devon, England-8a.jpg †[[Cynomys ludovicianus]]

D

 * †Dalbergia
 * Dalbergia retusa 12zz.jpg †[[Dalbergia retusa]]
 * †Daphoenictis – or unidentified comparable form
 * †Davidia
 * †Davidia antiqua
 * †Davispia – type locality for genus
 * †Davispia bearcreekensis – type locality for species
 * †Derrisemys – type locality for genus
 * †Derrisemys sterea – type locality for species
 * †Desmatochoerus
 * †Desmatochoerus hatcheri – type locality for species
 * †Desmatolagus – tentative report
 * †Deuterogonodon
 * †Deuterogonodon montanus – type locality for species
 * †Diceratherium
 * †Diceratherium annectens
 * †Diceratherium armatum
 * †Diceratherium radtkei – type locality for species
 * †Didymictis
 * †Dillerlemur
 * †Dillerlemur pagei – type locality for species
 * ExtmDinictis1921-029-11.jpg †[[Dinictis]]
 * †Dinohippus
 * †Dioctria – tentative report
 * †Dioctria jamesi – type locality for species
 * †Diospyros
 * †Diospyros oregoniana
 * †Diphysa
 * †Diphysa presuberosa
 * †Diplodipelta – type locality for genus
 * †Diplodipelta reniptera
 * Dipteronia brownii Samara SRIC 01.jpg [[Dipteronia]]
 * †Dipteronia insignis
 * †Dissacus
 * †Dixella
 * †Dixella curvistyla – type locality for species
 * †Dixella eomarginata – type locality for species
 * †Dixella intacta – type locality for species
 * †Dixella spinilobata – type locality for species
 * Dolichoderus
 * †Dolichoderus dlusskyi – type locality for species
 * †Domnina
 * †Domnina gradata – or unidentified comparable form
 * †Domnina thompsoni – type locality for species
 * †Domninoides
 * †Dorraletes
 * †Dorraletes diminutivus
 * †Douglassciurus
 * †Douglassciurus jeffersoni – type locality for species
 * †Downsimus
 * Dromomeryx borealis.jpeg †[[Dromomeryx]]
 * †Dromomeryx borealis
 * †Dryinoides – type locality for genus
 * †Dryinoides oxyrhachis – type locality for species
 * Dryopteris
 * †Dryopteris lakesi
 * †Dryopteris serrata

E

 * Ectocion Ralstonensis.jpg †[[Ectocion]]
 * †Ectocion cedrus
 * †Ectocion collinus
 * †Ectoganus
 * †Ectoganus lobdelli
 * †Ectypodus
 * †Ectypodus aphronorus – type locality for species
 * †Ectypodus laytoni – or unidentified comparable form
 * †Ectypodus lovei
 * †Ectypodus powelli – or unidentified comparable form
 * †Ectypodus szalayi – type locality for species
 * †Ellipsodon
 * †Ellipsodon lemuroides
 * Bothriodon brachyrhynchus.jpg †[[Elomeryx]] – tentative report
 * †Elphidotarsius
 * †Elphidotarsius florencae – type locality for species
 * †Elphidotarsius russelli
 * †Elpidophorus
 * †Elpidophorus elegans
 * †Elpidophorus minor – type locality for species
 * †Entoptychus
 * †Entoptychus montanensis
 * †Eoanaphes – type locality for genus
 * †Eoanaphes stethynioides – type locality for species
 * †Eoanomala – type locality for genus
 * †Eoanomala melas – type locality for species
 * †Eoconodon
 * †Eoconodon hutchisoni
 * †Eoconodon nidhoggi
 * †Eoeustochus – type locality for genus
 * †Eoeustochus borchersi – type locality for species
 * †Eoeustochus kishenehn – type locality for species
 * †Eoformica
 * †Eoformica brevipetiola – type locality for species
 * †Eoformica latimedia – type locality for species
 * †Eoformica pinguis
 * †Eogyropsylla
 * †Eogyropsylla paveloctogenarius – type locality for species
 * †Eolestes
 * †Eolestes ramosus – type locality for species
 * †Eolestes syntheticus
 * †Eotitanops
 * Epicyon haydeni skeleton.jpg †[[Epicyon]]
 * †Epicyon haydeni
 * †Epihippus
 * †Epihippus gracilis – or unidentified comparable form
 * †Epoicotherium
 * †Epoicotherium unicum
 * †Equisetum
 * †Equisetum aquatile – type locality for species
 * †Equisetum arcticum
 * †Equisetum octangulatum
 * Equus
 * Equus conversidens.jpg †[[Equus conversidens]] – or unidentified comparable form
 * †Equus proversus
 * Erucius – tentative report
 * †Erucius lewisi – type locality for species
 * †Eucastor
 * †Eucastor tortus
 * †Eucommia
 * †Eucommia montana
 * †Eucommia serrata
 * †Eudaemonema
 * †Eudaemonema cuspidata – type locality for species
 * †Euhapsis – tentative report
 * †Eumys
 * †Eumys brachyodus
 * †Eumys elegans
 * †Eumys parvidens – or unidentified comparable form
 * Euonymus europaeus.jpg †[[Euonymus]]
 * †Euonymus pacificus
 * †Euoplocyon
 * †Euoplocyon brachygnathus
 * †Euroxenomys
 * †Euroxenomys inconnexus – type locality for species
 * †Eutypomys
 * †Eutypomys inexpectatus – or unidentified comparable form
 * †Eutypomys montanensis – type locality for species
 * †Eutypomys parvus
 * Exbucklandia
 * †Exbucklandia oregonensis
 * Exechia – or unidentified related form
 * †Exostinus
 * †Exostinus lancensis

F

 * †Fagopsis
 * †Fagopsis longifolia
 * Ficus
 * †Ficus affinis
 * †Ficus artocarpoides
 * †Ficus planicostata
 * †Ficus subtruncata
 * Fidiobia
 * Fokienia hodginsii - Kunming Botanical Garden - DSC03140.JPG [[Fokienia]]
 * †Fokienia catenulata
 * Formica
 * †Formica annosa – type locality for species
 * †Fraxinus
 * †Fraxinus brevialata
 * †Fraxinus eocenica
 * †Fraxinus flexifolia
 * †Fraxinus rupinarum

G

 * †Galbreathia
 * †Galbreathia bettae
 * †Gelastops
 * †Gelastops parcus – type locality for species
 * Geochelone
 * †Geochelone primaeva – type locality for species
 * Gerrhonotus – or unidentified comparable form
 * †Gingerichia – type locality for genus
 * †Gingerichia geoteretes – type locality for species
 * Ginkgo
 * Ginkgo adiantoides - G. cranii.jpg †[[Ginkgo adiantoides]]
 * Gleichenia
 * †Gleichenia hesperia
 * Glyptostrobus
 * †Glyptostrobus nordenskioldi
 * †Glyptostrobus oregonensis
 * †Goniacodon
 * †Goniacodon levisanus
 * †Gregorymys
 * †Gregorymys douglassi – type locality for species
 * †Gripholagomys – tentative report

H

 * †Habrosaurus
 * †Habrosaurus dilatus
 * †Hamamelites
 * †Hamamelites inaequalis
 * †Haplaletes
 * †Haplaletes andakupensis
 * †Haplaletes disceptatrix – type locality for species
 * †Haplomylus
 * †Haplomylus palustris – type locality for species
 * †Helaletes
 * †Helaletes nanus
 * †Heliscomys
 * †Heliscomys gregoryi
 * †Heliscomys mcgrewi – or unidentified comparable form
 * †Heliscomys ostranderi
 * Helius
 * †Helius constenius – type locality for species
 * Helodermoides tuberculatus AMNH 11311.jpg †[[Helodermoides]] – type locality for genus
 * †Helodermoides tuberculatus – type locality for species
 * †Hendryomeryx
 * †Hendryomeryx defordi – or unidentified comparable form
 * †Herpetotherium
 * †Herpetotherium fugax
 * †Herpetotherium knighti – or unidentified comparable form
 * †Herpetotherium valens
 * †Hesperhys
 * †Hesperhys vagrans
 * Hesperinus – or unidentified related form
 * Cynodictis.jpg †[[Hesperocyon]]
 * †Hesperocyon gregarius
 * †Heteraletes
 * †Heteraletes leotanus
 * †Hiodon
 * †Hiodon consteniorum – type locality for species
 * Holmskioldia
 * †Holmskioldia speiri
 * †Holopogon
 * †Holopogon archilestes – type locality for species
 * Homo
 * †Homo sapiens
 * Homotherium serum.jpg †[[Homotherium]]
 * †Homotherium serum
 * †Huerfanodon – or unidentified comparable form
 * †Hutchemys – type locality for genus
 * †Hutchemys rememdium – type locality for species
 * †Hyaenodon
 * †Hyaenodon crucians
 * Hydrangea
 * †Hydrangea knowltoni
 * †Hydromystria
 * †Hydromystria expansa
 * †Hyopsodus
 * †Hyopsodus sholemi
 * Hypertragulus calcaratus.JPG †[[Hypertragulus]]
 * †Hypertragulus calcaratus
 * †Hypisodus
 * †Hypisodus minimus
 * †Hypohippus
 * †Hypohippus osborni – or unidentified comparable form
 * †Hypolagus
 * †Hypolagus vetus
 * †Hypsiops
 * †Hypsiops breviceps – type locality for species
 * †Hyrachyus
 * †Hyrachyus douglassi – type locality for species
 * †Hyracodon
 * †Hyracodon medius
 * †Hyracodon priscidens

I

 * †Ictidopappus
 * †Ictidopappus mustelinus – type locality for species
 * †Ignacius
 * †Ignacius frugivorus
 * †Ilex
 * †Ilex acuminata – later renamed Ilex mormonica
 * †Ilex mormonica – type locality for species. Formerly known as Ilex acuminata.
 * †Intyrictis
 * †Intyrictis vanvaleni
 * †Ischyrhiza – or unidentified comparable form
 * †Ischyrhiza avonicola
 * Ischyromys.jpg †[[Ischyromys]]
 * †Ischyromys douglassi – type locality for species
 * †Ischyromys typus
 * †Ischyromys veterior – type locality for species
 * Isoetes
 * †Isoetes trullata – type locality for species
 * †Isoetites
 * †Isoetites horridus
 * Isonychia
 * †Isonychia alderensis – type locality for species

J

 * †Jepsenella – type locality for genus
 * †Jepsenella praepropera – type locality for species
 * †Judithemys
 * †Judithemys backmani
 * †Juglandicarya
 * †Juglandiphyllites
 * †Juglandiphyllites glabra
 * Juglans
 * Noyer centenaire en automne.JPG †[[Juglans regia]] – or unidentified comparable form
 * †Juglans taurina
 * Juniperus
 * †Juniperus nevadensis

K

 * †Kerria
 * †Kerria antiqua
 * †Kimbetohia
 * †Kimbetohia mziae
 * Koelreutheria-paniculata.JPG [[Koelreuteria]]
 * †Koelreuteria arnoldi
 * †Koelreuteria bipinnatoides
 * †Ktunaxia – type locality for genus
 * †Ktunaxia jucunda – type locality for species
 * †Kukusepasutanka
 * †Kukusepasutanka schultzi

L

 * †Labidolemur – type locality for genus
 * †Labidolemur kayi – type locality for species
 * Lasius
 * †Lasius glom – type locality for species
 * †Lastrea
 * †Lastrea goldiana
 * †Latiblattella
 * †Latiblattella avita – type locality for species
 * †Laurophyllum
 * †Laurophyllum perseanum
 * Fanal Madeira 2016 2.jpg [[Laurus]]
 * †Laurus socialis
 * †Leguminosites
 * †Leidymys
 * †Leipsanolestes
 * †Leipsanolestes siegfriedti
 * Lemmiscus
 * †Lemmiscus curtatus
 * Lepisosteus
 * †Lepisosteus occidentalis
 * †Leptacodon
 * †Leptacodon munusculum – type locality for species
 * †Leptacodon packi – or unidentified comparable form
 * †Leptacodon proserpinae
 * †Leptacodon tener
 * †Leptarctus – type locality for genus
 * †Leptarctus primus – type locality for species
 * †Leptauchenia
 * †Leptauchenia decora
 * †Leptauchenia major
 * †Leptictis
 * †Leptochoerus
 * †Leptocyon
 * †Leptocyon douglassi – type locality for species
 * †Leptodontomys
 * Leptomeryx BW.jpg †[[Leptomeryx]]
 * †Leptomeryx esulcatus
 * †Leptomeryx evansi
 * †Leptomeryx mammifer
 * †Leptomeryx speciosus
 * †Leptomeryx yoderi – or unidentified comparable form
 * †Leptonysson – type locality for genus
 * †Leptonysson basiliscus – type locality for species
 * †Leptoreodon
 * †Leptoreodon marshi
 * †Leucaena
 * †Leucaena californica
 * †Lignimus
 * †Limnenetes
 * †Limnenetes platyceps – type locality for species
 * †Limnoecus
 * Lindera
 * †Lindera obtusata
 * †Lisserpeton
 * †Lisserpeton bairdi
 * †Litaletes
 * †Litaletes disjunctus – type locality for species
 * Lithornis.png †[[Lithornis]]
 * †Lithornis celetius – type locality for species
 * †Litocherus
 * †Litocherus lacunatus
 * †Litocherus notissimus – type locality for species
 * †Litomylus
 * †Litomylus dissentaneus – type locality for species
 * †Litomylus ishami – or unidentified comparable form
 * †Litomylus orthronepius
 * †Loxolophus
 * †Loxolophus pentacus
 * †Loxolophus schizophrenus
 * †Lutetialestes – type locality for genus
 * †Lutetialestes uniformis – type locality for species
 * Lynx
 * Calero Creek Trail Bobcat.jpg †[[Lynx rufus]]

M

 * †Machaerosaurus
 * †Machaerosaurus torrejonensis
 * Sweetbay Magnolia Magnolia virginiana Flower Closeup 2146px.jpg [[Magnolia]]
 * †Magnolia borealis
 * †Magnolia magnifolia
 * Mahonia
 * †Mahonia hakeaeformis
 * †Mahonia limirivuli
 * †Mahonia lobodonta
 * †Mahonia obliqua
 * †Mahonia retculata
 * †Mahonia reticulata
 * †Mahonia simplex
 * †Mahonia subdenticulata
 * †Mammut
 * †Mammut americanum
 * †Mammuthus
 * †Mammuthus columbi
 * MammothVsMastodon.jpg, or American mastodon (right), and a Mammuthus primigenius, or wooly mammoth (left)]] †Mammuthus primigenius''
 * Marchantia
 * †Marchantia lignitica
 * †Marchantia pealei
 * Marmota
 * †Marmota flaviventria
 * †Marquettia
 * †Marquettia metzeli – type locality for species
 * Martes
 * †Martes kinseyi – or unidentified comparable form
 * †Mcconichthys – type locality for genus
 * †Mcconichthys longipinnis – type locality for species
 * Titanotherium cropped.png †[[Megacerops]]
 * †Megacerops kuwagatarhinus – type locality for species
 * †Megahippus
 * †Megalagus
 * †Megalagus brachyodon – type locality for species
 * †Megalagus dawsoni – type locality for species
 * †Megalagus turgidus – or unidentified comparable form
 * †Megalonyx
 * †Megalonyx jeffersonii
 * †Megantereon
 * †Megatylopus
 * †Megatylopus gigas
 * †Melastomites
 * †Melastomites montanensis
 * †Meniscomys
 * †Menodus
 * †Merriamoceros
 * †Merychippus
 * †Merychippus sejunctus
 * †Merychyus
 * †Merychyus arenarum – or unidentified comparable form
 * †Merychyus smithi
 * †Merycochoerus
 * †Merycochoerus chelydra
 * Merycodus cf. nectatus - National Museum of Natural History - IMG 2024.JPG †[[Merycodus]]
 * †Merycodus necatus – or unidentified comparable form
 * †Merycoides
 * †Merycoides longiceps
 * †Merycoidodon
 * †Merycoidodon culbertsoni – or unidentified comparable form
 * †Mesodma
 * †Mesodma ambigua – or unidentified comparable form
 * †Mesodma formosa
 * †Mesodma garfieldensis – type locality for species
 * †Mesodma pygmaea – type locality for species
 * †Mesodma thompsoni
 * †Mesogaulus
 * †Mesogaulus ballensis – type locality for species
 * †Mesogaulus douglassi
 * †Mesohippus
 * †Mesohippus bairdi
 * †Mesohippus westoni – type locality for species
 * Mesoreodonskull.jpg mammal Mesoreodon]] †Mesoreodon
 * †Mesoreodon chelonyx
 * †Mesoreodon minor – type locality for species
 * †Mesoscalops
 * †Mesoscalops montanensis – type locality for species
 * †Metadjidaumo
 * Metasequoia
 * †Metasequoia occidentalis
 * †Metopium
 * †Metopium metopioides
 * Miacis cropped.png †[[Miacis]] – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Microcosmodon
 * †Microcosmodon harleyi – type locality for species
 * †Micropternodus
 * †Micropternodus borealis – type locality for species
 * Microtus
 * †Microtus pennsylvanicus – or unidentified comparable form
 * †Mimatuta
 * †Mimatuta minuial
 * †Mimatuta morgoth – type locality for species
 * †Mimetodon
 * †Mimetodon silberlingi – type locality for species
 * †Mimosites
 * †Mimosites acaciafolius
 * †Mimotricentes
 * †Mimotricentes fremontensis
 * †Mimotricentes tedfordi – tentative report
 * †Minerisporites
 * †Minerisporites glossoferus (Dijkstra) n. comb.
 * †Miniochoerus – tentative report
 * Miohippus cropped.jpg †[[Miohippus]] – type locality for genus
 * †Miohippus anceps – tentative report
 * †Miohippus annectens – tentative report
 * †Miohippus equiceps – tentative report
 * †Miohippus gemmarosae – or unidentified comparable form
 * †Miohippus grandis
 * †Miohippus obliquidens
 * †Miohippus taxus – type locality for species
 * †Mionictis – tentative report
 * †Miopsyche – tentative report
 * †Miopsyche rubiensis – type locality for species
 * †Mnium
 * †Mnium montanense
 * †Mojavemys
 * †Monosaulax
 * †Monosaulax pansus – tentative report
 * †Montanatylopus
 * †Montanatylopus matthewi – type locality for species
 * †Mookomys
 * †Mookomys formicarum – or unidentified comparable form
 * †Mookomys thrinax – type locality for species
 * Morus
 * †Muscites
 * †Muscites gracilens
 * Mustela
 * †Mustela frenata
 * †Mustelavus
 * †Mustelavus priscus
 * Myrica
 * †Myrica lignitum
 * †Myrica mormonensis
 * †Myrica serrulata
 * †Myrmecoboides
 * †Myrmecoboides montanensis – type locality for species
 * †Myrtophyllum
 * †Myrtophyllum torreyi
 * †Mystipterus
 * †Mytonolagus
 * †Mytonolagus petersoni – or unidentified comparable form

N

 * †Namatomys
 * †Namatomys lloydi – type locality for species
 * †Nannodectes
 * †Nannodectes gidleyi – or unidentified comparable form
 * †Nannodectes intermedius
 * †Nannodectes simpsoni – or unidentified comparable form
 * †Nanodelphys
 * †Nanodelphys hunti
 * †Nanotragulus
 * †Navajovius
 * †Nelumbago
 * †Nelumbago montanum
 * †Nelumbo
 * Neohipparion cropped.png †[[Neohipparion]]
 * †Neoplagiaulax
 * †Neoplagiaulax donaldorum – type locality for species
 * †Neoplagiaulax grangeri – type locality for species
 * †Neoplagiaulax hunteri – type locality for species
 * †Neoplagiaulax kremnus
 * †Neoplagiaulax mckennai
 * †Neoplagiaulax nelsoni – type locality for species
 * †Niglarodon
 * †Niglarodon blacki – type locality for species
 * †Niglarodon koerneri – type locality for species
 * †Niglarodon loneyi – type locality for species
 * †Niglarodon progressus
 * †Nordenskioldia
 * †Nordenskioldia borealis
 * Nuphar subintegerrimum and bee.JPG †[[Nuphar]]
 * †Nuphar advenoides
 * †Nyctitherium
 * †Nymphaeites
 * †Nymphaeites nevadensis
 * †Nyssa
 * †Nyssa alata
 * †Nyssa borealis
 * †Nyssa crenata

O

 * †Ocajila
 * †Ocajila makpiyahe – or unidentified comparable form
 * †Odaxosaurus
 * †Odaxosaurus piger
 * White-tailed deer.jpg [[Odocoileus]] – or unidentified comparable form
 * †Ogmophis
 * †Ogmophis arenarum – type locality for species
 * Olar
 * †Olar buccinator
 * †Oligodontosaurus
 * †Oligodontosaurus wyomingensis – or unidentified comparable form
 * †Oligoryctes
 * †Oligoryctes altitalonidus
 * †Oligoryctes cameronensis
 * †Oligoscalops
 * †Oligotheriomys
 * †Oligotheriomys senrudi
 * Muskrat Foraging.JPG [[Ondatra]]
 * †Ondatra xibethicus
 * †Ondatra zibethicus
 * †Onoclea
 * †Onoclea hesperia
 * †Onychodectes
 * †Onychodectes tisonensis
 * †Opisthotriton
 * †Opisthotriton gidleyi – type locality for species
 * †Opisthotriton kayi
 * Oreohelix
 * †Oreolagus
 * †Oreolagus nevadensis
 * †Oreonetes
 * †Oreonetes anceps
 * †Oreonetes douglassi
 * †Osmanthus
 * †Osmanthus praemissa
 * OsmundaRegalis.jpg †[[Osmunda]]
 * †Osmunda greenlandica
 * †Osmunda macrophylla
 * †Osmunda occidentalis
 * Ostrya
 * †Ostrya oregoniana
 * †Otarocyon
 * †Otarocyon macdonaldi
 * †Oxyacodon
 * †Oxyacodon apiculatus
 * †Oxyacodon ferronensis
 * †Oxyacodon marshater
 * †Oxyclaenus
 * †Oxyclaenus pugnax
 * Oxydactylus longipes.jpg †[[Oxydactylus]]
 * †Oxydactylus lacota – or unidentified comparable form
 * †Oxyprimus
 * †Oxyprimus erikseni – type locality for species

P

 * †Paciculus
 * †Pagonomus – or unidentified comparable form
 * †Palaechthon – type locality for genus
 * †Palaechthon alticuspis – type locality for species
 * †Palaechthon woodi – or unidentified comparable form
 * †Palaeictops
 * †Palaeocarpinus
 * †Palaeogale
 * †Palaeogale sectoria
 * †Palaeohypnum
 * †Palaeohypnum beckeri
 * †Palaeolabrus
 * †Palaeolabrus montanensis – or unidentified comparable form
 * Palaeolagus NT small.jpg relative Palaeolagus]] †Palaeolagus
 * †Palaeolagus burkei
 * †Palaeolagus haydeni
 * †Palaeolagus hypsodus
 * †Palaeolagus intermedius
 * †Palaeolagus temnodon – type locality for species
 * †Palaeophytocrene
 * †Palaeoryctes
 * †Palaeosinopa
 * †Palaeosinopa didelphoides – or unidentified comparable form
 * Palaeosyops leidyi.JPG †[[Palaeosyops]]
 * †Palaeosyops fontinalis
 * †Palaeoxantusia
 * †Palaeoxantusia fera
 * †Palatobaena
 * †Palatobaena bairdi
 * †Palenochtha – type locality for genus
 * †Palenochtha minor – type locality for species
 * †Paleonelumbo
 * †Paleonelumbo macroloba
 * †Paleonuphar
 * †Paleonuphar hesperium
 * †Paleopsephurus – or unidentified comparable form
 * †Paleotomus
 * †Paleotomus senior – type locality for species
 * Paliurus spina-christi 4.jpg [[Paliurus]]
 * †Paliurus dumosus
 * †Paliurus florissanti
 * †Pandemonium
 * †Pandemonium dis – type locality for species
 * †Pantolambda
 * †Pantolambda intermedius – type locality for species
 * †Pantomimus – type locality for genus
 * †Pantomimus leari – type locality for species
 * †Paracosoryx
 * †Paradjidaumo
 * †Paradjidaumo spokanensis – type locality for species
 * †Paradjidaumo trilophus
 * †Paramerychyus
 * †Paramerychyus harrisonensis
 * San Diego Paramylodon.jpg Paramylodon]] †Paramylodon
 * †Paramylodon harlani
 * †Paramys
 * †Paramys relictus
 * †Paranymphaea
 * †Paranymphaea crassifolia
 * †Parapliosaccomys
 * †Parapliosaccomys annae – or unidentified comparable form
 * †Pararyctes
 * †Pararyctes pattersoni
 * †Paratomarctus
 * †Paratomarctus temerarius
 * †Parectypodus
 * †Parectypodus sinclairi – type locality for species
 * †Parectypodus sylviae
 * †Pareumys – tentative report
 * †Parictis
 * †Parictis montanus
 * †Paromomys
 * †Paromomys depressidens – type locality for species
 * †Paromomys maturus – type locality for species
 * †Parthenocissus
 * †Parthenocissus ursina
 * †Parvericius
 * †Parvericius montanus
 * †Paulownia
 * †Paulownia columbiana
 * †Paulownia thomsoni
 * Peltosaurus.JPG †[[Peltosaurus]]
 * †Pelycomys
 * †Penetrigonias
 * †Penetrigonias dakotensis
 * †Penosphyllum
 * †Penosphyllum cordatum
 * Penthetria
 * †Penthetria abacula – type locality for species
 * †Penthetria alderensis – type locality for species
 * †Penthetria rubiensis – type locality for species
 * †Peraceras
 * †Peraceras profectum
 * †Peraceras superciliosum
 * †Peradectes
 * †Peradectes elegans – or unidentified comparable form
 * †Peradectes minor – type locality for species
 * †Peradectes protinnominatus – or unidentified comparable form
 * †Peridiomys
 * †Peridiomys halis – type locality for species
 * †Periptychus
 * †Perognathoides
 * †Perognathoides eurekensis – or unidentified comparable form
 * Perognathus
 * †Perognathus ancenensis – type locality for species
 * Peromyscus
 * †Peromyscus maniculatus – or unidentified comparable form
 * Persea
 * †Persea brossiana
 * †Petauristodon
 * †Phasmatopelecinus – type locality for genus
 * †Phasmatopelecinus leonae – type locality for species
 * †Phenacodaptes – or unidentified comparable form
 * †Phenacodaptes sabulosus
 * Knight Phenacodus.jpg †[[Phenacodus]]
 * †Phenacodus bisonensis
 * †Phenacodus intermedius
 * †Phenacodus magnus
 * Phragmites
 * †Phragmites alaskana
 * †Phthiria
 * †Phthiria fossa – type locality for species
 * †Phyllites
 * †Phyllites demoresi
 * †Phyllites disturbans
 * Picea
 * †Picea lahontensis
 * †Picea magna
 * †Picea sonomensis
 * †Piceoerpeton
 * †Piceoerpeton willwoodense
 * †Picrodus
 * †Picrodus canpacius
 * †Picrodus silberlingi – type locality for species
 * Pinus densiflora Kumgangsan.jpg [[Pinus]]
 * †Pinus florissanti
 * †Pinus wheeleri
 * †Pipestoneia – type locality for genus
 * †Pipestoneia douglassi – type locality for species
 * †Pipestoneomys
 * †Pipestoneomys bisulcatus
 * †Pithecolobium
 * †Pithecolobium eocenicum
 * †Planatus
 * †Planatus nobilis
 * †Planatus raynoldsi
 * †Planetetherium
 * †Planetetherium mirabile – type locality for species
 * †Plastomenoides – type locality for genus
 * †Plastomenoides lamberti – type locality for species
 * †Plastomenoides tetanetron – type locality for species
 * †Plastomenus – or unidentified comparable form
 * Platanus
 * †Platanus dissecta
 * †Platanus nobilis
 * †Platanus raynoldsi
 * †Platanus raynoldsii
 * †Platanus stenoloba
 * Plecia
 * †Plecia inflata – type locality for species
 * Plesiadapis NT.jpg †[[Plesiadapis]]
 * †Plesiadapis anceps – type locality for species
 * †Plesiadapis churchilli – type locality for species
 * †Plesiadapis praecursor – type locality for species
 * †Plesiadapis rex – type locality for species
 * †Plesiolestes
 * †Plesiolestes problematicus
 * †Pleurolicus
 * †Plioceros
 * †Plioceros blicki – or unidentified comparable form
 * †Pliohippus
 * †Plionictis
 * †Plionictis ogygia
 * †Plithocyon
 * †Plithocyon ursinus
 * †Poacites
 * †Poebrotherium
 * †Poebrotherium eximium – or unidentified comparable form
 * †Poebrotherium wilsoni
 * Pogonodon platycopis.jpg †[[Pogonodon]]
 * †Ponerites
 * †Ponerites kishenehne – type locality for species
 * Populus
 * †Populus adamantea
 * †Populus balsamoides
 * †Populus cedrusensis
 * †Populus cinnamomoides
 * †Populus eotremuloides
 * †Populus lindgreni
 * †Populus nebrascensis
 * †Populus payettensis
 * †Populus washoensis
 * †Potamanthellus
 * †Potamanthellus rubiensis – type locality for species
 * †Potentilla
 * †Potentilla horkelioides
 * †Potentilla salmonensis
 * †Pradjidaumo
 * †Pradjidaumo trilophus
 * †Preissites
 * †Preissites wardi
 * †Preissites wardii
 * †Procerberus
 * †Procerberus formicarum – type locality for species
 * †Procerberus grandis – or unidentified comparable form
 * †Procerberus plutonis
 * †Prochetodon
 * †Prochetodon foxi – type locality for species
 * †Prodesmodon
 * †Prodesmodon copei
 * †Prodiacodon
 * †Prodiacodon concordiarcensis – type locality for species
 * †Prodiacodon crustulum – type locality for species
 * †Prodiacodon furor – type locality for species
 * Proiridomyrmex rotundatus specimen.png †[[Proiridomyrmex]]
 * †Proiridomyrmex rotundatus – type locality for species
 * †Prokalotermes
 * †Prokalotermes alderensis – type locality for species
 * †Promerycochoerus
 * †Promerycochoerus superbus
 * †Promioclaenus
 * †Promioclaenus acolytus
 * †Pronodens
 * †Pronodens silberlingi – type locality for species
 * †Pronothodectes
 * †Pronothodectes matthewi – type locality for species
 * †Propalaeosinopa
 * †Propalaeosinopa albertensis
 * †Proscalops
 * †Proscalops intermedius – type locality for species
 * †Prosciurus
 * †Prosciurus parvus – or unidentified comparable form
 * †Prosciurus vetustus – type locality for species
 * †Prosphyracephala
 * †Prosphyracephala rubiensis – type locality for species
 * Bmnhp27347 p 1 high.jpg †[[Protazteca]]
 * †Protazteca eocenica – type locality for species
 * †Protentomodon
 * †Protentomodon ursirivalis – type locality for species
 * †Prothryptacodon
 * †Prothryptacodon furens – type locality for species
 * †Protictis
 * †Protictis haydenianus
 * †Protictis microlestes
 * †Protochriacus
 * †Protochriacus simplex
 * Protohippus simus.jpg †[[Protohippus]]
 * †Protolabis
 * †Protolabis gracilis – or unidentified comparable form
 * †Protoreodon
 * †Protoreodon pearcei
 * †Protoreodon pumilus
 * †Protungulatum
 * †Protungulatum donnae
 * †Protungulatum gorgun – type locality for species
 * †Protungulatum sloani – type locality for species
 * †Provaranosaurus – or unidentified comparable form
 * †Proxestops
 * †Proxestops silberlingi
 * †Proxestops silberlingii – type locality for species
 * Prunus
 * †Prunus careyhurstia
 * †Prunus corrugis
 * †Prunus lyoniifolia – type locality for species
 * †Prunus morangensis
 * †Prunus perita
 * †Prunus scottii
 * †Prunus wilcoxiana
 * Pseudohipparion retrusus.JPG †[[Pseudhipparion]]
 * †Pseudocylindrodon
 * †Pseudocylindrodon medius – type locality for species
 * †Pseudocylindrodon neglectus – type locality for species
 * †Pseudolarix
 * †Pseudolarix americana
 * †Pseudomesoreodon – type locality for genus
 * †Pseudomesoreodon rooneyi – type locality for species
 * Pseudomyrmex
 * †Pseudomyrmex saxulum – type locality for species
 * †Pseudotettigonia
 * †Pseudotettigonia leona – type locality for species
 * †Pseudotheridomys
 * †Pseudotrimylus
 * †Pseudotsuga
 * †Pseudotsuga longifolia
 * †Pseudotsuga sonomensis
 * Psittacotherium multifragumDB24.jpg]] †Psittacotherium''
 * †Psittacotherium multifragum
 * Ptelea
 * †Ptelea miocenica
 * †Ptenidium
 * †Ptenidium kishenehnicum – type locality for species
 * Pteris
 * Pterocarya
 * †Pterocarya hispida
 * †Ptilodus
 * †Ptilodus kummae
 * †Ptilodus montanus – type locality for species
 * †Ptilodus tsosiensis
 * Purgatorius BW.jpg †[[Purgatorius]]
 * †Purgatorius janisae – type locality for species
 * †Purgatorius titusi – type locality for species
 * †Purgatorius unio – type locality for species
 * †Pyracantha
 * †Pyracantha spatulata – type locality for species

Q

 * Eiche bei Schönderling, 2.jpg [[Quercus]]
 * †Quercus convexa
 * †Quercus dayana
 * †Quercus dispersa – tentative report
 * †Quercus eoprinus
 * †Quercus hannibali
 * †Quercus prelobata
 * †Quercus prevariabilis
 * †Quercus pseudolyrata
 * †Quercus simulata
 * †Quercus sullyi
 * †Quercus winstanleyi

R

 * †Rana – or unidentified comparable form
 * Rangifer
 * Reinbukken på frisk grønt beite. - panoramio cropped.jpg †[[Rangifer tarandus]]
 * †Rhamnites
 * †Rhamnites pseudostenophyllus
 * †Rhamnus
 * †Rhamnus cleburni
 * †Rhamnus crocea
 * †Rhamnus hirsuta
 * Rhus
 * †Rhus milleri
 * †Rhus miosuccedanea
 * †Rhus obscura
 * †Rhus praeovata
 * †Rhus stellariaefolia
 * †Robinia
 * †Robinia californica
 * †Robinia lesquereuxi
 * Rosa
 * †Rosa hilliae

S

 * Sabal
 * †Sabal grayana
 * †Sabal imperialis
 * †Sabal powelli
 * †Saccoloma
 * †Saccoloma gardneri
 * Salix alba Morton.jpg [[Salix]]
 * †Salix aquilina
 * †Salix cockerelli
 * †Salix hesperia
 * †Salix knowltoni
 * †Salix laevigatoides
 * †Salix longiacuminata
 * †Salix schimperi
 * †Salix stipulata – type locality for species
 * †Salix succorensis
 * †Salix taxifolioides
 * †Salix truckeana
 * †Salix wildcatensis
 * †Salix wimmeriana
 * †Sambucus
 * †Sambucus newtoni
 * †Sapindus
 * †Sapindus coloradensis
 * Sassafras
 * †Sassafras ashleyi
 * †Sassafras columbiana
 * Sassafras hesperia 01.jpg †[[Sassafras hesperia]]
 * †Sassafras thermale
 * †Scalopoides
 * †Scapherpeton
 * †Scapherpeton tectum
 * †Scaphohippus
 * †Scaphohippus intermontanus – or unidentified comparable form
 * †Scenopagus
 * †Schizotheriodes
 * †Schizotheriodes parvus – type locality for species
 * †Scotiophryne – or unidentified comparable form
 * †Scottimus
 * †Scottimus longiquus – type locality for species
 * †Scottimus viduus
 * †Selaginella
 * †Selaginella collieri
 * †Selaginella monstrosa
 * †Senoprosopis
 * †Senoprosopis beckeri – type locality for species
 * Sequoia
 * Sequoia affinis SR 95-07-06 01.jpg †[[Sequoia affinis]]
 * †Sespemys – tentative report
 * †Simoedosaurus
 * †Simpson
 * †Simpson lists
 * †Simpsonictis
 * †Simpsonictis tenuis
 * †Smilax
 * †Smilax trinervis
 * †Solenopsites
 * †Solenopsites abdita – type locality for species
 * †Sophora
 * †Sophora spokanensis
 * †Sorbus
 * †Sorbus harneyensis
 * †Sparganium
 * †Sparganium antiquum
 * Spea
 * †Spea neuter
 * Spermophilus
 * †Spermophilus jerae – type locality for species
 * †Spermophilus primitivus
 * †Spermophilus richardsonii
 * †Spiraea
 * †Spiraea clavidens
 * †Spiraea decurrens
 * †Stelocyon
 * †Stelocyon arctylos – type locality for species
 * †Steneofiber
 * †Steneofiber gradatus – or unidentified comparable form
 * †Steneofiber hesperus
 * †Stenoechinus
 * †Stenoechinus tantalus – type locality for species
 * Stenomylus.jpg †[[Stenomylus]]
 * †Stenomylus hitchcocki – or unidentified comparable form
 * Sterculia
 * †Sterculia wilcoxiana
 * †Stibarus
 * †Stibarus montanus – type locality for species
 * †Stilpnodon
 * †Stilpnodon simplicidens – type locality for species
 * †Stygimys
 * †Stygimys camptorhiza – or unidentified comparable form
 * †Stygimys gratus
 * †Stygimys jepseni – type locality for species
 * †Stygimys kuszmauli – type locality for species
 * Dromomeryx cropped.jpg †[[Subdromomeryx]]
 * †Subdromomeryx antilopinus
 * †Subhyracodon
 * †Subhyracodon mitis
 * †Subhyracodon occidentalis
 * †Submerycochoerus
 * †Submerycochoerus bannackensis – type locality for species
 * Sylvicola – or unidentified related form
 * †Sylvicola fenestralis
 * Sylvilagus
 * †Sylvilagus nuttallii
 * †Symplocarpus
 * †Symplocarpus prefoetidus

T

 * Taeniolabis taoensis.jpg †[[Taeniolabis]]
 * †Taeniolabis lamberti – type locality for species
 * †Tapocyon
 * †Tapocyon robustus
 * †Tardontia
 * †Tardontia occidentale – or unidentified comparable form
 * Taricha
 * †Taricha miocenica – type locality for species
 * Taxodium
 * †Taxodium dubium
 * †Taxodium olriki
 * †Tectochara
 * †Tectochara grambastorum
 * Teleoceras Horsfall cropped.jpg †[[Teleoceras]]
 * †Tenudomys – tentative report
 * †Tephrodytes – type locality for genus
 * †Tephrodytes brassicarvalis – type locality for species
 * †Ternstroemites
 * †Ternstroemites aureavallis
 * †Tetraclaenodon
 * †Tetraclaenodon puercensis
 * Thomomys
 * †Thomomys taloides
 * Thomomys talpoides.jpg †[[Thomomys talpoides]]
 * †Thrinax
 * †Thrinax dorfi
 * †Thryptacodon
 * †Thryptacodon australis – or unidentified comparable form
 * †Thryptacodon orthogonius – tentative report
 * †Thryptacodon pseudarctos – type locality for species
 * †Thuja
 * †Thuja dimorpha
 * †Thuja interrupta
 * †Thylacodon
 * †Thylacodon montanensis – type locality for species
 * †Thylacodon pusillus – or unidentified comparable form
 * †Ticholeptus
 * †Ticholeptus zygomaticus
 * Tilia
 * †Tilia aspera
 * †Tilia inaequalis
 * †Tinuviel
 * †Tinuviel eurydice
 * Tipula
 * †Tipula carolae – type locality for species
 * †Tipula rubiensis – type locality for species
 * Titanoides primaevus.jpg †[[Titanoides]]
 * †Titanoides gidleyi
 * †Trapa
 * †Trapa angulata
 * †Trapa paulula
 * †Tricentes
 * †Tricentes subtrigonus
 * †Trigenicus
 * †Trigenicus profectus
 * †Trigonias
 * †Trigonias osborni
 * †Trilaccogaulus
 * †Trilaccogaulus montanensis
 * †Triplopides
 * †Triplopides rieli – type locality for species
 * †Triplopus
 * †Triplopus rhinocerinus – or unidentified comparable form
 * †Trochodendroides
 * †Trochodendroides flabella
 * †Trogolemur – tentative report
 * †Tropidia
 * †Tropidia tumulata – type locality for species
 * †Tullochelys
 * †Tullochelys montana
 * †Tylocephalonyx
 * Typha
 * †Typha lesquereuxi

U

 * †Ulmeriella
 * †Ulmeriella rubiensis – type locality for species
 * East Coker elm, 2.jpg [[Ulmus]]
 * †Ulmus montanensis
 * †Ulmus moorei
 * †Ulmus paucidentata
 * †Ulmus rhamnifolia
 * †Ulmus speciosa
 * †Unuchinia
 * †Unuchinia asaphes – type locality for species
 * †Ursolestes – type locality for genus
 * †Ursolestes perpetior – type locality for species
 * Ursus

V

 * Vaccinium.jpg †[[Vaccinium]]
 * †Vaccinium sophoroides
 * †Valenopsalis
 * †Valenopsalis joyneri – type locality for species
 * †Vauquelinia
 * †Vauquelinia coloradensis
 * †Vauquelinia coloradica
 * †Viburnum
 * †Viburnum antiquorum
 * †Viburnum kraeuseli
 * †Viguiera
 * †Viguiera cronquisti
 * Vitis californica with grapes.jpg [[Vitis]]
 * †Vitis lobata
 * †Vitis muscadinioides
 * †Vitis olriki
 * †Vitis washingtonensis
 * †Viverravus – tentative report

W

 * †Wilsoneumys
 * Wradicans.jpg †[[Woodwardia]]
 * †Woodwardia arctica
 * †Wortmania – or unidentified comparable form

X

 * †Xyronomys

Z

 * Zelkova serrata6.jpg [[Zelkova]]
 * †Zelkova drymeja
 * †Zelkova hesperia
 * †Zelkova krymeja
 * †Zelkova nervosa
 * †Zelkova oregoniana
 * †Zelkova planeroides
 * †Zelkova ungeri
 * †Zeunerella – tentative report
 * †Zeunerella lewisi – type locality for species
 * †Zygodactylus
 * †Zygodactylus ochlurus – type locality for species