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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{{Compact ToC}}- 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
- †Acritoparamys
- †Acritoparamys atavus – type locality for species
- †Actinodonta
- †Adjidaumo
- †Adjidaumo intermedius – or unidentified comparable form
- †Adjidaumo minimus – type locality for species
- †Adunator
- {{multiple image
| total_width = 330 | image1 = Aelurodon taxoides.JPG | alt1 = | image2 = Aepycamelus Alticamelus hharder.jpg | alt2 = | image3 = Agriochoerus.jpg | alt3 = | footer = Left: Fossilized skull of the Miocene bone-crushing dog Aelurodon. Middle: Life restoration of the Miocene camel Aepycamelus, or the long-necked camel. Heinrich Harder (1920). Right: Life restoration of the Eocene-Oligocene even-toed ungulate Agriochoerus.}} †Aelurodon - †Aelurodon ferox – or unidentified comparable form
- †Aelurodon montanensis – type locality for species
- †Aepycamelus
- †Agnotocastor
- †Agriochoerus
- †Agriochoerus maximus – type locality for species
- †Agriochoerus minimus
- †Agrostis
- †Ailanthus
- Alangium
- †Alepidophora
- †Alepidophora maxima – type locality for species
- †Alismaphyllites
- †Alismaphyllites grandifolius
- Alnus
- †Alnus jarbidgana
- †Alnus protomaximowiczii
- †Alnus relata
- †Alphagaulus
- †Amebelodon
- †Amebelodon floridanus – or unidentified comparable form
- Amelanchier
- †Amelanchier couleeana
- †Amelanchier covea
- †Amentotaxus
- Amia
- †Amia fragosa
- †Amia uintaensis
- †Ampelopsis
- †Amphechinus
- †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
- †Anconodon
- †Anconodon cochranensis
- †Anconodon gidleyi – type locality for species
- †Anemia
- †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
- {{multiple image
| total_width = 248 | image1 = Antilocapra americana.jpg | alt1 = | image2 = Aphelops restoration.jpg | alt2 = | footer = Left: A living Antilocapra, or pronghorn. Right: Life restoration of the Miocene-Pleistocene hornless rhinoceros Aphelops. Jay Matternes (1964).}} Antilocapra – or unidentified comparable form - †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
- {{multiple image
| total_width = 330 | image1 = Cormocyon leptodus.JPG | alt1 = | image2 = Arctocyon DB.jpg | alt2 = | image3 = ArctodusSimusReconstruct.jpg | alt3 = | footer = Left: Fossilized skull of the Oligocene bone-crushing dog Archaeocyon. Middle: Life restoration of the Paleocene mammal Arctocyon. Right: Life restoration of an Arctodus, or short-faced bear, with a human to scale.}} †Archaeocyon - †Archaeohippus
- †Archaeolagus
- †Archisyrphus – type locality for genus
- †Archisyrphus opacus – type locality for species
- †Arctocyon
- †Arctodus
- †Arctostaphylos
- †Ardynomys
- †Ardynomys occidentalis – type locality for species
- †Arretotherium
- †Arretotherium acridens – type locality for species
- Arundo
- Arvicola
- †aspera
- †Astronium
- †Athyana
- †Atoposemys
- †Aulolithomys
- †Aulolithomys bounites – type locality for species
- †Averrhoites
- †Avunculus
- †Avunculus didelphodonti – type locality for species
- †Axestemys
- Azolla
- †Azolla elegans – type locality for species
- †Azolla fragilis – type locality for species
- †Azolla velus
B{{Compact ToC}}- †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
- Berchemia
- †Beringiaphyllum
- †Beringiaphyllum cupanioides
- †Bessoecetor
- †Bessoecetor septentrionalis
- Betula
- †Betula fairii
- †Betula stevensoni
- †Betula thor
- †Betula vera
- Bibio – or unidentified related form
- Bison
- †Bison bison
- {{multiple image
| total_width = 330 | image1 = Bison latifrons fossil buffalo (Pleistocene; North America) 1 (15257877377).jpg | alt1 = | image2 = Blastomeryx advena.jpg | alt2 = | image3 = Brachychampsa NT small.jpg | alt3 = | footer = Left: Mounted fossilized skeleton of the Pleistocene Bison latifrons, also known as the giant bison or long-horned bison. Middle: Life restoration of the Miocene musk deer Blastomeryx. Robert Bruce Horsfall (1913). Right: Life restoration of the Late Cretaceous Alligator relative Brachychampsa.}} †Bison latifrons – or unidentified comparable form - †Bisonalveus
- †Blastomeryx
- †Bootherium
- †Borealosuchus
- †Borealosuchus sternbergii
- †Brachychampsa
- †Brachycrus
- †Brachyerix
- †Brachyrhynchocyon
- †Brachyrhynchocyon dodgei
- †Brachyrhynchocyon montanus – type locality for species
- †Browniea
C{{Compact ToC}}- †Caesalpinites
- †Caesalpinites acuminatus
- †Caesalpinites coloradicus
- †Calycites
- {{multiple image
| total_width = 248 | image1 = Camelus hesternus Sergiodlarosa.jpg | alt1 = | image2 = European grey wolf in Prague zoo.jpg | alt2 = | footer = Left: Life restoration of the Pliocene-Holocene camel Camelops. Right: A living Canis lupus, or gray wolf.}} †Camelops - †Camponotites
- †Canavalia
- Canis
- †Canis latrans
- †Canis lupus
- †Canna
- †Carcinodon
- †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
- †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
- †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
- 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
- Cercis
- †Cercis parvifolia
- †Cercis spokanensis
- †Cercocarpus
- †Cercocarpus antiquus
- †Cercocarpus beaannae
- †Cercocarpus myricaefolius
- †Chadrolagus
- †Chaetoptelea
- †Chaetoptelea microphylla
- †Chamaecyparis
- †Chamaecyparis linguaefolia
- †Chamops
- †Chamops segnis – or unidentified comparable form
- {{multiple image
| total_width = 248 | image1 = Champsosaurus BW.jpg | alt1 = | image2 = Chisternon.jpg | alt2 = | footer = Left: Life restoration of the Late Cretaceous-Eocene choristoderan reptile Champsosaurus. Right: Fossilized skeleton of the Eocene turtle Chisternon.}} †Champsosaurus - †Chiromyoides
- †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
- {{multiple image
| total_width = 330 | image1 = Cimexomys minor.jpg | alt1 = | image2 = Starr 010419 0038 cinnamomum camphora.jpg | alt2 = | image3 = Clematis 'Nelly Moser'.JPG | alt3 = | footer = Left: Fossilized tooth of the Late Cretaceous-Paleocene multituberculate mammal Cimexomys. Middle: A living Cinnamomum, or cinnamon tree. Right: Flower of a living Clematis.}} †Cimexomys - †Cimexomys minor – type locality for species
- †Cimolestes
- Cinnamomum
- Cissus
- †Claenodon
- Clematis
- †Clematis ellensburgensis
- Cocculus
- †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
- †Coniferites
- †Coniferites conicus – type locality for species
- †Coniferites ovatus – type locality for species
- †Coniferites strobiliformis – type locality for species
- †Coniophis – or unidentified comparable form
- †Contogenys
- †Contogenys ekalakaensis – type locality for species
- †Contogenys sloani
- †Conzattia
- †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
- {{multiple image
| total_width = 330 | image1 = Coryphodon.jpg | alt1 = | image2 = Cosoryx furcatus pronghorn.jpg | alt2 = | image3 = Credneria triacuminata.jpg | alt3 = | footer = Left: Life restoration of the Paleocene-Eocene pantodont mammal Coryphodon. Heinrich Harder (1920). Middle: Mounted fossilized skeleton of the Miocene pronghorn-relative Cosoryx. Right: Fossilized leaf from a Credneria tree.}} †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 – tentative report
- Crataegus
- †Crataegus elwyni
- †Crataegus pacifica
- †Credneria
- 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
- †Cylindrodon – type locality for genus
- †Cylindrodon fontis – type locality for species
- †Cynodesmus
- †Cynodesmus thooides – type locality for species
- Cynomys
D{{Compact ToC}}- †Dalbergia
- †Daphoenictis – or unidentified comparable form
- †Davidia
- †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
- {{multiple image
| total_width = 330 | image1 = Subhyracodon tridactylus.jpg | alt1 = | image2 = ExtmDinictis1921-029-11.jpg | alt2 = | image3 = Dinohippus leidyanus 3.JPG | alt3 = | footer = Left: Life restoration of the Oligocene-Miocene hornless rhinoceros Diceratherium. Robert Bruce Horsfall (1913). Middle: Life restoration of the Eocene-Miocene false saber-toothed cat Dinictis. Robert Bruce Horsfall (1913). Right: Mounted fossilized skeleton of the Miocene-Pliocene horse Dinohippus.}} †Diceratherium - †Diceratherium annectens
- †Diceratherium armatum
- †Diceratherium radtkei – type locality for species
- †Didymictis
- †Dillerlemur
- †Dillerlemur pagei – type locality for species
- †Dinictis
- †Dinohippus
- †Dioctria – tentative report
- †Dioctria jamesi – type locality for species
- †Diospyros
- †Diphysa
- †Diplodipelta – type locality for genus
- Dipteronia
- †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
- †Douglassciurus
- †Douglassciurus jeffersoni – type locality for species
- †Downsimus
- †Dromomeryx
- †Dryinoides – type locality for genus
- †Dryinoides oxyrhachis – type locality for species
- Dryopteris
- †Dryopteris lakesi
- †Dryopteris serrata
E{{Compact ToC}}- †Ectocion
- †Ectocion cedrus
- †Ectocion collinus
- †Ectoganus
- †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
- †Elomeryx – tentative report
- †Elphidotarsius
- †Elphidotarsius florencae – type locality for species
- †Elphidotarsius russelli
- †Elpidophorus
- †Elpidophorus elegans
- †Elpidophorus minor – type locality for species
- †Entoptychus
- †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
- {{multiple image
| total_width = 330 | image1 = Eotitanops borealis.jpg | alt1 = | image2 = Epicyon haydeni skeleton.jpg | alt2 = | image3 = Epihippus sp.jpg | alt3 = | footer = Left: Life restoration of the Eocene brontothere mammal Eotitanops. Middle: Mounted fossilized skeleton of the Miocene bone-crushing dog Epicyon. Right: Underside of the fossilized cranium of the Eocene horse Epihippus.}} †Eotitanops - †Epicyon
- †Epihippus
- †Epihippus gracilis – or unidentified comparable form
- †Epoicotherium
- †Equisetum
- †Equisetum aquatile – type locality for species
- †Equisetum arcticum
- †Equisetum octangulatum
- Equus
- †Equus conversidens – or unidentified comparable form
- †Equus proversus
- Erucius – tentative report
- †Erucius lewisi – type locality for species
- †Eucastor
- †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
- †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
F{{Compact ToC}}- †Fagopsis
- Ficus
- †Ficus affinis
- †Ficus artocarpoides
- †Ficus planicostata
- †Ficus subtruncata
- Fidiobia
- Fokienia
- Formica
- †Formica annosa – type locality for species
- †Fraxinus
- †Fraxinus brevialata
- †Fraxinus eocenica
- †Fraxinus flexifolia
- †Fraxinus rupinarum
G{{Compact ToC}}- †Galbreathia
- †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
- Gleichenia
- Glyptostrobus
- †Glyptostrobus nordenskioldi
- †Glyptostrobus oregonensis
- †Goniacodon
- †Gregorymys
- †Gregorymys douglassi – type locality for species
- †Gripholagomys – tentative report
H{{Compact ToC}}- †Habrosaurus
- †Hamamelites
- †Haplaletes
- †Haplaletes andakupensis
- †Haplaletes disceptatrix – type locality for species
- †Haplomylus
- †Haplomylus palustris – type locality for species
- †Helaletes
- †Heliscomys
- †Heliscomys gregoryi
- †Heliscomys mcgrewi – or unidentified comparable form
- †Heliscomys ostranderi
- Helius
- †Helius constenius – type locality for species
- {{multiple image
| total_width = 330 | image1 = Helodermoides tuberculatus AMNH 11311.jpg | alt1 = | image2 = Herpetotherium.jpg | alt2 = | image3 = Cynodictis.jpg | alt3 = | footer = Left: Fossilized skull of the Oligocene lizard Helodermoides. Middle: Life restoration of the Eocene-Miocene mammal Herpetotherium. Right: Life restoration of Hesperocyon.}} †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
- Hesperinus – or unidentified related form
- †Hesperocyon
- †Heteraletes
- †Hiodon
- †Hiodon consteniorum – type locality for species
- Holmskioldia
- †Holopogon
- †Holopogon archilestes – type locality for species
- Homo
- {{multiple image
| total_width = 330 | image1 = Homotherium serum.jpg | alt1 = | image2 = Hyaenodon NT small.jpg | alt2 = | image3 = Hyopsodus.jpg | alt3 = | footer = Left: Life restoration of Pliocene-Pleistocene Homotherium, or scimitar cat. Middle: Life restoration of the Eocene-Miocene creodont mammal Hyaenodon. Right: Life restoration of the Eocene odd-toed ungulate Hyopsodus.}} †Homotherium - †Huerfanodon – or unidentified comparable form
- †Hutchemys – type locality for genus
- †Hutchemys rememdium – type locality for species
- †Hyaenodon
- Hydrangea
- †Hydromystria
- †Hyopsodus
- †Hypertragulus
- †Hypertragulus calcaratus
- †Hypisodus
- †Hypohippus
- †Hypohippus osborni – or unidentified comparable form
- †Hypolagus
- †Hypsiops
- †Hypsiops breviceps – type locality for species
- †Hyrachyus
- †Hyrachyus douglassi – type locality for species
- †Hyracodon
- †Hyracodon medius
- †Hyracodon priscidens
I{{Compact ToC}}- †Ictidopappus
- †Ictidopappus mustelinus – type locality for species
- †Ignacius
- †Intyrictis
- †Ischyrhiza – or unidentified comparable form
- †Ischyromys
- †Ischyromys douglassi – type locality for species
- †Ischyromys typus
- †Ischyromys veterior – type locality for species
- Isoetes
- †Isoetes trullata – type locality for species
- †Isoetites
- Isonychia
- †Isonychia alderensis – type locality for species
J{{Compact ToC}}- †Jepsenella – type locality for genus
- †Jepsenella praepropera – type locality for species
- †Judithemys
- †Juglandicarya
- †Juglandiphyllites
- †Juglandiphyllites glabra
- Juglans
- †Juglans regia – or unidentified comparable form
- †Juglans taurina
- Juniperus
K{{Compact ToC}}- †Kerria
- †Kimbetohia
- Koelreuteria
- †Koelreuteria arnoldi
- †Koelreuteria bipinnatoides
- †Ktunaxia – type locality for genus
- †Ktunaxia jucunda – type locality for species
- †Kukusepasutanka
- †Kukusepasutanka schultzi
L{{Compact ToC}}- †Labidolemur – type locality for genus
- †Labidolemur kayi – type locality for species
- Lasius
- †Lasius glom – type locality for species
- †Lastrea
- †Latiblattella
- †Latiblattella avita – type locality for species
- †Laurophyllum
- Laurus
- †Leguminosites
- †Leidymys
- †Leipsanolestes
- †Leipsanolestes siegfriedti
- Lemmiscus
- 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
- {{multiple image
| total_width = 330 | image1 = Leptauchenia by Apokryltaros cropped.png | alt1 = | image2 = Leptictis cf. acutidens.jpg | alt2 = | image3 = Leptocyon gregorii holotype AMNH 12879.jpg | alt3 = | footer = Left: Life restoration of the Oligocene-Miocene oreodont mammal Leptauchenia. Middle: Fossilized skeleton of the Eocene-Oligocene Leptictis. Right: Illustration of a fossilized skull of the Oligocene-Miocene dog Leptocyon.}} †Leptauchenia - †Leptauchenia decora
- †Leptauchenia major
- †Leptictis
- †Leptochoerus
- †Leptocyon
- †Leptocyon douglassi – type locality for species
- †Leptodontomys
- †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
- †Leucaena
- †Lignimus
- †Limnenetes
- †Limnenetes platyceps – type locality for species
- †Limnoecus
- Lindera
- †Lisserpeton
- †Litaletes
- †Litaletes disjunctus – type locality for species
- †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
M{{Compact ToC}}- †Machaerosaurus
- †Machaerosaurus torrejonensis
- Magnolia
- †Magnolia borealis
- †Magnolia magnifolia
- Mahonia
- †Mahonia hakeaeformis
- †Mahonia limirivuli
- †Mahonia lobodonta
- †Mahonia obliqua
- †Mahonia retculata
- †Mahonia reticulata
- †Mahonia simplex
- †Mahonia subdenticulata
- †Mammut
| total_width = 330 | image1 = Mammut americanum Sergiodlarosa.jpg | alt1 = | image2 = Columbian mammoth.jpg | alt2 = | image3 = Ice age fauna of northern Spain - Mauricio Antón.jpg | alt3 = | footer = Left: Life restoration of a Mammut americanum, or American mastodon. Middle: Life restoration of a herd of Mammuthus columbi, or Columbian mammoths. The extent of the fur depicted is hypothetical. Charles R. Knight (1909). Right: Restoration of a herd of Mammuthus primigenius, or wooly mammoths.}} †Mammut americanum - †Mammuthus
- †Mammuthus columbi
- †Mammuthus primigenius
- Marchantia
- †Marchantia lignitica
- †Marchantia pealei
- Marmota
- †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
- {{multiple image
| total_width = 330 | image1 = Titanotherium.jpg | alt1 = | image2 = Megahippus mckennai.jpg | alt2 = | image3 = Megalonyx wheatleyi - AMNH - DSC06327.JPG | alt3 = | footer = Left: Life restoration of battling males of the Eocene brontothere mammal Megacerops. Middle: Fossilized skull and limb bones of the Miocene horse Megahippus. Right: Mounted fossilized skeleton of the Miocene-Pleistocene ground sloth Megalonyx.}} †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
- {{multiple image
| total_width = 330 | image1 = Megantereon model.jpg | alt1 = | image2 = Megatylopus.jpg | alt2 = | image3 = Merriamoceros coronatus life restoration.jpg | alt3 = | footer = Left: Restorative model of the Pliocene-Pleistocene saber-toothed cat Megantereon. Middle: Life restoration of the Miocene camel Megatylopus. Right: Life restoration of the Miocene pronghorn Merriamoceros with an anachronistic human to scale.}} †Megantereon - †Megatylopus
- †Melastomites
- †Melastomites montanensis
- †Meniscomys
- †Menodus
- †Merriamoceros
- †Merychippus
- †Merychyus
- †Merychyus arenarum – or unidentified comparable form
- †Merychyus smithi
- {{multiple image
| total_width = 248 | image1 = Merycochoerus proprius.jpg | alt1 = | image2 = Oreodon.jpg | alt2 = | footer = Left: Restorative portrait of the Oligocene-Miocene oreodont mammal Merycochoerus. Right: Life restoration of the Eocene-Oligocene oreodont mammal Merycoidodon. Heinrich Harder (1920).}} †Merycochoerus - †Merycodus
- †Merycodus necatus – or unidentified comparable form
- †Merycoides
- †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
- {{multiple image
| total_width = 248 | image1 = Mesohippus.jpg | alt1 = | image2 = Mesoreodonskull.jpg | alt2 = | footer = Left: Life restoration of the Eocene-Oligocene horse Mesohippus. Heinrich Harder (c. 1920). Right: Fossilized skull of the Miocene oreodont mammal Mesoreodon.}} †Mesohippus - †Mesohippus bairdi
- †Mesohippus westoni – type locality for species
- †Mesoreodon
- †Mesoreodon chelonyx
- †Mesoreodon minor – type locality for species
- †Mesoscalops
- †Mesoscalops montanensis – type locality for species
- †Metadjidaumo
- Metasequoia
- †Metasequoia occidentalis
- †Metopium
- †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
- †Mimotricentes
- †Mimotricentes fremontensis
- †Mimotricentes tedfordi – tentative report
- †Minerisporites
- †Minerisporites glossoferus (Dijkstra) n. comb.
- †Miniochoerus – tentative report
- †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
- †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
- Mustela
- †Mustelavus
- Myrica
- †Myrica lignitum
- †Myrica mormonensis
- †Myrica serrulata
- †Myrmecoboides
- †Myrmecoboides montanensis – type locality for species
- †Myrtophyllum
- †Mystipterus
- †Mytonolagus
- †Mytonolagus petersoni – or unidentified comparable form
N{{Compact ToC}}- †Namatomys
- †Namatomys lloydi – type locality for species
- †Nannodectes
- †Nannodectes gidleyi – or unidentified comparable form
- †Nannodectes intermedius
- †Nannodectes simpsoni – or unidentified comparable form
- †Nanodelphys
- †Nanotragulus
- †Navajovius
- †Nelumbago
- {{multiple image
| total_width = 248 | image1 = Nelumno nucifera open flower - botanic garden adelaide2.jpg | alt1 = | image2 = Neohipparion.jpg | alt2 = | footer = Left: A living Nelumbo lotus. Right: Life restoration of a herd of Neohipparion. Robert Bruce Horsfall (1913).}} †Nelumbo - †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
- †Nuphar
- †Nyctitherium
- †Nymphaeites
- †Nyssa
- †Nyssa alata
- †Nyssa borealis
- †Nyssa crenata
O{{Compact ToC}}- †Ocajila
- †Ocajila makpiyahe – or unidentified comparable form
- †Odaxosaurus
- Odocoileus – or unidentified comparable form
- †Ogmophis
- †Ogmophis arenarum – type locality for species
- Olar
- †Oligodontosaurus
- †Oligodontosaurus wyomingensis – or unidentified comparable form
- †Oligoryctes
- †Oligoryctes altitalonidus
- †Oligoryctes cameronensis
- †Oligoscalops
- †Oligotheriomys
- Ondatra
- †Ondatra xibethicus
- †Ondatra zibethicus
- †Onoclea
- †Onychodectes
- †Opisthotriton
- †Opisthotriton gidleyi – type locality for species
- †Opisthotriton kayi
- Oreohelix
- †Oreolagus
- †Oreonetes
- †Oreonetes anceps
- †Oreonetes douglassi
- †Osmanthus
- †Osmunda
- †Osmunda greenlandica
- †Osmunda macrophylla
- †Osmunda occidentalis
- Ostrya
- †Otarocyon
- †Oxyacodon
- †Oxyacodon apiculatus
- †Oxyacodon ferronensis
- †Oxyacodon marshater
- †Oxyclaenus
- †Oxydactylus
- †Oxydactylus lacota – or unidentified comparable form
- †Oxyprimus
- †Oxyprimus erikseni – type locality for species
P{{Compact ToC}}- †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
- {{multiple image
| total_width = 248 | image1 = Palaeogale skull lateral Matthew 1902.png | alt1 = | image2 = Palaeolagus NT small.jpg | alt2 = | footer = Left: Illustration of a fossilized cranium of the Eocene-Miocene carnivoran mammal Palaeogale. Right: Life restoration of the Oligocene rabbit relative Palaeolagus.}} †Palaeogale - †Palaeohypnum
- †Palaeolabrus
- †Palaeolabrus montanensis – or unidentified comparable form
- †Palaeolagus
- †Palaeolagus burkei
- †Palaeolagus haydeni
- †Palaeolagus hypsodus
- †Palaeolagus intermedius
- †Palaeolagus temnodon – type locality for species
- †Palaeophytocrene
- †Palaeoryctes
- {{multiple image
| total_width = 248 | image1 = Palaeosinopa.jpg | alt1 = | image2 = Palaeosyops leidyi.JPG | alt2 = | footer = Left: Fossilized skeleton of the Eocene mammal Palaeosinopa. Right: Restorative model and fossilized skull of the Eocene brontothere mammal Palaeosyops.}} †Palaeosinopa - †Palaeosinopa didelphoides – or unidentified comparable form
- †Palaeosyops
- †Palaeoxantusia
- †Palatobaena
- †Palenochtha – type locality for genus
- †Palenochtha minor – type locality for species
- †Paleonelumbo
- †Paleonuphar
- †Paleopsephurus – or unidentified comparable form
- †Paleotomus
- †Paleotomus senior – type locality for species
- 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
- †Paramylodon
- †Paramys
- †Paranymphaea
- †Paranymphaea crassifolia
- †Parapliosaccomys
- †Parapliosaccomys annae – or unidentified comparable form
- †Pararyctes
- †Paratomarctus
- †Paratomarctus temerarius
- †Parectypodus
- †Parectypodus sinclairi – type locality for species
- †Parectypodus sylviae
- †Pareumys – tentative report
- †Parictis
- †Paromomys
- †Paromomys depressidens – type locality for species
- †Paromomys maturus – type locality for species
- †Parthenocissus
- †Parvericius
- †Paulownia
- †Paulownia columbiana
- †Paulownia thomsoni
- †Peltosaurus
- †Pelycomys
- †Penetrigonias
- †Penetrigonias dakotensis
- †Penosphyllum
- 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
- †Petauristodon
- †Phasmatopelecinus – type locality for genus
- †Phasmatopelecinus leonae – type locality for species
- †Phenacodaptes – or unidentified comparable form
- †Phenacodus
- †Phenacodus bisonensis
- †Phenacodus intermedius
- †Phenacodus magnus
- Phragmites
- †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
- †Pinus florissanti
- †Pinus wheeleri
- †Pipestoneia – type locality for genus
- †Pipestoneia douglassi – type locality for species
- †Pipestoneomys
- †Pipestoneomys bisulcatus
- †Pithecolobium
- †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
- †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
- {{multiple image
| total_width = 330 | image1 = Pliohippus Pernix.jpg | alt1 = | image2 = Plithocyon armagnacensis.JPG | alt2 = | image3 = Poebrotherium.jpg | alt3 = | footer = Left: Fossilized skull of the Miocene horse Pliohippus. Middle: Fossilized partial skull of the Miocene dog-like bear relative Plithocyon. Right: Life restoration of the Eocene-Oligocene camel Poebrotherium.}} †Pliohippus - †Plionictis
- †Plithocyon
- †Poacites
- †Poebrotherium
- †Poebrotherium eximium – or unidentified comparable form
- †Poebrotherium wilsoni
- †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
- †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
- †Prodiacodon
- †Prodiacodon concordiarcensis – type locality for species
- †Prodiacodon crustulum – type locality for species
- †Prodiacodon furor – type locality for species
- {{multiple image
| total_width = 248 | image1 = Proiridomyrmex rotundatus specimen.png | alt1 = | image2 = Promerycochoerus superbus.jpg | alt2 = | footer = Left: Fossil of the Eocene ant Proiridomyrmex. Right: Life restoration of the Miocene oreodont mammal Promerycochoerus.}} †Proiridomyrmex - †Proiridomyrmex rotundatus – type locality for species
- †Prokalotermes
- †Prokalotermes alderensis – type locality for species
- †Promerycochoerus
- †Promerycochoerus superbus
- †Promioclaenus
- †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
- †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
- {{multiple image
| total_width = 248 | image1 = Protohippus simus.jpg | alt1 = | image2 = Protungulatum donnae.JPG | alt2 = | footer = Left: Fossilized skeleton of the Miocene horse Protohippus. Right: Fossilized mandible of the Late Cretaceous-Paleocene mammal Protungulatum.}} †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
- †Pseudhipparion
- †Pseudocylindrodon
- †Pseudocylindrodon medius – type locality for species
- †Pseudocylindrodon neglectus – type locality for species
- †Pseudolarix
- †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
- †Psittacotherium multifragum
- Ptelea
- †Ptenidium
- †Ptenidium kishenehnicum – type locality for species
- Pteris
- Pterocarya
- {{multiple image
| total_width = 248 | image1 = Ptilodus skull BW.jpg | alt1 = | image2 = Purgatorius BW.jpg | alt2 = | footer = Left: Illustration of a fossilized skull of the Paleocene multituberculate mammal Ptilodus. Right: Life restoration of the Late Cretaceous-Paleocene primate relative Purgatorius.}} †Ptilodus - †Ptilodus kummae
- †Ptilodus montanus – type locality for species
- †Ptilodus tsosiensis
- †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{{Compact ToC}}- 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{{Compact ToC}}- †Rana – or unidentified comparable form
- Rangifer
- †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
S{{Compact ToC}}- Sabal
- †Sabal grayana
- †Sabal imperialis
- †Sabal powelli
- †Saccoloma
- 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
- †Sapindus
- Sassafras
- †Sassafras ashleyi
- †Sassafras columbiana
- {{multiple image
| total_width = 248 | image1 = Sassafras hesperia 01.jpg | alt1 = | image2 = Merychippus sumani.jpg | alt2 = | footer = Left: Fossilized leaf of the Eocene sassafras Sassafras hesperia. Right: Fossilized jaw and teeth of the Miocene horse Scaphohippus.}} †Sassafras hesperia - †Scalopoides
- †Scapherpeton
- †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
| total_width = 248 | image1 = Sequoia affinis SR 95-07-06 01.jpg | alt1 = | image2 = Simoedosaurus lemoinei Cernay.JPG | alt2 = | footer = Left: Fossilized branch fragment from a Sequoia affinis. Right: Fossilized bones of the Paleocene-Eocene choristoderan reptile Simoedosaurus.}} †Sequoia affinis - †Sespemys – tentative report
- †Simoedosaurus
- †Simpson
- †Simpsonictis
- †Smilax
- †Solenopsites
- †Solenopsites abdita – type locality for species
- †Sophora
- †Sorbus
- †Sparganium
- Spea
- Spermophilus
- †Spermophilus jerae – type locality for species
- †Spermophilus primitivus
- †Spermophilus richardsonii
- †Spiraea
- †Spiraea clavidens
- †Spiraea decurrens
- †Stelocyon
- †Stelocyon arctylos – type locality for species
- {{multiple image
| total_width = 248 | image1 = Steneofiber esseri.JPG | alt1 = | image2 = Stenomylus.jpg | alt2 = | footer = Left: Fossilized partial skulls of the rodent Oligocene-Miocene Steneofiber. Right: Life restoration of the Oligocene-Miocene camel Stenomylus.}} †Steneofiber - †Steneofiber gradatus – or unidentified comparable form
- †Steneofiber hesperus
- †Stenoechinus
- †Stenoechinus tantalus – type locality for species
- †Stenomylus
- †Stenomylus hitchcocki – or unidentified comparable form
- Sterculia
- †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
- {{multiple image
| total_width = 248 | image1 = Dromomeryx.jpg | alt1 = | image2 = Knight Caenopus.jpg | alt2 = | footer = Left: Life restoration of the Miocene deer relative Subdromomeryx. Robert Bruce Horsfall (1913). . Right: Life restoration of the Eocene-Oligocene cow-sized rhinoceros Subhyracodon. Charles R. Knight (1890s).}} †Subdromomeryx - †Subdromomeryx antilopinus
- †Subhyracodon
- †Subhyracodon mitis
- †Subhyracodon occidentalis
- †Submerycochoerus
- †Submerycochoerus bannackensis – type locality for species
- Sylvicola – or unidentified related form
- Sylvilagus
- †Symplocarpus
- †Symplocarpus prefoetidus
T{{Compact ToC}} | total_width = 248 | image1 = Taeniolabis taoensis.jpg | alt1 = | image2 = Tapocyon robustus.jpg | alt2 = | footer = Left: Life restoration of the Paleocene multituberculate mammal Taeniolabis. Right: Life restoration of the Eocene carnivoran relative Tapocyon.}} †Taeniolabis - †Taeniolabis lamberti – type locality for species
- †Tapocyon
- †Tardontia
- †Tardontia occidentale – or unidentified comparable form
- Taricha
- †Taricha miocenica – type locality for species
- Taxodium
- †Taxodium dubium
- †Taxodium olriki
- †Tectochara
- †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
- †Thrinax
- †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
- Tilia
- †Tilia aspera
- †Tilia inaequalis
- †Tinuviel
- Tipula
- †Tipula carolae – type locality for species
- †Tipula rubiensis – type locality for species
- †Titanoides
- †Trapa
- †Trapa angulata
- †Trapa paulula
- †Tricentes
- †Trigenicus
- †Trigonias
- †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
- †Tylocephalonyx
- Typha
U{{Compact ToC}}- †Ulmeriella
- †Ulmeriella rubiensis – type locality for species
- 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{{Compact ToC}}- †Vaccinium
- †Valenopsalis
- †Valenopsalis joyneri – type locality for species
- †Vauquelinia
- †Vauquelinia coloradensis
- †Vauquelinia coloradica
- †Viburnum
- †Viburnum antiquorum
- †Viburnum kraeuseli
- †Viguiera
- Vitis
- †Vitis lobata
- †Vitis muscadinioides
- †Vitis olriki
- †Vitis washingtonensis
- †Viverravus – tentative report
W{{Compact ToC}}- †Wilsoneumys
- †Woodwardia
- †Wortmania – or unidentified comparable form
X{{Compact ToC}}Z{{Compact ToC}}- Zelkova
- †Zelkova drymeja
- †Zelkova hesperia
- †Zelkova krymeja
- †Zelkova nervosa
- †Zelkova oregoniana
- †Zelkova planeroides
- †Zelkova ungeri
- †Zeunerella – tentative report
- †Zeunerella lewisi – type locality for species
References- {{cite web |title=Fossilworks: Gateway to the Paleobiology Database |author=Various Contributors to the Paleobiology Database |url=http://fossilworks.org/ |accessdate=7 August 2017}}
{{Era nav|title=Lists of the prehistoric life of Montana|prefix=List of the |suffix= life of Montana}}{{Lists of the Cenozoic life of the United States}}{{portalbar|Paleontology|Cenozoic|Montana}} 6 : Geology of Montana|Lists of prehistoric life in the United States|Natural history of Montana|Paleontology in Montana|Cenozoic Montana|Cenozoic life of North America |