List of the Cenozoic life of Wyoming

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

A
  • †Aaptoryctes
    • †Aaptoryctes ivyi
  • †Absarokius
    • †Absarokius abbotti
    • †Absarokius gazini – type locality for species
    • †Absarokius metoecus – type locality for species
  • †Abuta – or unidentified related form
    • †Abuta GR507 informal
  • †Acacia
    • †Acacia lamarensis
    • †Acacia macrosperma
    • †Acacia wardii
  • †Acarictis
    • †Acarictis ryani – type locality for species
  • Accipiter
    • A living Accipiter gentilis, or northern goshawk
      †Accipiter gentilis
    • †Accipiter striatus
  • Acer
    • †Acer GR557 informal
    • †Acer GR558 informal
    • †Acer lesquereuxi
    • †Acer newberryi
    • †Acer silberlingii
    • †Acer vivarium
  • †Aceroryctes – type locality for genus
    • †Aceroryctes dulcis – type locality for species
  • †Achaenodon
    • †Achaenodon insolens – type locality for species
    • †Achaenodon robustus – type locality for species
  • †Acidomomys – type locality for genus
    • †Acidomomys hebeticus – type locality for species
  • †Acmeodon
    • †Acmeodon secans
  • †Acocephalus
    • †Acocephalus adae – type locality for species
  • †Acritoparamys
    • †Acritoparamys atavus
    • †Acritoparamys atwateri
    • †Acritoparamys francesi
    • †Acritoparamys wyomingensis
  • Living Acrostichum, or leather ferns
    †Acrostichum
    • †Acrostichum hesperium
  • †Adilophontes – type locality for genus
    • †Adilophontes brachykolos – type locality for species
  • †Adjidaumo
    • †Adjidaumo burkei – tentative report
    • †Adjidaumo craigi – or unidentified comparable form
    • †Adjidaumo minimus
  • †Adocus
  • †Adunator
    • †Adunator fredericki
    • †Adunator ladae
    • †Adunator martinezi
  • Aegialia
    • †Aegialia rupta – type locality for species
  • Aegolius
    • †Aegolius acadicus
    • †Aegolius funereus
  • Life restoration of the Miocene camel Aepycamelus, or the long-necked camel. Heinrich Harder (1920).
    †Aepycamelus
  • †Aerugoamnis – type locality for genus
    • †Aerugoamnis paulus – type locality for species
  • †Aesculus
    • †Aesculus antiquorum
    • †Aesculus hickeyi
  • †Afairiguana – type locality for genus
    • †Afairiguana avius – type locality for species
  • †Ageina
    • †Ageina tobieni
  • †Ageitodendron
    • †Ageitodendron matthewi
  • Agelaius
    • †Agelaius phoeniceus
  • †Agnotocastor
  • Life restoration of the Eocene-Oligocene even-toed ungulate Agriochoerus
    †Agriochoerus
    • †Agriochoerus maximus
    • †Agriochoerus minimus – or unidentified comparable form
  • †Ailanthus
    • †Ailanthus lesquereuxi
  • †Alagomys
    • †Alagomys russelli – type locality for species
  • †Alastor
    • †Alastor solidescens – type locality for species
  • †Albertanella – or unidentified comparable form
    • †Albertanella minuta
  • Alces
    • †Alces alces
  • †Alchornea – or unidentified related form
    • †Alchornea GR546 informal
  • †Aletodon
    • †Aletodon conardae – type locality for species
    • †Aletodon gunnelli – type locality for species
    • †Aletodon quadravus
  • Restorative model of the Miocene deer relative Aletomeryx
    †Aletomeryx
    • †Aletomeryx gracilis
  • †Aletornis – type locality for genus
    • †Aletornis bellus – type locality for species
    • †Aletornis gracilis – type locality for species
    • †Aletornis nobilis – type locality for species
    • †Aletornis pernix – type locality for species
    • †Aletornis venustus – type locality for species
  • Aleurites
    • †Aleurites glandulosa
  • †Alismaphyllites
    • †Alismaphyllites grandifolius
  • †Allantodiopsis
    • †Allantodiopsis erosa
    • †Allantodiopsis RR35 informal
  • †Allantoidiopsis
    • †Allantoidiopsis erosa
  • Fossilized skeleton of the Late Cretaceous-Oligocene Alligator relative Allognathosuchus
    †Allognathosuchus
    • †Allognathosuchus heterodon
    • †Allognathosuchus polyodon
    • †Allognathosuchus wartheni – type locality for species
  • †Allomys
    • †Allomys cristabrevis
  • †Allophylus
    • †Allophylus flexifolia
  • Alnus
    • †Alnus GR548 informal
    • †Alnus RR14 informal
    • †Alnus RR90 informal
  • †Alphagaulus
    • †Alphagaulus vetus
  • †Alticonus
    • †Alticonus gazini
  • †Alveojunctus
    • †Alveojunctus minutus
  • †Alveugena
    • †Alveugena carbonensis – type locality for species
  • †Amaramnis
    • †Amaramnis gregoryi – type locality for species
  • †Ambloctonus
    • †Ambloctonus major
    • †Ambloctonus priscus – or unidentified comparable form
    • †Ambloctonus sinosus
  • †Ameiseophis
    • †Ameiseophis robinsoni – type locality for species
  • †Amelotabes – type locality for genus
    • †Amelotabes simpsoni – type locality for species
  • Fossilized needles of an Amentotaxus, or catkin-yew
    †Amentotaxus
    • †Amentotaxus campbelli
  • Amia
    • †Amia fragosa
  • †Amitabha – type locality for genus
    • †Amitabha urbsinterdictensis – type locality for species
  • †Ampelopsis
    • †Ampelopsis acerifolia
  • †Amphechinus
    • †Amphechinus ellicottae – type locality for species
  • †Amphigyion
    • †Amphigyion straitae
  • †Amphilemur
  • †Amphiplaga
  • Amphiuma
    • †Amphiuma jepseni – type locality for species
  • †Ampliconus
    • †Ampliconus antoni – type locality for species
  • Assemblage of fossilized skeletons of the softshell turtle Amyda
    Amyda
    • †Amyda egregia – type locality for species
    • †Amyda exquisita – type locality for species
    • †Amyda mira – type locality for species
  • †Amynodon
    • †Amynodon advenus
  • †Anacardites
    • †Anacardites schinoloxus
  • Anaclinia – tentative report
  • †Anacodon
    • †Anacodon nexus – type locality for species
    • †Anacodon ursidens
  • †Anamirta – or unidentified comparable form
    • †Anamirta milleri
  • †Anaptomorphus
    • †Anaptomorphus aemulus – type locality for species
    • †Anaptomorphus westi – type locality for species
  • Anas
    • †Anas acuta
    • A living Spatula clypeata, or northern shoveler
      †Anas clypeata
    • †Anas crecca
    • †Anas platyrhynchos
    • †Anas schneideri – type locality for species
  • †Anatella
    • †Anatella tacita – type locality for species
  • †Anconodon
    • †Anconodon cochranensis
    • †Anconodon gidleyi
  • †Anemia
    • †Anemia elongata
  • †Anemorhysis
    • †Anemorhysis natronensis – type locality for species
    • †Anemorhysis pattersoni – type locality for species
    • †Anemorhysis sublettensis – type locality for species
    • †Anemorhysis wortmani – type locality for species
  • †Anilioides
    • †Anilioides nebraskensis
  • †Anisonchus
    • †Anisonchus sectorius
    • †Anisonchus willeyi – type locality for species
  • †Ankylodon
    • †Ankylodon annectens – or unidentified comparable form
  • †Anniealexandria – type locality for genus
    • †Anniealexandria gansi – type locality for species
  • †Anobium
    • †Anobium deceptum – type locality for species
    • †Anobium lignitum – type locality for species
    • †Anobium ovale – type locality for species
  • †Anolbanolis – type locality for genus
    • †Anolbanolis banalis – type locality for species
    • †Anolbanolis geminus – type locality for species
  • †Anomoemys
    • †Anomoemys lewisi
  • Fossilized shell of the Eocene-Oligocene turtle Anosteira
    †Anosteira
    • †Anosteira ornata
    • †Anosteira radulina – type locality for species
    • †Anosteira trionychoides
  • †Antherophagus
    • †Antherophagus priscus – type locality for species
  • Anthonomus
    • †Anthonomus revictus – type locality for species
    • †Anthonomus soporus – type locality for species
  • †Antiacodon
    • †Antiacodon pygmaeus – type locality for species
    • †Antiacodon vanvaleni – type locality for species
    • †Antiacodon venustus – type locality for species
  • A living Antilocapra, or pronghorn
    Antilocapra
    • †Antilocapra americana
  • Apalone
    • †Apalone extensa – type locality for species
    • †Apalone heteroglypta – type locality for species
    • †Apalone postera – type locality for species
  • †Apatemys
    • †Apatemys bellulus – type locality for species
    • †Apatemys bellus
    • †Apatemys chardini – or unidentified comparable form
    • †Apatemys hendryi – type locality for species
    • †Apatemys rodens
  • †Aphaena
    • †Aphaena rotundipennis – type locality for species
  • †Apheliscus – type locality for genus
    • †Apheliscus chydaeus – type locality for species
    • †Apheliscus insidiosus
    • †Apheliscus nitidus
    • †Apheliscus wapitiensis – type locality for species
  • †Aphelops
    • †Aphelops megalodus
  • †Aphronorus
    • †Aphronorus fraudator
    • †Aphronorus orieli – type locality for species
    • †Aphronorus ratatoski – type locality for species
  • †Apodosauriscus – type locality for genus
    • †Apodosauriscus minutus – type locality for species
    • †Apodosauriscus thermophilus – type locality for species
  • †Apriculus
    • †Apriculus praeteritus – type locality for species
  • †Apternodus
    • †Apternodus brevirostris – type locality for species
    • †Apternodus dasophylakas – type locality for species
    • †Apternodus gregoryi – type locality for species
    • †Apternodus iliffensis
    • †Apternodus major – type locality for species
  • Aquila
    • †Aquila antiqua – type locality for species
    • A living Aquila chrysaetos, or golden eagle
      †Aquila chrysaetos
  • Aralia
    • †Aralia notata
    • †Aralia serrulata
    • †Aralia wrightii
  • †Araliophyllum
    • †Araliophyllum quina
  • Araneus
  • †Arapahovius
    • †Arapahovius advena – type locality for species
    • †Arapahovius gazini – type locality for species
  • †Araucaria
    • †Araucaria longifolia
  • †Archaeocyon
    • †Archaeocyon falkenbachi
    • †Archaeocyon leptodus
  • †Archaeolagus
    • †Archaeolagus emeraldensis
  • Life restoration of the Eocene-Oligocene entelodont mammal Archaeotherium
    †Archaeotherium
    • †Archaeotherium minimus
    • †Archaeotherium mortoni
    • †Archaeotherium palustris – type locality for species
  • †Archaerhineura – type locality for genus
    • †Archaerhineura mephitis – type locality for species
  • Arcoa[1]
    • †Arcoa lindgreni – type locality for species[1]
  • †Arctocyon
    • †Arctocyon ferox
    • †Arctocyon mumak
  • †Arctodontomys
    • †Arctodontomys nuptus
    • †Arctodontomys simplicidens
    • †Arctodontomys wilsoni – type locality for species
  • Restoration of an Arctodus, or short-faced bear, with a human to scale
    †Arctodus
    • †Arctodus simus
  • †Arctostaphylos
    • †Arctostaphylos elliptica
  • †Arctostylops
    • †Arctostylops steini
  • †Arecipites
    • †Arecipites tenuiexinous
  • †Arenahippus
    • †Arenahippus aemulor – type locality for species
    • †Arenahippus pernix – type locality for species
  • †Arfia
    • †Arfia junnei
    • †Arfia opisthotoma
    • †Arfia shoshoniensis
    • †Arfia zele – type locality for species
  • Flower of a living Aristolochia, or birthwort
    †Aristolochia
    • †Aristolochia mortua
  • †Armintodelphys
    • †Armintodelphys blacki
    • †Armintodelphys dawsoni
  • †Armintomys
    • †Armintomys tullbergi
  • †Arpadosaurus – type locality for genus
    • †Arpadosaurus gazinorum – type locality for species
    • †Arpadosaurus sepulchralis – type locality for species
  • †Artimonius
    • †Artimonius nocerai
    • †Artimonius witteri
  • Fruit and foliage of a living Artocarpus, the genus including bread and jackfruit
    †Artocarpus – tentative report
    • †Artocarpus quercoides
  • †Asarkina
    • †Asarkina quadrata – type locality for species
  • †Asiabradypus – or unidentified comparable form
  • Asio
    • †Asio flammeus
    • †Asio otus
  • †Asplenium
    • †Asplenium delicatula
    • †Asplenium eoligniticum
    • †Asplenium eolignitum
    • †Asplenium erosum
    • †Asplenium iddingsi
    • †Asplenium remotidens
  • †Astephus
  • †Asterotrygon
  • Astronium
    • †Astronium truncatum
  • †Athyana
    • †Athyana balli
  • †Aulolithomys
    • †Aulolithomys bounites
    • †Aulolithomys vexilliames – type locality for species
  • †Auroralestes
    • †Auroralestes simpsoni
  • †Auxontodon
  • †Averrhoites
    • †Averrhoites affinis
  • †Avunculus
    • †Avunculus didelphodonti – or unidentified comparable form
  • †Axestemys – type locality for genus
    • †Axestemys byssina – type locality for species
    • †Axestemys cerevisia – type locality for species
    • †Axestemys salebrosa – type locality for species
    • †Axestemys uintaensis – type locality for species
  • †Aycrossia
    • †Aycrossia lovei
  • Aythya
    • †Aythya collaris
  • Living Azolla water ferns
    Azolla
    • †Azolla cretacea
  • †Azygonyx
    • †Azygonyx – type locality for species informal
    • †Azygonyx ancylion – type locality for species
    • †Azygonyx grangeri
    • †Azygonyx xenicus – type locality for species

B
  • †Babibasiliscus – type locality for genus
    • †Babibasiliscus alxi – type locality for species
  • †Baena
    • †Baena arenosa – type locality for species
  • †Bahndwivici – type locality for genus
    • †Bahndwivici ammoskius – type locality for species
  • †Baioconodon
    • †Baioconodon denverensis – or unidentified comparable form
    • †Baioconodon middletoni – type locality for species
    • †Baioconodon nordicus
    • †Baioconodon wovokae
  • †Baiotomeus
    • †Baiotomeus douglassi
    • †Baiotomeus lamberti
  • †Baltemys – type locality for genus
    • †Baltemys staurogastros – type locality for species
  • †Baptemys
    • †Baptemys wyomingensis – type locality for species
  • †Barbouromeryx – or unidentified comparable form
  • Life restoration of the Paleocene-Eocene pantodont mammal Barylambda
    †Barylambda
    • †Barylambda churchilli – type locality for species
    • †Barylambda faberi
  • †Bathornis
    • †Bathornis fricki – type locality for species
  • †Bathygenys
    • †Bathygenys alpha
    • †Bathygenys hedlundae
  • †Bathyopsis
    • †Bathyopsis fissidens
  • Restorative model of the Eocene shrew-like mammal Batodonoides
    †Batodonoides
  • †Batrachosauroides – tentative report
  • Bauhinia
    • †Bauhinia wyomingana
    • †Bauhinia wyomingiana
  • †Beilschmiedia
    • †Beilschmiedia eocenica
  • †Berchemiopsis
    • †Berchemiopsis paucidentata
  • †Beringiaphyllum
    • †Beringiaphyllum cupanioides
  • †Berosus
    • †Berosus sexstriatus – type locality for species
    • †Berosus tenuis – type locality for species
  • †Bessoecetor
    • †Bessoecetor septentrionalis
  • Betula
    • †Betula iddingsi
    • †Betula stevensoni
    • †Betula stevensonii
  • Biomphalaria
  • Bison
    • A living Bison bison
      †Bison bison
  • †Bisonalveus – type locality for genus
    • †Bisonalveus browni – type locality for species
    • †Bisonalveus holtzmani – type locality for species
  • †Blechnum
    • †Blechnum anceps
  • Bledius
    • †Bledius adamus – type locality for species
    • †Bledius faecorum – type locality for species
  • †Blickomylus
    • †Blickomylus galushai
  • Fossilized skeleton of the eocene-?Miocene boa snake Boavus
    †Boavus – type locality for genus
    • †Boavus brevis – type locality for species
    • †Boavus idelmani – type locality for species
    • †Boavus occidentalis – type locality for species
  • Boletina
    • †Boletina paludivaga – type locality for species
    • †Boletina umbratica – type locality for species
  • †Bootherium
    • †Bootherium bombifrons
  • †Borealosuchus
    • †Borealosuchus formidabilis
    • †Borealosuchus wilsoni – type locality for species
  • †Botauroides – type locality for genus
    • †Botauroides parvus – type locality for species
  • †Bouromeryx
  • †Boverisuchus
    • †Boverisuchus vorax
  • †Bownomomys – type locality for genus[2]
    • †Bownomomys americanus – type locality for species. Formerly known as Teilhardina americana.[2]
    • †Bownomomys crassidens – type locality for species. Formerly known as Teilhardina crassidens.[2]
  • †Boysia – or unidentified comparable form
    • †Boysia phenacodorum
  • †Brachianodon
    • †Brachianodon westorum – type locality for species
  • Restorative portrait of the Miocene oreodont mammal Brachycrus
    †Brachycrus
    • †Brachycrus rusticus
    • †Brachycrus sweetwaterensis
    • †Brachycrus vaughani
  • †Brachyerix
    • †Brachyerix macrotis
  • †Brachyhyops
    • †Brachyhyops viensis
    • †Brachyhyops wyomingensis – type locality for species
  • †Brachyrhynchocyon
    • †Brachyrhynchocyon dodgei
    • †Brachyrhynchocyon intermedius
  • †Brachyuranochampsa – type locality for genus
    • †Brachyuranochampsa eversolei – type locality for species
  • Bracon
    • †Bracon laminarum – type locality for species
  • Branta
    • A living Branta canadensis, or Canada goose
      †Branta canadensis
  • †Bridgeremys
    • †Bridgeremys pusilla – type locality for species
  • †Brontops
  • †Browniea
    • †Browniea serrata
  • †Bryophyte – or unidentified related form
  • Bubo
    • †Bubo virginianus
  • †Bunophorus
    • †Bunophorus etsagicus
    • †Bunophorus grangeri
    • †Bunophorus macropternus
    • †Bunophorus robustus
    • †Bunophorus sinclairi – type locality for species
  • †Bunrsera
    • †Bunrsera inaequalateralis
  • Buteo
    • †Buteo jamaicensis
    • †Buteo lagopus
    • †Buteo regalis – or unidentified comparable form
  • Mounted fossilized skeleton of the Miocene-modern bird of prey Buteogallus
    Buteogallus

C
  • †Caedocyon
    • †Caedocyon tedfordi – type locality for species
  • †Caenolambda – type locality for genus
    • †Caenolambda jepseni – type locality for species
    • †Caenolambda pattersoni – type locality for species
  • Life restoration of the Eocene-Oligocene cow-sized rhinoceros Subhyracodon. Charles R. Knight (1890s).
    †Caenopus
    • †Caenopus yoderensis – type locality for species
  • †Caesalpinia
    • †Caesalpinia flumen-viridensis
    • †Caesalpinia pecorae
  • †Caesalpinites
    • †Caesalpinites falcata – type locality for species
  • †Calamagras
    • †Calamagras angulatus – or unidentified comparable form
    • †Calamagras platyspondyla
    • †Calamagras primus – type locality for species
    • †Calamagras weigeli
  • †Calamospiza
    • †Calamospiza melanocorys
  • †Calandrites
    • †Calandrites cineratius
    • †Calandrites defessus
  • †Calcardea – type locality for genus
    • †Calcardea junnei – type locality for species
  • Calidris
    • A living Calidris melanotos, or pectoral sandpiper
      †Calidris melanotos
  • †Callomyia
    • †Callomyia torporata – type locality for species
  • †Callospilopteron – type locality for genus
    • †Callospilopteron ocellatum – type locality for species
  • †Calycites
    • †Calycites ardtunensis
    • †Calycites hexaphylla
    • †Calycites mikanoides
    • †Calycites polysepala
    • †Calycites RR58 informal
    • †Calycites RR71 informal
  • †Camelops
    • †Camelops hesternus – or unidentified comparable form
  • †Canarium
    • †Canarium californicum
  • †Canavalia
    • †Canavalia diuturna
  • Canis
    • Modern mounted skeleton of Canis lupus, the grey wolf, to scale with a fossilized skeleton of the Pleistocene wolf Canis dirus, or dire wolf
      †Canis dirus
    • †Canis latrans
    • †Canis lupus
  • †Cantius
    • †Cantius abditus – type locality for species
    • †Cantius frugivorus
    • †Cantius mckennai
    • †Cantius nunienus
    • †Cantius ralstoni
    • †Cantius simonsi – type locality for species
    • †Cantius torresi
    • †Cantius trigonodus – type locality for species
  • †Capacikala
    • †Capacikala parvus – type locality for species
  • Capella
    • †Capella gallinago
  • †Carabites
    • †Carabites kincaidi – type locality for species
  • Caracara
    • A living Caracara plancus, or southern crested caracara
      †Caracara plancus
  • †Cardichelyon – type locality for genus
    • †Cardichelyon rogerwoodi – type locality for species
  • †Cardiolophus
    • †Cardiolophus radinskyi – type locality for species
    • †Cardiolophus semihians
  • Cardiospermum
    • A Cardiospermum coloradensis leaf
      †Cardiospermum coloradensis
  • Carduelis
  • †Carpites
    • †Carpites newberryana
    • †Carpites pedunculatus
    • †Carpites verrucosus
  • †Carpodaptes
    • †Carpodaptes hazelae
    • †Carpodaptes hobackensis
    • †Carpodaptes jepseni
    • †Carpodaptes rosei
    • †Carpodaptes stonleyi
  • †Carpolestes
    • †Carpolestes dubius – type locality for species
    • †Carpolestes nigridens
    • Life restoration of the Paleocene primate relative Carpolestes simpsoni
      †Carpolestes simpsoni – type locality for species
  • †Carpolithes
    • †Carpolithes osseus
  • Carya
    • †Carya antiquorum
    • †Carya veripites
    • †Carya viridifluminipites
  • Castanea
    • †Castanea intermedia
    • †Castanea pulchella
  • Castor
    • †Castor peninsulatus
  • †Catopsalis
    • †Catopsalis alexanderi
    • †Catopsalis calgariensis
  • Living Cedrela trees
    Cedrela
    • †Cedrela trainii
  • †Cedrelospermum
    • †Cedrelospermum lineatum
    • †Cedrelospermum nervosum
  • †Cedrobaena – type locality for genus
    • †Cedrobaena putorius
  • †Cedrocherus
    • †Cedrocherus aceratus – type locality for species
    • †Cedrocherus ryani – type locality for species
  • †Cedromus
    • †Cedromus wardi
  • Foliage and fruit of a living Celastrus, or staff vine
    †Celastrus
    • †Celastrus culveri
    • †Celastrus ellipticus
    • †Celastrus inaequalis
    • †Celastrus winchesteri
  • †Celliforma
    • †Celliforma spirifer
  • Celtis
    • †Celtis aspera
    • †Celtis newberryi
    • †Celtis peracuminata
    • †Celtis phenacodorum
  • †Centetodon
    • †Centetodon bacchanalis
    • †Centetodon bembicophagus
    • †Centetodon chadronensis
    • †Centetodon hendryi
    • †Centetodon magnus
    • †Centetodon marginalis
    • †Centetodon neashami – type locality for species
    • †Centetodon patratus
    • †Centetodon pulcher
  • †Centrinus
    • †Centrinus diruptus – type locality for species
  • †Centrocercus
    • †Centrocercus urophasianus
  • †Cephalogale
  • †Ceratophyllum
  • Life restoration of the Paleocene-Eocene crocodilian Ceratosuchus
    †Ceratosuchus
    • †Ceratosuchus burdoshi
  • Cercidiphyllum
    • †Cercidiphyllum arcticum
    • †Cercidiphyllum articum
    • †Cercidiphyllum BB21 informal
    • †Cercidiphyllum BB34-52 informal
    • †Cercidiphyllum genetrix
    • †Cercidiphyllum tiny winged seeds informal
    • †Cercidiphyllum tiny wingedseeds informal
  • A living Cercopis froghopper
    †Cercopis
    • †Cercopis astricta – type locality for species
  • †Cercopites – type locality for genus
    • †Cercopites calliscens – type locality for species
    • †Cercopites umbratilis – type locality for species
  • †Ceutholestes
    • †Ceutholestes dolosus
  • †Chadrolagus
    • †Chadrolagus emryi
  • †Chaetoptelea
    • †Chaetoptelea microphylla
    • †Chaetoptelea pseudofulva – tentative report
  • †Chalicomomys
    • †Chalicomomys willwoodensis – type locality for species
  • Life restoration of the Late Cretaceous-Eocene choristoderan reptile Champsosaurus
    †Champsosaurus
    • †Champsosaurus gigas
  • †Chaneya
    • †Chaneya tenuis
  • Chara
  • Charadrius
    • †Charadrius montanus
    • †Charadrius vociferus
  • Charina
    • †Charina prebottae
  • Cheilosia
    • †Cheilosia ampla – type locality for species
    • †Cheilosia scudderi
  • †Chelomophrynus – type locality for genus
    • †Chelomophrynus bayi – type locality for species
  • †Chilostigma – tentative report
    • †Chilostigma ostracoderma
  • †Chiromyoides
    • †Chiromyoides caesor – type locality for species
    • †Chiromyoides major – type locality for species
    • †Chiromyoides minor – type locality for species
    • †Chiromyoides potior
  • Chironomus
    • †Chironomus septus – type locality for species
  • Fossilized skeleton of the Eocene turtle Chisternon
    †Chisternon
    • †Chisternon hebraicum – type locality for species
    • †Chisternon undatum – type locality for species
  • †Chlororhysis
    • †Chlororhysis incomptus – type locality for species
    • †Chlororhysis knightensis – type locality for species
  • †Choctawius – or unidentified comparable form
  • †Cholula
    • †Cholula triguttata – type locality for species
  • †Choragus
    • †Choragus fictilis – type locality for species
  • †Chordeiles
    • A living Chordeiles minor, or common nighthawk
      †Chordeiles minor
  • †Chriacus
    • †Chriacus badgleyi
    • †Chriacus baldwini
    • †Chriacus gallinae
    • †Chriacus katrinae
    • †Chriacus oconostotae
    • †Chriacus pelvidens
  • †Chumashius
  • †Cicadula
    • †Cicadula saxosa – type locality for species
  • †Cimolestes
  • †Cinnamomophyllum
    • †Cinnamomophyllum RR19 informal
  • A living Cinnamomum, or cinnamon tree
    Cinnamomum
    • †Cinnamomum sezannense
    • †Cinnamomum spectabilis
  • Circus
    • †Circus cyaneus
  • †Cissites
    • †Cissites rocklandensis
  • Cissus
    • †Cissus haguei
    • †Cissus marginata
    • †Cissus marginatus
  • †Cixius – tentative report
    • †Cixius hesperidum – type locality for species
  • Flowers of a living Cladrastis, or yellowwood
    Cladrastis
    • †Cladrastis GR579 informal
    • †Cladrastis GR580 informal
  • †Claenodon
    • †Claenodon montanensis
  • †Cnemidaria
    • †Cnemidaria magna
  • †Coccothraustes
    • †Coccothraustes vespertinus
  • Fruit and foliage of a living Cocculus, or moonseed
    Cocculus
    • †Cocculus flabella
  • †Coelidia
    • †Coelidia wyomingensis – type locality for species
  • Colaptes
    • †Colaptes auratus
  • †Colodon
    • †Colodon woodi
  • †Colpocherus
  • †Colpoclaenus
    • †Colpoclaenus keeferi – type locality for species
    • †Colpoclaenus procyonoides – or unidentified comparable form
  • Colymbus
    • †Colymbus nigricollis
  • †Compsemys
  • †Conacodon
    • †Conacodon cophater – or unidentified comparable form
    • †Conacodon delphae
  • Illustration of fossilized vertebrae of the Late Cretaceous-Eocene snake Coniophis. Othniel Charles Marsh (1892).
    †Coniophis
    • †Coniophis carinatus – type locality for species
    • †Coniophis platycarinatus – type locality for species
  • †Copecion
    • †Copecion brachypternus
    • †Copecion davisi
  • †Copedelphys
    • †Copedelphys stevensoni
  • †Copelemur
    • †Copelemur australotutus – type locality for species
    • †Copelemur praetutus
    • †Copelemur tutus
  • †Copemys
    • †Copemys longidens
  • †Coriphagus
    • †Coriphagus encinensis – or unidentified comparable form
    • †Coriphagus montanus
  • †Corizus – tentative report
    • †Corizus guttatus – type locality for species
  • Fossilized skull of the Oligocene-Miocene bone-crushing dog Cormocyon
    †Cormocyon
    • †Cormocyon haydeni
  • Cornus
    • †Cornus hyperborea
    • †Cornus nebrascensis
    • †Cornus newberryi
    • †Cornus wrightii
  • Corvus
    • †Corvus brachyrhynchos
    • †Corvus corax
  • †Corylites
    • †Corylites FW01 informal
  • †Corylus
    • †Corylus insignis
    • †Corylus macquarryi
  • Corymbites
    • †Corymbites velatus – type locality for species
  • Life restoration of the Paleocene-Eocene pantodont mammal Coryphodon. Heinrich Harder (1920).
    †Coryphodon
    • †Coryphodon armatus
    • †Coryphodon eocaenus
    • †Coryphodon lobatus
    • †Coryphodon proterus
    • †Coryphodon radians
  • †Cranea
    • †Cranea wyomingensis
  • Crataegus
  • †Credneria
    • †Credneria daturaefolia – tentative report
    • †Credneria pachyphylla
  • †Cristadjidaumo
    • †Cristadjidaumo skinneri – type locality for species
  • Crocodylus
    • Fossilized skull of the Eocene crocodilian "Crocodylus" affinis
      †Crocodylus affinis – type locality for species
    • †Crocodylus ziphodon – type locality for species
  • †Cryptocephalus
    • †Cryptocephalus vetustus – type locality for species
  • Cryptorhynchus
    • †Cryptorhynchus annosus – type locality for species
  • Cryptotis
  • Culex
    • †Culex damnatorum – type locality for species
  • †Cupanieidites
    • †Cupanieidites inaequalis
    • †Cupanieidites inaequatis
  • †Cupidinimus
    • †Cupidinimus whitlocki
  • †Cycadopites
    • †Cycadopites follicularis
  • Cyclocarya
  • †Cyclurus
    • †Cyclurus fragosus
  • †Cylindrodon
    • †Cylindrodon natronensis – type locality for species
    • †Cylindrodon solarborus – type locality for species
  • Underside of a fossilized cranium of the Oligocene-Miocene bone-crushing dog Cynarctoides
    †Cynarctoides
    • †Cynarctoides acridens
    • †Cynarctoides harlowi
    • †Cynarctoides luskensis – type locality for species
  • †Cyperacites
    • †Cyperacites angustior
    • †Cyperacites filiferus
    • †Cyperacites giganteus
  • †Cyriacotherium
    • †Cyriacotherium argyreum – type locality for species
    • †Cyriacotherium psamminum – type locality for species
  • †Cyrilavis
    • †Cyrilavis olsoni – type locality for species
  • †Cyrtomenus
    • †Cyrtomenus concinnus – type locality for species

D
  • †Dalbergia
  • †Daphoenictis
  • Life restoration of the Miocene bear-dog Daphoenodon
    †Daphoenodon
    • †Daphoenodon falkenbachi – type locality for species
    • †Daphoenodon niobrarensis
    • †Daphoenodon skinneri – type locality for species
    • †Daphoenodon superbus
  • †Daphoenus
    • †Daphoenus lambei
  • †Dartonius
    • †Dartonius jepseni
  • A living Dasyatis stingray
    Dasyatis
  • †Davidia
    • †Davidia antiqua
  • †Dawsonicyon – type locality for genus
    • †Dawsonicyon isami – type locality for species
  • †Dawsonomys
    • †Dawsonomys woodi
  • †Dawsonophis – type locality for genus
    • †Dawsonophis wyomingensis – type locality for species
  • †Debeya
  • †Decatoma
    • †Decatoma antiqua – type locality for species
  • †Delotrochanter
    • †Delotrochanter major – type locality for species
  • Dendragapus
    • A living Dendragapus obscurus, or dusky grouse
      †Dendragapus obscurus
  • †Dendropanax
    • †Dendropanax latens
  • †Dennstaedia
    • †Dennstaedia americana
  • †Dennstaedtia
    • †Dennstaedtia americana
  • †Dennstaedtiopsis
    • †Dennstaedtiopsis aerenchymata
  • †Desmatippus
    • †Desmatippus tyleri
  • †Desmatochoerus
    • †Desmatochoerus hatcheri
    • †Desmatochoerus megalodon
  • †Desmatoclaenus
    • †Desmatoclaenus mearae
  • †Desmatolagus
    • †Desmatolagus schizopetrus
  • †Desmatotherium
    • †Desmatotherium intermedius
  • †Desmocyon
    • †Desmocyon thomsoni
  • †Devallia – tentative report
    • †Devallia montana
  • †Diacocherus
    • †Diacocherus meizon – type locality for species
    • †Diacocherus minutus
  • Restoration of two of the Eocene even-toed ungulate Diacodexis being hunted by a primitive whale
    †Diacodexis
    • †Diacodexis ilicis
    • †Diacodexis kelleyi
    • †Diacodexis kellyi
    • †Diacodexis metsiacus
    • †Diacodexis minutus
    • †Diacodexis primus
    • †Diacodexis secans
    • †Diacodexis woltonensis – type locality for species
  • †Diacodon
    • †Diacodon celatus
  • †Diaplegma
    • †Diaplegma obdormitum – type locality for species
  • †Diatryma – type locality for genus
    • †Diatryma gigantea – type locality for species
  • Restoration of the Oligocene-Miocene hornless rhinoceros Diceratherium. Robert Bruce Horsfall (1913).
    †Diceratherium
    • †Diceratherium annectens
    • †Diceratherium armatum
    • †Diceratherium tridactylum
  • Dicotylophyllum
    • †Dicotylophyllum anomalum
    • †Dicotylophyllum mercerensis
  • Dicranomyia
    • †Dicranomyia primitiva
    • †Dicranomyia rhodolitha – type locality for species
  • Dicrostonyx
  • †Didelphodontine
  • †Didelphodus
    • †Didelphodus absarokae
    • †Didelphodus altidens
  • †Didymictis
    • †Didymictis altidens
    • †Didymictis leptomylus
    • †Didymictis protenus
    • †Didymictis proteus
    • †Didymictis vancleveae – or unidentified comparable form
  • †Dillerlemur
    • †Dillerlemur pagei
    • †Dillerlemur robinettei – type locality for species
  • †Dilophodon
    • †Dilophodon destitutus – type locality for species
    • †Dilophodon minusculus
  • Life restoration of the Eocene-Miocene false saber-toothed cat Dinictis. Robert Bruce Horsfall (1913).
    †Dinictis
    • †Dinictis felina
  • †Dinohyus
  • †Diospyros
    • †Diospyros brachysepala
    • †Diospyros haguei
    • †Diospyros lamarensis
  • †Dipassalus
    • †Dipassalus oryctes
  • †Diplobunops
    • †Diplobunops matthewi
  • †Diplocynodon
  • †Diplolophus
    • †Diplolophus insolens – type locality for species
  • Fossilized skeleton of the Early Cretaceous-Eocene bony fish Diplomystus preserved in the act of swallowing another fish
    †Diplomystus
    • †Diplomystus dentatus
  • †Dipoides
    • †Dipoides stirtoni
  • †Dipsalidictis
    • †Dipsalidictis aequidens
    • †Dipsalidictis krausei – type locality for species
    • †Dipsalidictis platypus – type locality for species
    • †Dipsalidictis transiens
  • †Dipsalodon
    • †Dipsalodon churchillorum
    • †Dipsalodon matthewi – type locality for species
  • Fossilized samara of the Eocene-modern Dipteronia tree
    Dipteronia
    • †Dipteronia GR551 informal
    • †Dipteronia insignis
  • Discus
  • †Dissacus
    • †Dissacus argenteus – type locality for species
    • †Dissacus longaevus
    • †Dissacus navajovius
    • †Dissacus praenuntius
  • †Distylium
    • †Distylium eocenica
  • †Dithelysia
    • †Dithelysia amorensis
  • A living Dolichopus fly
    Dolichopus
  • †Dombeya
    • †Dombeya novimundi
  • †Domnina
    • †Domnina gradata – or unidentified comparable form
  • †Domninoides
    • †Domninoides valentinensis – or unidentified comparable form
  • †Dorraletes
    • †Dorraletes diminutivus
  • †Douglassciurus
    • †Douglassciurus jeffersoni
  • †Drimys
  • Dryocoetes
    • †Dryocoetes carbonarius – type locality for species
    • †Dryocoetes impressus
  • †Dryomomys – type locality for genus
    • †Dryomomys dulcifer – type locality for species
    • †Dryomomys szalayi – type locality for species
  • Illustration of a modern Dryopteris, or wood fern
    Dryopteris
    • †Dryopteris lakesi
    • †Dryopteris longipetiolatum
    • †Dryopteris meeteetseana
    • †Dryopteris serrata
    • †Dryopteris weedii
    • †Dryopteris xantholithensis
  • †Dunnophis
    • †Dunnophis microechinis – type locality for species
    • †Dunnophis microechinus
  • †Dysagrion – type locality for genus
    • †Dysagrion fredericii – type locality for species
    • †Dysagrion lakesii – type locality for species
    • †Dysagrion packardii – type locality for species

E
  • Fossilized shell of the Eocene turtle Echmatemys
    †Echmatemys
    • †Echmatemys haydeni
    • †Echmatemys lativertebralis
    • †Echmatemys megaulax
    • †Echmatemys rivalis – type locality for species
    • †Echmatemys septaria
    • †Echmatemys testudinea
    • †Echmatemys wyomingensis
  • †Eclytus
    • †Eclytus lutatus – type locality for species
  • Fossilized skull of the Paleocene-Eocene mammal Ectocion
    †Ectocion
    • †Ectocion cedrus – type locality for species
    • †Ectocion collinus – type locality for species
    • †Ectocion major – or unidentified comparable form
    • †Ectocion mediotuber – type locality for species
    • †Ectocion osbornianus
    • †Ectocion parvus
    • †Ectocion superstes
  • †Ectoconus
    • †Ectoconus cavigellii – type locality for species
    • †Ectoconus ditrigonus
  • †Ectoganus
    • †Ectoganus bighornensis
    • †Ectoganus copei
    • †Ectoganus gliriformes
    • †Ectoganus gliriformis
    • †Ectoganus lobdelli
  • †Ectopistes
    • Taxidermied male Ectopistes migratorius, or passenger pigeon
      †Ectopistes migratorius
  • †Ectopocynus
    • †Ectopocynus antiquus – type locality for species
    • †Ectopocynus intermedius – type locality for species
  • †Ectypodus
    • †Ectypodus aphronorus
    • †Ectypodus childei – or unidentified comparable form
    • †Ectypodus hazeni – type locality for species
    • †Ectypodus laytoni – type locality for species
    • †Ectypodus lovei
    • †Ectypodus musculus
    • †Ectypodus powelli – type locality for species
    • †Ectypodus simpsoni
    • †Ectypodus szalayi
    • †Ectypodus tardus
  • †Elaeodendron
    • †Elaeodendron polymorphum
  • †Ellipsodon
    • †Ellipsodon lemuroides – or unidentified comparable form
  • †Elphidotarsius
    • †Elphidotarsius florencae – or unidentified comparable form
    • †Elphidotarsius shotgunensis
  • †Elpidophorus
    • †Elpidophorus elegans
    • †Elpidophorus minor – or unidentified comparable form
  • †Elwynella – type locality for genus
    • †Elwynella oreas – type locality for species
  • †Enhydrocyon
    • †Enhydrocyon basilatus
    • †Enhydrocyon crassidens
    • †Enhydrocyon pahinsintewakpa
  • Enochrus
    • †Enochrus primaevus – type locality for species
  • Life restoration of the Eocene-Oligocene mammal Entelodon. Charles R. Knight.
    †Entelodon
    • †Entelodon coarctatus – or unidentified comparable form
  • †Entomolestes – type locality for genus
    • †Entomolestes grangeri – type locality for species
    • †Entomolestes westgatei – type locality for species
  • †Entomophontes – type locality for genus
    • †Entomophontes hutchisoni – type locality for species
    • †Entomophontes incrustatus – type locality for species
  • †Entoptychus
  • Life restoration of a pair of the Eocene uintathere mammal Eobasileus. Charles R. Knight (1890s).
    †Eobasileus
    • †Eobasileus cornutus
  • †Eobucco
    • †Eobucco brodkorbi
  • †Eocalopteryx
    • †Eocalopteryx atavina – type locality for species
  • †Eoceornis – type locality for genus
    • †Eoceornis ardetta – type locality for species
  • †Eoconodon
    • †Eoconodon copanus
  • †Eocrex – type locality for genus
    • †Eocrex primus – type locality for species
  • †Eodiploglossus – type locality for genus
    • †Eodiploglossus borealis – type locality for species
  • †Eoerianthus
    • †Eoerianthus multispinosa
  • †Eoformica
    • †Eoformica pinguis – type locality for species
  • †Eofringillirostrum – type locality for genus[3]
    • †Eofringillirostrum boudreauxi – type locality for species[4]
  • †Eoglyptosaurus
    • †Eoglyptosaurus donohoei – type locality for species
  • Eohiodon
  • Life restoration of the Eocene horse Eohippus. Heinrich Harder (1920).
    †Eohippus
    • †Eohippus cristatus
  • †Eoictops – type locality for genus
    • †Eoictops novaceki – type locality for species
  • †Eoliarus – tentative report
    • †Eoliarus lutensis – type locality for species
  • †Eomoropus
    • †Eomoropus amarorum
    • †Eomoropus anarsius
  • †Eopodagrion – type locality for genus
    • †Eopodagrion abortivum – type locality for species
    • †Eopodagrion scudderi – type locality for species
  • †Eorhinophrynus
    • †Eorhinophrynus septentrionalis – type locality for species
  • †Eoryctes – type locality for genus
    • †Eoryctes melanus – type locality for species
  • †Eostangeria
    • †Eostangeria pseudopteris
  • †Eostrix
    • †Eostrix martinellii – type locality for species
  • Life restoration of the Eocene brontothere mammal Eotitanops
    †Eotitanops
    • †Eotitanops borealis
  • †Eotylopus
    • †Eotylopus reedi – type locality for species
  • †Eozygodactylus – type locality for genus
    • †Eozygodactylus americanus – type locality for species
  • †Epicaerus
    • †Epicaerus dilapsus – type locality for species
    • †Epicaerus effossus – type locality for species
    • †Epicaerus exanimis – type locality for species
    • †Epicaerus fodinarum
    • †Epicaerus saxatilis – type locality for species
    • †Epicaerus subterraneus
    • †Epicaerus terrosus – type locality for species
  • Underside of the fossilized cranium of the Eocene horse Epihippus
    †Epihippus
    • †Epihippus gracilis
  • †Epitriplopus
    • †Epitriplopus uintensis
  • †Epoicotherium
    • †Epoicotherium unicum
  • †Equisetum
    • †Equisetum canaliculatum
    • †Equisetum deciduum
    • †Equisetum FW21 informal
    • †Equisetum haguei
  • Equus
  • Eremophila
    • †Eremophila alpestris
  • Erythrina speciosa inflorescences, Brazil
    Erythrina
    • †Erythrina roanensis – type locality for species
  • Esox
    • †Esox kronneri – type locality for species
  • †Esthonyx
    • †Esthonyx acutidens
    • †Esthonyx bisulcatus
    • †Esthonyx gunnelli
    • †Esthonyx spatularius
  • †Eucastor
  • †Eucommia
    • †Eucommia serrata
  • †Eudaemonema
    • †Eudaemonema cuspidata
  • Branches and fruits of a living Eugenia
    Eugenia
    • †Eugenia americana
  • †Eugnamptus
    • †Eugnamptus decemsatus – type locality for species
    • †Eugnamptus grandaevus
  • †Euhapsis
    • †Euhapsis ellicottae
  • †Eumys
    • †Eumys elegans
  • †Euparius
    • †Euparius elusus – type locality for species
    • †Euparius repertus – type locality for species
  • Euphagus
    • †Euphagus cyanocephalus
    • †Euphagus magnirostris
  • †Euproteaciphyllum
    • †Euproteaciphyllum minutum
  • Fossilized mandible of the Eocene-Oligocene false saber-toothed cat Eusmilus
    †Eusmilus
    • †Eusmilus sicarius
  • Eutamias
  • †Eutypomys
    • †Eutypomys parvus
  • †Exostinus
    • †Exostinus lancensis – or unidentified comparable form

F
  • Fagus
    • †Fagus antipofii
    • †Fagus undulata
  • Falco
    • †Falco columbarius
    • †Falco falconella – type locality for species
    • A living Falco mexicanus, or prairie falcon
      †Falco mexicanus
    • †Falco rusticolus
    • †Falco sparverius
  • †Ficarasites – type locality for genus
    • †Ficarasites stigmaticum – type locality for species
  • Ficus
    • †Ficus affinis
    • †Ficus artocarpoides
    • †Ficus asiminaefolia
    • †Ficus deformata
    • †Ficus densifolia
    • †Ficus haguei
    • †Ficus planicostata
    • †Ficus shastensis – tentative report
    • †Ficus subtruncata
    • †Ficus tiliaefolia – tentative report
    • †Ficus ungeri
  • †Firmianites – type locality for genus
    • †Firmianites aterrimus – type locality for species
  • †Florentiamys
    • †Florentiamys kinseyi – type locality for species
    • †Florentiamys loomisi – type locality for species
  • Fossilized skeleton of the Eocene bird Fluvioviridavis
    †Fluvioviridavis – type locality for genus
    • †Fluvioviridavis platyrhamphus – type locality for species
  • †Foekenia
    • †Foekenia catenulata
  • †Fortuna
    • †Fortuna marsilioides – or unidentified comparable form
  • †Franimys
    • †Franimys ambos
    • †Franimys amherstensis – type locality for species
    • †Franimys buccatus
  • †Fraxinoipollenis
    • †Fraxinoipollenis variabilis
  • †Fraxinoipollenites
    • †Fraxinoipollenites pachyexinous
    • †Fraxinoipollenites variabilis
  • †Fraxinopollenites
    • †Fraxinopollenites variabilis
  • Illustrations of the flowers and foliage of a living Fraxinus, or ash tree, with insets further detailing its anatomy
    †Fraxinus
    • †Fraxinus eocenica
    • †Fraxinus eocinica
    • †Fraxinus wrightii
  • †Fulgora
    • †Fulgora granulosa – type locality for species
    • †Fulgora populata – type locality for species

G
  • †Gagadon
    • †Gagadon minimonstrum
  • †Galbreathia
    • †Galbreathia novellus
  • †Galecyon
    • †Galecyon mordax
  • Galerita
    • †Galerita marshii – type locality for species
  • Fossilized skeleton of the Eocene bird Gallinuloides
    †Gallinuloides – type locality for genus
    • †Gallinuloides wyomingensis – type locality for species
  • Gastrocopta
  • Gastrodonta
  • †Gaultia – type locality for genus
    • †Gaultia silvaticus – type locality for species
  • †Gazinius
    • †Gazinius amplus
    • †Gazinius bowni – type locality for species
  • †Gazinocyon
    • †Gazinocyon vulpeculus
  • †Gelastops
    • †Gelastops joni – type locality for species
    • †Gelastops parcus
  • †Geranoides – type locality for genus
    • †Geranoides jepseni – type locality for species
  • †Geringophis
    • †Geringophis depressus
  • Gerrhonotus – or unidentified comparable form
  • Ginkgo
  • †Gleditsia – or unidentified related form
    • †Gleditsia RR29 informal
  • †Gleicheniidites
  • †Glypta
    • †Glypta transversalis – type locality for species
  • †Glyptosaurus – type locality for genus
    • †Glyptosaurus agmodon – type locality for species
    • †Glyptosaurus obtusidens – type locality for species
    • †Glyptosaurus rhodinos – type locality for species
    • †Glyptosaurus sphenodon – type locality for species
    • †Glyptosaurus sylvestris – type locality for species
  • Glyptostrobus
  • †Goinophis – tentative report
  • †Gomphochelys – type locality for genus
    • †Gomphochelys nanus – type locality for species
  • †Goniacodon
    • †Goniacodon levisanus – type locality for species
  • †Goniodontomys
    • †Goniodontomys disjunctus
  • Gopherus
    • †Gopherus laticuneus
  • †Gracilocyon
    • †Gracilocyon rosei
    • †Gracilocyon winkleri
  • †Grangerella
  • †Gregorymys
    • †Gregorymys formosus
    • †Gregorymys riggsi – type locality for species
  • †Grewiopsis – tentative report
    • †Grewiopsis aldersoni
  • †Griphomys
  • Grus
    • †Grus canadensis
    • †Grus marshi – type locality for species
  • Gulo
    • A living Gulo gulo, or wolverine
      †Gulo gulo
  • †Gymnetron
    • †Gymnetron lecontei – type locality for species
  • †Gymnocladus
    • †Gymnocladus hesperia
  • Gyraulus – or unidentified comparable form

H
  • †Habrosaurus
    • †Habrosaurus dilatus
  • †Hadrianus
    • †Hadrianus allabiatus – type locality for species
    • †Hadrianus quadratus – type locality for species
  • †Hammapteryx – type locality for genus
    • †Hammapteryx reticulata – type locality for species
  • Restoration of the Paleocene-Eocene mesonychian mammal Hapalodectes
    †Hapalodectes
    • †Hapalodectes anthracinus
    • †Hapalodectes leptognathus
  • †Hapalorestes
    • †Hapalorestes lovei – type locality for species
  • †Haplaletes
    • †Haplaletes disceptatrix
    • †Haplaletes pelicatus – type locality for species
  • †Haploconus
  • †Haplodontosaurus
    • †Haplodontosaurus excedens
  • †Haplolambda
    • †Haplolambda quinni
  • †Haplomylus
    • †Haplomylus bozemanensis – type locality for species
    • †Haplomylus palustris
    • †Haplomylus scottianus – type locality for species
    • †Haplomylus simpsoni
    • †Haplomylus speirianus
    • †Haplomylus zalmouti
  • Fossilized skull of the mesonychian mammal Harpagolestes
    †Harpagolestes
    • †Harpagolestes macrocephalus – type locality for species
  • †Harpalodon
    • †Harpalodon sylvestris – or unidentified comparable form
  • †Harrymys
    • †Harrymys irvini
    • †Harrymys woodi
  • †Helaletes – type locality for genus
    • †Helaletes nanus – type locality for species
  • †Heliscomys
    • †Heliscomys hatcheri
    • †Heliscomys mcgrewi
    • †Heliscomys ostranderi
    • †Heliscomys vetus – or unidentified comparable form
  • †Helix
    • †Helix evanstonensis
    • †Helix sinclairi
  • Fossilized skull of the Oligocene lizard Helodermoides
    †Helodermoides
    • †Helodermoides tuberculatus
  • †Helohyus
    • †Helohyus lentus
    • †Helohyus milleri – type locality for species
    • †Helohyus plicodon – type locality for species
  • †Hemiacodon
    • †Hemiacodon casamissus – type locality for species
    • †Hemiacodon engardae – type locality for species
    • †Hemiacodon gracilis
  • Fossilized lower jaw of the Miocene-Pleistocene llama relative Hemiauchenia
    †Hemiauchenia
  • †Hemipsalodon
    • †Hemipsalodon grandis
  • Hemitelia
    • †Hemitelia magna
  • †Hemithlaeus
    • †Hemithlaeus harbourae
    • †Hemithlaeus josephi
  • †Hendryomeryx
    • †Hendryomeryx wilsoni
  • †Heptacodon
  • †Heptodon
    • †Heptodon calciculus
    • †Heptodon posticus
  • Life restoration of the Eocene-Miocene mammal Herpetotherium
    †Herpetotherium
    • †Herpetotherium innominatum – type locality for species
    • †Herpetotherium knighti
    • †Herpetotherium youngi – or unidentified comparable form
  • †Hesperocyon
    • †Hesperocyon gregarius
  • †Hesperopetes
    • †Hesperopetes thoringtoni – type locality for species
  • †Hesperosorex
    • †Hesperosorex lovei – type locality for species
  • †Heteraletes
    • †Heteraletes leotanus
  • †Hexacodus
    • †Hexacodus pelodes
    • †Hexacodus uintensis
  • †Hicoria
    • †Hicoria antiqua
    • †Hicoria crescentia
    • †Hicoria culveri
  • Hirundo – or unidentified comparable form
    • †Hirundo pyrrhonota
  • †Holospira
  • †Homacodon
    • †Homacodon vagans – type locality for species
  • †Homalota
    • †Homalota recisa – type locality for species
  • †Homogalax
    • †Homogalax protapirinus
  • †Honrovits – type locality for genus
    • †Honrovits tsuwape – type locality for species
  • Life restoration of the Eocene-Oligocene false saber-toothed cat Hoplophoneus. Robert Bruce Horsfall (1913).
    †Hoplophoneus
    • †Hoplophoneus mentalis
    • †Hoplophoneus primaevus
  • †Hovenia
    • †Hovenia oregonensis – or unidentified comparable form
  • †Huerfanodon
    • †Huerfanodon polecatensis – type locality for species
  • †Hummelichelys
    • †Hummelichelys annae – type locality for species
    • †Hummelichelys ellipticus
    • †Hummelichelys grangeri – type locality for species
    • †Hummelichelys guttatus – type locality for species
  • †Hutchemys
    • †Hutchemys rememdium
  • Life restoration of the Eocene-Miocene creodont mammal Hyaenodon
    †Hyaenodon
    • †Hyaenodon crucians
    • †Hyaenodon horridus
    • †Hyaenodon megaloides
    • †Hyaenodon montanus
    • †Hyaenodon mustelinus
    • †Hyaenodon venturae
    • †Hyaenodon vetus
  • Hydrangea
    • †Hydrangea antica
    • †Hydrangea GR537 informal
  • Hydrobia – report made of unidentified related form or using admittedly obsolete nomenclature
  • A living Hydrobius water scavenger beetle
    Hydrobius
    • †Hydrobius confixus – type locality for species
    • †Hydrobius decineratus – type locality for species
  • †Hydrochus
    • †Hydrochus relictus – type locality for species
  • †Hydromystria
    • †Hydromystria expansa
  • †Hylobius
    • †Hylobius packardii – type locality for species
    • †Hylobius provectus – type locality for species
  • Life restoration of the Eocene odd-toed ungulate Hyopsodus
    †Hyopsodus
    • †Hyopsodus aemulor
    • †Hyopsodus latidens
    • †Hyopsodus lepidus – type locality for species
    • †Hyopsodus loomisi
    • †Hyopsodus lysitensis
    • †Hyopsodus mentalis
    • †Hyopsodus minor
    • †Hyopsodus minusculus – type locality for species
    • †Hyopsodus miticulus
    • †Hyopsodus paulus – type locality for species
    • †Hyopsodus pauxillus – type locality for species
    • †Hyopsodus powellianus
    • †Hyopsodus simplex
    • †Hyopsodus tonksi – type locality for species
    • †Hyopsodus uintensis
    • †Hyopsodus walcottianus
    • †Hyopsodus wortmani
  • †Hypertragulus
    • †Hypertragulus calcaratus
  • †Hypisodus
    • †Hypisodus alacer
    • †Hypisodus minimus
  • Life restoration of the Miocene horse Hypohippus. Heinrich Harder (1920).
    †Hypohippus
    • †Hypohippus affinis
  • †Hypolagus
    • †Hypolagus parviplicatus – or unidentified comparable form
  • †Hyporhina
    • †Hyporhina tertia
  • †Hypsiops
    • †Hypsiops breviceps
  • †Hyrachyus
    • †Hyrachyus eximius
    • †Hyrachyus modestus – type locality for species
  • Life restoration of the Eocene-Oligocene odd-toed ungulate Hyracodon. Charles R. Knight (1896).
    †Hyracodon
    • †Hyracodon nebraskensis
    • †Hyracodon petersoni
    • †Hyracodon priscidens
  • †Hyracotherium
    • †Hyracotherium vasacciense

I
  • Fossilized skeleton of the Eocene bat Icaronycteris
    †Icaronycteris – type locality for genus
    • †Icaronycteris index – type locality for species
  • †Ignacius
    • †Ignacius clarkforkensis – type locality for species
    • †Ignacius fremontensis
    • †Ignacius frugivorus
    • †Ignacius graybullianus
  • †Iguanavus – type locality for genus
    • †Iguanavus exilis – type locality for species
  • †Indusia
    • †Indusia calculosa – type locality for species
  • †Insulapollenites
    • †Insulapollenites leboensis
    • †Insulapollenites rugulatus
  • †Intyrictis
    • †Intyrictis vanvaleni
  • †Iridodon – type locality for genus
    • †Iridodon datzae – type locality for species
  • Mounted fossilized skeleton of the Eocene-Oligocene rodent Ischyromys
    †Ischyromys
    • †Ischyromys typus
    • †Ischyromys veterior
  • †Isectolophus
    • †Isectolophus latidens
    • †Isectolophus radinskyi – type locality for species
  • †Isoetites
    • †Isoetites horridus
  • †Iulus
    • †Iulus telluster – type locality for species

J
  • †Jepsenella
    • †Jepsenella praepropera
  • †Jepsibaena
    • †Jepsibaena minor – type locality for species
  • †Joffrea
    • †Joffrea BB20 informal
    • †Joffrea FW50 informal
  • †Judithemys
    • †Judithemys backmani – or unidentified comparable form
  • †Juglandicarya
  • †Juglandiphyllites
    • †Juglandiphyllites glabra
  • Juglans
    • †Juglans crescentia
    • †Juglans laurifolia
    • †Juglans rugosa
    • †Juglans schimperi
  • Fossilized skeleton of the Eocene wading bird Juncitarsus
    †Juncitarsus – type locality for genus
    • †Juncitarsus gracillimus – type locality for species
  • Junco – or unidentified comparable form
    • †Junco hyemalis
  • †Junglandaceae

K
  • †Kalmia
    • †Kalmia elliptica
  • †Kalobatippus
    • †Kalobatippus agatensis
    • †Kalobatippus avus
  • Fossilized skeleton of the Eocene bony fish Knightia
    †Knightia
    • †Knightia eocaena
  • †Knightomys
    • †Knightomys cremneus
    • †Knightomys cuspidatus
    • †Knightomys depressus
    • †Knightomys huerfanensis
    • †Knightomys minor
    • †Knightomys senior
  • Koelreuteria
    • †Koelreuteria viridifluminis
  • †Koniaryctes
    • †Koniaryctes paulus – type locality for species
  • †Kydia – or unidentified related form
    • †Kydia FW61 informal

L
  • †Labidolemur
    • †Labidolemur kayi
    • †Labidolemur major – type locality for species
    • †Labidolemur serus
    • †Labidolemur soricoides
  • Laccobius
    • †Laccobius elongatus – type locality for species
  • †Laevigatosporites
  • A living Lagopus, or ptarmigan
    †Lagopus
    • †Lagopus leucurus – or unidentified comparable form
  • †Lambdotherium
    • †Lambdotherium popoagicum
  • †Lambertocyon
    • †Lambertocyon eximius
    • †Lambertocyon gingerichi – type locality for species
  • Lanius
    • †Lanius ludovicianus
  • Larus – or unidentified comparable form
  • †Lastrea
    • †Lastrea goldiana
  • Lathrobium
    • †Lathrobium abscessum – type locality for species
  • †Laurinoxylon
    • †Laurinoxylon pulchellum
  • †Laurophyllum
    • †Laurophyllum caudatum
    • †Laurophyllum perseanum
  • Living Laurus, or laurel trees
    Laurus
    • †Laurus californica
    • †Laurus grandis
    • †Laurus montana
    • †Laurus perdita
    • †Laurus primigenia – tentative report
    • †Laurus princeps
    • †Laurus socialis
  • †Leguminosites
    • †Leguminosites coloradensis
    • †Leguminosites lamarensis
    • †Leguminosites lesquereuxiana
    • †Leguminosites regularis – type locality for species
  • Leiocephalus
  • †Leipsanolestes
    • †Leipsanolestes siegfriedti
  • Illustration of a living Lepisosteus, or gar
    Lepisosteus
    • †Lepisosteus glaber – or unidentified comparable form
    • †Lepisosteus occidentalis
  • †Leptacodon
    • †Leptacodon donkroni
    • †Leptacodon munusculum
    • †Leptacodon packi – type locality for species
    • †Leptacodon tener
  • †Leptarctus – or unidentified comparable form
  • Restoration of the Oligocene-Miocene oreodont mammal Leptauchenia
    †Leptauchenia
    • †Leptauchenia decora
    • †Leptauchenia major
  • †Leptictis
    • †Leptictis dakotensis
  • †Leptocyon
    • †Leptocyon gregorii
  • †Leptolambda
    • †Leptolambda schmidti
  • Life restoration of the Eocene-Oligocene even-toed ungulate Leptomeryx
    †Leptomeryx
    • †Leptomeryx esulcatus
    • †Leptomeryx evansi
    • †Leptomeryx mammifer
    • †Leptomeryx semicinctus
    • †Leptomeryx speciosus
    • †Leptomeryx yoderi – type locality for species
  • †Leptoreodon
  • †Leptotomus
    • †Leptotomus guildayi
    • †Leptotomus parvus – type locality for species
  • †Leptotragulus
    • †Leptotragulus clarki – or unidentified comparable form
    • †Leptotragulus medius
    • †Leptotragulus ultimus
  • Lepus
  • Lepyrus – tentative report
    • †Lepyrus evictus – type locality for species
  • †Lestophis
    • †Lestophis anceps – type locality for species
    • †Lestophis crassus – type locality for species
  • †Leucosticte
    • †Leucosticte arctoa
  • †Limaconyssus – type locality for genus
    • †Limaconyssus habrus – type locality for species
  • †Limalophus
    • †Limalophus compositus
    • †Limalophus contractus – type locality for species
  • Top view of a fossilized skull of the Eocene creodont mammal Limnocyon
    †Limnocyon
    • †Limnocyon cuspidens – type locality for species
    • †Limnocyon medius
    • †Limnocyon potens – type locality for species
    • †Limnocyon velox – type locality for species
    • †Limnocyon verus – type locality for species
  • †Limnoecus
  • Fossilized skeleton of the Eocene freshwater frigatebird Limnofregata
    †Limnofregata – type locality for genus
    • †Limnofregata azygosternon – type locality for species
    • †Limnofregata hutchisoni – type locality for species
  • Lindera
    • †Lindera obtusata
    • †Lindera varifolia – type locality for species
  • †Lisserpeton
    • †Lisserpeton bairdi
  • †Listronotus
    • †Listronotus muratus – type locality for species
  • †Litaletes
    • †Litaletes disjunctus
    • †Litaletes ondolinde
  • †Lithexorista – type locality for genus
    • †Lithexorista scudderi – type locality for species
  • †Lithohypoderma
    • A Lithohypoderma ascarides larva
      †Lithohypoderma ascarides - type locality for species
  • †Lithophis – type locality for genus
    • †Lithophis sargenti – type locality for species
  • †Lithophysa – type locality for genus
    • †Lithophysa tumulta – type locality for species
  • †Lithopsis – type locality for genus
    • †Lithopsis elongata – type locality for species
    • †Lithopsis fimbriata – type locality for species
  • Life restoration of the Paleocene-Eocene bird Lithornis
    †Lithornis
    • †Lithornis plebius – type locality for species
    • †Lithornis promiscuus – type locality for species
  • †Lithotorus – type locality for genus
    • †Lithotorus cressoni – type locality for species
  • †Litocherus
    • †Litocherus lacunatus – type locality for species
    • †Litocherus notissimus
    • †Litocherus zygeus – type locality for species
  • †Litolagus
    • †Litolagus molidens
  • †Litolestes
    • †Litolestes ignotus – type locality for species
  • †Litomylus
    • †Litomylus dissentaneus – type locality for species
    • †Litomylus ishami – type locality for species
    • †Litomylus scaphicus – type locality for species
  • †Litoyoderimys
    • †Litoyoderimys auogoleus
  • †Lophiotherium
    • †Lophiotherium vasacciensis – type locality for species
  • †Lophiparamys
    • †Lophiparamys debequensis
    • †Lophiparamys murinus
    • †Lophiparamys woodi
  • †Lophocion[5]
    • †Lophocion grangeri – type locality for species[5]
  • †Loveina – type locality for genus
    • †Loveina minuta
    • †Loveina sheai
    • †Loveina wapitiensis
    • †Loveina zephyri – type locality for species
  • †Loxolophus
    • †Loxolophus criswelli
    • †Loxolophus faulkneri – type locality for species
    • †Loxolophus hyattianus – or unidentified comparable form
    • †Loxolophus priscus
  • †Lucashyus – type locality for genus
    • †Lucashyus coombsae – type locality for species
  • †Lyctocoris – tentative report
    • †Lyctocoris terreus – type locality for species
  • Lygodium
    • †Lygodium coloradense
    • †Lygodium kaulfussi
  • Lynx
    • A living Lynx lynx, or Eurasian lynx
      †Lynx lynx – tentative report
  • †Lystra – tentative report
    • †Lystra leei – type locality for species
    • †Lystra richardsoni – type locality for species

M
  • †Maceopolipollenites
    • †Maceopolipollenites amplus
    • †Maceopolipollenites leboensis
    • †Maceopolipollenites rotundus
    • †Maceopolipollenites tenuipolus
    • †Maceopolipollenites triorbicularis
  • †Macginitiea
    • †Macginitiea gracilis
    • †Macginitiea wyomingensis
  • Restorative portrait of the Eocene saber-toothed creodont mammal Machaeroides
    †Machaeroides
    • †Machaeroides eothen
    • †Machaeroides simpsoni – type locality for species
  • †Machaerosaurus
    • †Machaerosaurus torrejonensis
  • Macrocranion
    • †Macrocranion junnei – type locality for species
    • †Macrocranion nitens
    • †Macrocranion robinsoni
  • †Macrotarsius
    • †Macrotarsius siegerti – type locality for species
  • Close-up view of a Magnolia flower
    Magnolia
    • †Magnolia borealis
    • †Magnolia californica
    • †Magnolia culveri
    • †Magnolia magnifica
    • †Magnolia magnifolia
    • †Magnolia microphylla
    • †Magnolia pollardi
    • †Magnolia spectabilis
  • †Maiorana
    • †Maiorana ferrisensis – type locality for species
    • †Maiorana noctiluca
  • †Malapoenna
    • †Malapoenna cuneata
    • †Malapoenna lamarensis
  • †Malaquiferus
    • †Malaquiferus tourteloti – type locality for species
  • †Malfelis – type locality for genus
    • †Malfelis badwaterensis – type locality for species
  • †Mammacyon
    • †Mammacyon ferocior – type locality for species
  • †Mammuthus
    • Life restoration of a herd of Mammuthus columbi, or Columbian mammoths. The extent of the fur depicted is hypothetical. Charles R. Knight (1909).
      †Mammuthus columbi
  • Marmota
  • †Marsholestes
    • †Marsholestes dasypelix – type locality for species
  • †Mattimys
    • †Mattimys kalicola
  • †Megacerops
    • †Megacerops osborni – type locality for species
  • †Megadelphus
    • †Megadelphus lundeliusi
  • †Megalagus
    • †Megalagus brachyodon
    • †Megalagus primitivus
    • †Megalagus turgidus
  • †Megalesthonyx
    • †Megalesthonyx hopsoni
  • Restorative portrait, reconstructed skull, and actual fossil of the Miocene weasel relative Megalictis
    †Megalictis
    • †Megalictis ferox
    • †Megalictis petersoni
  • †Melanosaurus – type locality for genus
    • †Melanosaurus maximus – type locality for species
  • †Melastomites
    • †Melastomites montanensis
  • †Meliakrouniomys
    • †Meliakrouniomys skinneri
  • †Meliosma
    • †Meliosma flexuosa
    • †Meliosma longifolia
  • Life restoration of the Eocene mammal Meniscotherium. Robert Bruce Horsfall (1913).
    †Meniscotherium
    • †Meniscotherium chamense
    • †Meniscotherium priscum
    • †Meniscotherium tapiacetum
    • †Meniscotherium tapiacitum
  • †Menisperimites
    • †Menisperimites parvareolatus
  • †Menispermites
    • †Menispermites limacioides – type locality for species
    • †Menispermites parvareolatus
  • Life restoration of the Miocene rhinoceros Menoceras
    †Menoceras
    • †Menoceras arikarense
    • †Menoceras barbouri
  • †Menops
    • †Menops heloceras
    • †Menops marshi – or unidentified comparable form
  • †Mentoclaenodon
    • †Mentoclaenodon acrogenius – type locality for species
  • Mergus
    • †Mergus merganser
  • Life restoration of the Miocene three-toed horse Merychippus
    †Merychippus
    • †Merychippus coloradense
    • †Merychippus insignis – or unidentified comparable form
    • †Merychippus primus
  • †Merychyus
    • †Merychyus arenarum
    • †Merychyus crabilli
    • †Merychyus elegans – or unidentified comparable form
    • †Merychyus minimus
  • †Merycobunodon – tentative report
    • †Merycobunodon walshi – type locality for species
  • †Merycochoerus
    • †Merycochoerus chelydra
    • †Merycochoerus magnus
    • †Merycochoerus matthewi
  • Mounted fossilized skeleton of the Miocene pronghorn Merycodus
    †Merycodus
    • †Merycodus sabulonis – or unidentified comparable form
    • †Merycodus warreni – or unidentified comparable form
  • †Merycoides
    • †Merycoides longiceps
    • †Merycoides pariogonus
  • †Merycoidodon
    • †Merycoidodon culbertsoni – type locality for species
    • †Merycoidodon major
    • †Merycoidodon presidioensis – or unidentified comparable form
  • †Mesatirhinus
    • †Mesatirhinus megarhinus
  • †Mesocyon – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Mesocyon temnodon
  • †Mesodma
    • †Mesodma ambigua – type locality for species
    • †Mesodma formosa
    • †Mesodma garfieldensis – or unidentified comparable form
    • †Mesodma hensleighi
    • †Mesodma pygmaea
  • Life restoration of the Eocene-Oligocene horse Mesohippus. Heinrich Harder (c. 1920).
    †Mesohippus
    • †Mesohippus bairdi
    • †Mesohippus westoni – or unidentified comparable form
  • †Mesomeryx – or unidentified comparable form
    • †Mesomeryx grangeri
  • †Mesonyx
    • †Mesonyx obtusidens – type locality for species
  • †Mesoreodon
    • †Mesoreodon chelonyx
    • †Mesoreodon minor – type locality for species
  • †Mesoscalops
    • †Mesoscalops scopelotemos
  • Life restoration of the Eocene pangolin relative Metacheiromys
    †Metacheiromys
    • †Metacheiromys dasypus – type locality for species
    • †Metacheiromys marshi – type locality for species
  • †Metadjidaumo
    • †Metadjidaumo hendryi – type locality for species
  • †Metamynodon
    • †Metamynodon planifrons – or unidentified comparable form
  • †Metanoiamys
    • †Metanoiamys paradoxus
  • †Metarhinus
  • Metasequoia
  • †Metatomarctus
    • †Metatomarctus canavus
  • Life restoration of the Paleocene-Eocene mammal Miacis
    †Miacis
    • †Miacis deutschi
    • †Miacis exiguus
    • †Miacis latidens
    • †Miacis medius
    • †Miacis parvivorus – type locality for species
    • †Miacis petilus
    • †Miacis vorax
  • †Michenia
  • Micrasema – tentative report
    • †Micrasema tessellatum – type locality for species
  • †Microclaenodon
    • †Microclaenodon assurgens
  • †Microcosmodon
    • †Microcosmodon conus – type locality for species
    • †Microcosmodon rosei – type locality for species
  • †Micromomys
    • †Micromomys antelucanus
    • †Micromomys silvercouleei – type locality for species
  • †Microparamys
    • †Microparamys cheradius
    • †Microparamys dubius
    • †Microparamys hunterae
    • †Microparamys minutus
  • Illustration of the shell in multiple views of a llving Microphysula land snail
    Microphysula – or unidentified comparable form
  • †Micropternodus
    • †Micropternodus borealis
  • †Microsus
    • †Microsus cuspidatus – type locality for species
  • †Microsyops
    • †Microsyops angustidens – type locality for species
    • †Microsyops annectens
    • †Microsyops cardiorestes
    • †Microsyops elegans – type locality for species
    • †Microsyops knightensis
    • †Microsyops latidens
    • †Microsyops scottianus
  • Microtus
    • A living Microtus pennsylvanicus, or meadow vole
      †Microtus pennsylvanicus
  • Mictomys
    • †Mictomys vetus
  • †Mimatuta
    • †Mimatuta makpialutae
    • †Mimatuta minuial – type locality for species
  • †Mimetodon
    • †Mimetodon churchilli – type locality for species
    • †Mimetodon silberlingi
  • †Mimoperadectes
    • †Mimoperadectes houdei – type locality for species
    • †Mimoperadectes labrus – type locality for species
  • †Mimosites
    • †Mimosites coloradensis
  • †Mimotricentes
    • †Mimotricentes fremontensis – type locality for species
  • Life restoration of the Eocene-Oligocene oreodont mammal Miniochoerus
    †Miniochoerus
    • †Miniochoerus affinis – type locality for species
    • †Miniochoerus chadronensis – type locality for species
    • †Miniochoerus forsythae
    • †Miniochoerus gracilis
  • †Minippus
    • †Minippus index
  • †Mioclaenus
    • †Mioclaenus opisthacus – or unidentified comparable form
    • †Mioclaenus turgidus
  • †Miocyon
    • †Miocyon major – or unidentified comparable form
  • †Mioheteromys
    • †Mioheteromys amplissimus
  • †Miohippus
    • †Miohippus obliquidens
  • †Miolabis
    • †Miolabis fissidens
  • †Miomustela
  • Fossilized skeleton of the Eocene perch relative Mioplosus
    †Mioplosus
  • †Miospermophilus
    • †Miospermophilus wyomingensis
  • †Miotapirus
    • †Miotapirus harrisonensis – type locality for species
  • †Miotylopus
    • †Miotylopus gibbi
    • †Miotylopus leonardi
    • †Miotylopus taylori – type locality for species
  • Restoration of the Pliocene-Pleistocene Miracinonyx, or American cheetah
    †Miracinonyx
    • †Miracinonyx studeri
  • †Mithrandir
    • †Mithrandir gillianus
  • †Mitostylus
    • †Mitostylus seculorum – type locality for species
  • †Mixodectes
    • †Mixodectes malaris
  • Mnemosyne
    • †Mnemosyne terrentula – type locality for species
  • †Mojavemys
    • †Mojavemys magnumarcus
  • †Monosaulax
    • †Monosaulax curtus – or unidentified comparable form
  • Life restoration of the Miocene chalicothere mammal Moropus threatening a pair of the bear-dog Daphoenodon. Jay Matternes (1964).
    †Moropus
    • †Moropus hollandi
  • Morus
    • †Morus montanensis
  • †Musophyllum
    • †Musophyllum complicatum
  • Mustela
    • †Mustela americana
    • †Mustela nigripes
  • Mycetobia – tentative report
    • †Mycetobia terricola – type locality for species
  • †Mylanodon – type locality for genus
    • †Mylanodon rosei – type locality for species
  • Fruit of a living Myrica, or firetree
    Myrica
    • †Myrica lamarensis
    • †Myrica scottii
    • †Myrica wardii
  • †Myrmecoboides
    • †Myrmecoboides montanensis
  • Myrmica
  • †Myrtophyllum
    • †Myrtophyllum torreyi
  • †Mysops
    • †Mysops fraternus
    • †Mysops minimus – type locality for species
    • †Mysops parvus – type locality for species
  • †Mytonolagus
    • †Mytonolagus petersoni
    • †Mytonolagus wyomingensis – type locality for species
  • †Mytonomys
    • †Mytonomys coloradensis
    • †Mytonomys wortmani

N
  • †Namatomys
    • †Namatomys erythrus – type locality for species
    • †Namatomys lloydi
  • †Nannodectes
    • †Nannodectes gazini – type locality for species
    • †Nannodectes gidleyi
    • †Nannodectes intermedius – type locality for species
    • †Nannodectes simpsoni – type locality for species
  • †Nanodelphys
    • †Nanodelphys hunti
  • †Nanomomys
    • †Nanomomys thermophilus
  • †Nanotragulus
    • †Nanotragulus loomisi – type locality for species
    • †Nanotragulus ordinatus
  • †Naocephalus – type locality for genus
    • †Naocephalus porrectus – type locality for species
  • †Navajovius
    • †Navajovius kohlhaasae
  • †Neanis
    • †Neanis schucherti
  • †Necrocydnus
    • †Necrocydnus gosiutensis – type locality for species
  • †Necygonus – type locality for genus
    • †Necygonus rotundatus – type locality for species
  • †Nelumbago
    • †Nelumbago montanum
  • A living Nelumbo lotus
    †Nelumbo
  • †Neocathartes
    • †Neocathartes grallator
  • †Neodiacodexis
    • †Neodiacodexis emryi
  • †Neoliotomus
    • †Neoliotomus conventus
    • †Neoliotomus ultimus
  • Mounted fossilized skeleton of the Miocene Neophrontops
    Neophrontops
    • †Neophrontops americana
    • †Neophrontops americanus
  • †Neoplagiaulax
    • †Neoplagiaulax grangeri – tentative report
    • †Neoplagiaulax hunteri
    • †Neoplagiaulax jepi – type locality for species
    • †Neoplagiaulax mckennai – type locality for species
    • †Neoplagiaulax nelsoni
  • †Neothanes
    • †Neothanes testeus – type locality for species
  • Neotoma
  • †Neovulpavus
    • †Neovulpavus washakius
  • †Nexuotapirus
    • †Nexuotapirus marslandensis
  • †Niglarodon
  • †Niptomomys
    • †Niptomomys doreenae
    • †Niptomomys favorum – type locality for species
    • †Niptomomys thelmae
  • †Nonomys
    • †Nonomys simplicidens
  • †Nordenskioldia
    • †Nordenskioldia borealis
  • †Nosodendron
    • †Nosodendron tritavum – type locality for species
  • †Notharctus
    • †Notharctus robinsoni – type locality for species
    • †Notharctus robustior
    • Mounted fossilized skeleton of the Eocene primate Notharctus tenebrosus
      †Notharctus tenebrosus – type locality for species
    • †Notharctus venticolus
  • †Notogoneus
  • †Notomorpha – type locality for genus
    • †Notomorpha garmanii – type locality for species
    • †Notomorpha gravis – type locality for species
    • †Notomorpha testudinea – type locality for species
  • †Notoparamys – tentative report
    • †Notoparamys blochi – type locality for species
  • †Nototamias – or unidentified comparable form
  • †Nucifraga
    • †Nucifraga columbiana
  • Numenius
    • †Numenius americanus
    • A taxidermied Numenius borealis, or Eskimo curlew
      †Numenius borealis
  • †Nyctea
    • †Nyctea scandiaca
  • †Nyctitherium
    • †Nyctitherium christopheri
    • †Nyctitherium gunnelli – type locality for species
    • †Nyctitherium serotinum – type locality for species
    • †Nyctitherium velox
  • †Nyssa
    • †Nyssa alata
    • †Nyssa borealis

O
  • Ochotona
    • A living Ochotona princeps, or American pika
      †Ochotona princeps
  • Ocotea
    • †Ocotea coloradensis
    • †Ocotea FW03 informal
  • †Odaxosaurus
    • †Odaxosaurus jepseni – or unidentified comparable form
    • †Odaxosaurus piger
  • †Ogmophis
    • †Ogmophis microcompactus – or unidentified comparable form
    • †Ogmophis voorhiesi
  • †Oligodontosaurus – type locality for genus
    • †Oligodontosaurus wyomingensis – type locality for species
  • †Oligoryctes
    • †Oligoryctes altitalonidus
    • †Oligoryctes cameronensis
  • †Oligoscalops – tentative report
  • †Oligospermophilus
  • †Oligotheriomys
    • †Oligotheriomys senrudi
  • †Oliveremys
    • †Oliveremys uintaensis – type locality for species
  • †Omalodiscus
  • †Omomys
    • †Omomys carteri
    • †Omomys lloydi
  • Ondatra
    • †Ondatra meadensis
  • †Onoclea
    • †Onoclea hesperia
  • Restoration of the Eocene bat Onychonycteris
    †Onychonycteris – type locality for genus
    • †Onychonycteris finneyi – type locality for species
  • †Oodectes
    • †Oodectes herpestoides – type locality for species
    • †Oodectes jepseni
  • Ophryastes
    • †Ophryastes compactus – type locality for species
  • †Opisthotriton
    • †Opisthotriton kayi
  • A living Oreamnos, or mountain goat
    Oreamnos
  • †Oreoconus
  • †Oreodontoides
    • †Oreodontoides oregonensis
  • Oreohelix
    • †Oreohelix megarche
  • †Oreolagus
    • †Oreolagus colteri
    • †Oreolagus nebrascensis
  • †Oreopanax
    • †Oreopanax elongatum
  • †Ormiscus
    • †Ormiscus partitus – type locality for species
  • Mounted fossilized skeleton of the Eocene horse Orohippus
    †Orohippus
    • †Orohippus major – type locality for species
    • †Orohippus proteros
    • †Orohippus pumilus – type locality for species
    • †Orohippus sylvaticus
  • †Orthogenysuchus – type locality for genus
    • †Orthogenysuchus olseni – type locality for species
  • †Osbornodon
    • †Osbornodon brachypus – type locality for species
  • †Osmanthus
    • †Osmanthus praemissa
  • Living Osmunda ferns
    †Osmunda
    • †Osmunda affinis
  • †Osmundacidites
  • †Otarocyon
    • †Otarocyon cooki
  • †Otiorhynchites
    • †Otiorhynchites fossilis – type locality for species
    • †Otiorhynchites tysoni
  • †Otiorhynchus
    • †Otiorhynchus dubius – type locality for species
    • †Otiorhynchus perditus – type locality for species
  • †Ototriton – type locality for genus
    • †Ototriton solidus – type locality for species
  • †Ourayia
    • †Ourayia hopsoni
    • †Ourayia uintensis
  • Ovis
    • A living Ovis canadensis, or bighorn sheep
      †Ovis canadensis
  • †Oxyacodon
    • †Oxyacodon agapetillus
    • †Oxyacodon apiculatus
    • †Oxyacodon priscilla
  • †Oxyaena
    • †Oxyaena forcipata
    • †Oxyaena gulo
    • †Oxyaena intermedia
    • †Oxyaena lupina
  • †Oxyclaenus
    • †Oxyclaenus cuspidatus
  • Life restoration of a pair of the Oligocene-Miocene camel Oxydactylus. Robert Bruce Horsfall (1913).
    †Oxydactylus
    • †Oxydactylus longipes – or unidentified comparable form
    • †Oxydactylus lulli – type locality for species
    • †Oxydactylus wyomingensis
  • †Oxyprimus
    • †Oxyprimus galadrielae – type locality for species
    • †Oxyprimus putorius

P
  • Fossilized mandibles of the Paleocene-Eocene mesonychian mammal Pachyaena
    †Pachyaena
    • †Pachyaena gigantea
    • †Pachyaena gracilis
    • †Pachyaena ossifraga
  • Pachycondyla
    • †Pachycondyla labandeirai – type locality for species
  • †Pachylobius
    • †Pachylobius compressus
  • †Palaeanodon
    • †Palaeanodon ignavus
    • †Palaeanodon Ignavus
    • †Palaeanodon nievelti
    • †Palaeanodon parvulus – tentative report
  • †Palaearctonyx
    • †Palaearctonyx meadi – type locality for species
  • †Palaechthon
    • †Palaechthon alticuspis – or unidentified comparable form
    • †Palaechthon woodi
  • †Palaeictops
    • †Palaeictops bicuspis
    • †Palaeictops bridgeri
    • †Palaeictops multicuspis
  • †Palaeocarpinus
    • †Palaeocarpinus aspinosa
  • †Palaeocarya
    • †Palaeocarya clarnensis
  • †Palaeogale
    • †Palaeogale sanguinarius
    • †Palaeogale sectoria
  • Restoration of the Oligocene rabbit relative Palaeolagus
    †Palaeolagus
    • †Palaeolagus burkei
    • †Palaeolagus haydeni
    • †Palaeolagus hypsodus – type locality for species
    • †Palaeolagus intermedius
    • †Palaeolagus philoi
    • †Palaeolagus primus – type locality for species
    • †Palaeolagus temnodon
  • †Palaeonictis
    • †Palaeonictis occidentalis
    • †Palaeonictis peloria – type locality for species
    • †Palaeonictis wingi – type locality for species
  • †Palaeophasianus – type locality for genus
    • †Palaeophasianus meleagroides – type locality for species
  • †Palaeorallus – type locality for genus
    • †Palaeorallus troxelli – type locality for species
  • †Palaeoryctes
    • †Palaeoryctes cruoris – type locality for species
    • †Palaeoryctes puercensis
    • †Palaeoryctes punctatus
  • †Palaeosinomenium – or unidentified comparable form
    • †Palaeosinomenium venablesii
  • †Palaeosinopa
    • †Palaeosinopa didelphoides
    • †Palaeosinopa dorri – type locality for species
    • †Palaeosinopa incerta – type locality for species
    • †Palaeosinopa lacus – type locality for species
    • †Palaeosinopa lutreola
    • †Palaeosinopa veterrima
  • Restorative model and fossilized skull of the Eocene brontothere mammal Palaeosyops
    †Palaeosyops
    • †Palaeosyops fontinalis
    • †Palaeosyops paludosus – type locality for species
    • †Palaeosyops robustus – type locality for species
  • †Palaeotheca
    • †Palaeotheca terrestris – type locality for species
  • †Palaeoxantusia – type locality for genus
    • †Palaeoxantusia amara – type locality for species
    • †Palaeoxantusia fera – type locality for species
  • †Palatobaena – type locality for genus
    • †Palatobaena bairdi – type locality for species
    • †Palatobaena gaffneyi – type locality for species
  • †Palecphora
    • †Palecphora patefacta – type locality for species
  • †Palenochtha
    • †Palenochtha minor
    • †Palenochtha weissae – type locality for species
  • †Paleoamphiuma – type locality for genus
    • †Paleoamphiuma tetradactylum – type locality for species
  • †Paleomyrtinaea
    • †Paleomyrtinaea FW66 informal
  • †Paleonelumbo
    • †Paleonelumbo macroloba
  • †Paleonuphar
    • †Paleonuphar hesperium
  • †Paleotomus
    • †Paleotomus carbonensis – type locality for species
    • †Paleotomus milleri – type locality for species
    • †Paleotomus radagasti
  • †Palepidophyma – type locality for genus
    • †Palepidophyma lilliputiana – type locality for species
    • †Palepidophyma paradisa – type locality for species
  • Paliurus
    • †Paliurus colombi
  • †Palmocarpon
    • †Palmocarpon subcylindricum
  • †Pandaniidites
    • †Pandaniidites radicus
  • Panthera
    • A living Panthera leo, or lion
      †Panthera leo
  • †Pantolambda
    • †Pantolambda cavirictus
    • †Pantolambda intermedius – or unidentified comparable form
  • †Pantolestes
    • †Pantolestes longieundus – type locality for species
    • †Pantolestes natans – or unidentified comparable form
  • †Paracathartes
    • †Paracathartes howardae
  • †Paracosoryx
    • †Paracosoryx wilsoni
  • †Paracynarctus
    • †Paracynarctus kelloggi
  • †Paradjidaumo
    • †Paradjidaumo hypsodus
    • †Paradjidaumo trilophus
  • †Paraenhydrocyon
    • †Paraenhydrocyon josephi
    • †Paraenhydrocyon robustus
    • †Paraenhydrocyon wallovianus
  • †Paraepicrates
    • †Paraepicrates brevispondylus – type locality for species
  • †Paraglyptosaurus
    • †Paraglyptosaurus princeps – type locality for species
  • †Parahippus
    • †Parahippus pawniensis
    • †Parahippus pristinus – tentative report
    • †Parahippus wyomingensis – type locality for species
  • †Paralatindia
    • †Paralatindia saussurei – type locality for species
  • †Paramerychyus
    • †Paramerychyus harrisonensis
    • †Paramerychyus relictus
  • †Paramys
    • †Paramys adamus – type locality for species
    • †Paramys compressidens
    • †Paramys copei
    • †Paramys delicatior
    • †Paramys delicatus
    • †Paramys excavatus
    • †Paramys leptodus
    • †Paramys pycnus
    • †Paramys relictus
    • †Paramys taurus
  • †Parandrita
    • †Parandrita vestita – type locality for species
  • †Paranolis – type locality for genus
    • †Paranolis delicatus – type locality for species
  • †Paranymphaea
    • †Paranymphaea crassifolia
  • †Paranymphea
    • †Paranymphea crassifolia
  • †Parapliosaccomys
    • †Parapliosaccomys transversus
  • †Paraprionosaurus – type locality for genus
    • †Paraprionosaurus wyomingensis – type locality for species
  • †Parapternodus
    • †Parapternodus antiquus – type locality for species
  • †Pararyctes
    • †Pararyctes pattersoni – type locality for species
  • †Parasauromalus – type locality for genus
    • †Parasauromalus olseni – type locality for species
  • †Paraternstroemia
    • †Paraternstroemia hyphovenosa
  • †Paratomarctus
    • †Paratomarctus temerarius
  • Life restoration the Eocene-Oligocene camel Paratylopus (upper right)
    †Paratylopus
    • †Paratylopus labiatus
    • †Paratylopus primaevus
  • †Parectypodus
    • †Parectypodus clemensi
    • †Parectypodus lunatus
    • †Parectypodus sinclairi
    • †Parectypodus sylviae
  • †Pareumys
    • †Pareumys grangeri
  • †Parictis
    • †Parictis dakotensis
    • †Parictis gilpini
    • †Parictis parvus
    • †Parictis personi
  • †Paromomys
    • †Paromomys depressidens
    • †Paromomys maturus
  • †Parophisaurus
    • †Parophisaurus pawneensis
  • †Parvericius
    • †Parvericius montanus
  • †Parvileguminophyllum
    • †Parvileguminophyllum coloradensis
  • †Parvitragulus
    • †Parvitragulus priscus
  • Life restoration of the Eocene creodont mammal Patriofelis. Charles R. Knight (1896).
    †Patriofelis
    • †Patriofelis ferox – type locality for species
    • †Patriofelis ulta
  • †Patriomanis
    • †Patriomanis americanus
  • †Pauromys
    • †Pauromys schaubi – type locality for species
  • †Peltosaurus
  • †Pelycodus
  • †Pelycomys
    • †Pelycomys placidus
  • †Penetrigonias
    • †Penetrigonias dakotensis
  • †Penosphyllum
    • †Penosphyllum cordatum
  • †Pentacemylus – tentative report
  • †Pentacodon
  • †Pentacosmodon
    • †Pentacosmodon pronus – type locality for species
  • †Peradectes
    • †Peradectes californicus
    • †Peradectes chesteri
    • †Peradectes elegans – type locality for species
    • †Peradectes protinnaminatus
    • †Peradectes protinnominatus
  • Fossilized mandible of the Eocene-Miocene mammal Peratherium
    †Peratherium
    • †Peratherium comstocki
    • †Peratherium edwardi
    • †Peratherium marsupium
  • †Perchoerus
    • †Perchoerus minor
  • †Periptychus
    • †Periptychus carinidens
    • †Periptychus coarctatus
  • Perognathus
    • †Perognathus furlongi
  • A living Peromyscus, or deer mouse
    Peromyscus
  • Persea
    • †Persea brossiana
    • †Persea coriacea – type locality for species
    • †Persea pseudocarolinensis
  • †Perseoxylon
    • †Perseoxylon aromaticum
  • †Persites
    • †Persites argutus
  • †Petauristodon
  • †Phalaenoptilus
    • †Phalaenoptilus nuttallii
  • †Phareodus
    • †Phareodus encaustus
    • †Phareodus testis
  • †Phenacocoelus
    • †Phenacocoelus typus
  • †Phenacodaptes
    • †Phenacodaptes sabulosus – type locality for species
  • †Phenacodontid
  • Life restoration of the Paleocene-Eocene ungulate Phenacodus. Charles R. Knight (1898).
    †Phenacodus
    • †Phenacodus bisonensis – type locality for species
    • †Phenacodus grangeri
    • †Phenacodus intermedius
    • †Phenacodus magnus
    • †Phenacodus matthewi
    • †Phenacodus trilobatus
    • †Phenacodus vortmani
  • †Phenacolemur
    • †Phenacolemur fortior – type locality for species
    • †Phenacolemur mcgrewi – type locality for species
    • †Phenacolemur praecox
    • †Phenacolemur shifrae
    • †Phenacolemur simonsi
  • Phenacomys
    • †Phenacomys longicaudus
  • †Phenolia
    • †Phenolia incapax – type locality for species
  • Philhydrus
  • †Philodendron – or unidentified related form
    • †Philodendron RR61 informal
  • †Philotrox
    • †Philotrox condoni
  • Illustration of a fossilized skull in multiple views of the Oligocene-Miocene bone-crushing dog Phlaocyon
    †Phlaocyon
  • †Phoebe
  • Phragmites – tentative report
    • †Phragmites latissima
  • †Phyllites
    • †Phyllites crassifolia
    • †Phyllites demoresi
  • A living Phyllobius weevil
    Phyllobius
    • †Phyllobius avus
  • Physa
  • Phytocrene
    • †Phytocrene sordida
  • Pica
    • †Pica pica
  • †Piceoerpeton – type locality for genus
    • †Piceoerpeton willwoodense – type locality for species
  • †Picrodus
    • †Picrodus calgariensis
    • †Picrodus canpacius
    • †Picrodus silberlingi
  • †Picromomys
    • †Picromomys petersonorum – type locality for species
  • A living Pinus, or pine tree
    Pinus
    • †Pinus balli
    • †Pinus florissanti
    • †Pinus GR542 informal
    • †Pinus gracilistrobus
    • †Pinus iddingsi
    • †Pinus Lesquereux
    • †Pinus macrolepis
    • †Pinus premurrayana
    • †Pinus wardii
  • †Pipestoneomys
    • †Pipestoneomys bisulcatus – or unidentified comparable form
  • Pipilo
    • A living Pipilo chlorurus, or green-tailed towhee
      †Pipilo chlorurus
  • †Plagioctenodon
    • †Plagioctenodon krausae
    • †Plagioctenodon rosei
    • †Plagioctenodon savagei
    • †Plagioctenodon thewisseni – type locality for species
  • †Plagioctenoides
    • †Plagioctenoides microlestes
    • †Plagioctenoides tombowni
  • †Plagiomene
    • †Plagiomene accola
    • †Plagiomene multicuspis
  • †Planatus
    • †Planatus raynoldsi
  • Illustration of a branch with nuts from a Planera, or water elm tree
    †Planera
    • †Planera longifolia
  • †Planetetherium
    • †Planetetherium mirabile
  • †Planetochelys
    • †Planetochelys dithyros
  • †Planorbina
    • †Planorbina pseudoammonius
  • †Plastomenoides
    • †Plastomenoides lamberti
  • †Plastomenus
    • †Plastomenus molopinus
    • †Plastomenus oedemius – type locality for species
    • †Plastomenus tantillus – type locality for species
    • †Plastomenus thomasi
    • †Plastomenus visendus – type locality for species
  • †Plataninium
    • †Plataninium haydeni
  • †Platanophyllum
    • †Platanophyllum whitneyi
  • Leaves and fruit of a living Platanus, or plane tree
    Platanus
    • †Platanus brownii
    • †Platanus GR552 informal
    • †Platanus gracilis
    • †Platanus guillelmae
    • †Platanus montana
    • †Platanus raynoldsi
    • †Platanus raynoldsii
    • †Platanus wyomingensis
  • Platycarya
    • †Platycarya americana
    • †Platycarya BB09 informal
    • †Platycarya castaneopis
    • †Platycarya castaneopsis
  • Platynus
    • †Platynus caesus – type locality for species
    • †Platynus senex – type locality for species
  • Plecia
    • †Plecia dejecta – type locality for species
    • †Plecia pealei – type locality for species
  • Life restoration of the Paleocene-Eocene primate Plesiadapis
    †Plesiadapis
    • †Plesiadapis anceps – type locality for species
    • †Plesiadapis churchilli
    • †Plesiadapis cookei
    • †Plesiadapis dubius
    • †Plesiadapis fodinatus – type locality for species
    • †Plesiadapis gingerichi
    • †Plesiadapis praecursor
    • †Plesiadapis rex
    • †Plesiadapis simonsi – type locality for species
  • †Plesiolestes
    • †Plesiolestes problematicus – type locality for species
  • †Pliophenacomys
    • †Pliophenacomys meadensis
    • †Pliophenacomys primaevus
  • †Poabromylus
    • †Poabromylus golzi
  • †Poebrodon
  • Life restoration of the Eocene-Oligocene camel Poebrotherium
    †Poebrotherium
    • †Poebrotherium eximium
    • †Poebrotherium wilsoni
  • †Poliomyia – type locality for genus
    • †Poliomyia recta – type locality for species
  • †Pollyosbornia
    • †Pollyosbornia altidens – or unidentified comparable form
  • Polygyra
  • †Pontifactor
    • †Pontifactor bestiola – type locality for species
  • Montage of photographs in spring (top left), summer (top right), autumn (bottom left), and winter (bottom right) of Populus, or poplar tree
    Populus
    • †Populus balsamoides
    • †Populus cinnamomoides
    • †Populus daphnogenoides
    • †Populus FW60 informal
    • †Populus glandulifera
    • †Populus meigsii
    • †Populus nebraskana
    • †Populus speciosa
    • †Populus vivaria
    • †Populus wilmattae
    • †Populus wyomingiana
    • †Populus xantholithensis
  • Porzana
    • †Porzana carolina
  • †Potamogeton
  • †Premnoides
    • †Premnoides douglassi
  • Life restoration of the Paleocene-Eocene waterfowl Presbyornis
    †Presbyornis
  • †Primobucco
    • †Primobucco kistneri
    • †Primobucco mcgrewi
  • †Princetonia
    • †Princetonia yalensis
  • †Priscacara
  • †Priscachara
  • †Pristichampsus
  • †Probathyopsis
    • †Probathyopsis harrisorum
    • †Probathyopsis lysitensis
    • †Probathyopsis praecursor
  • †Problastomeryx
    • †Problastomeryx primus – type locality for species
  • †Procaimanoidea
    • †Procaimanoidea kayi – type locality for species
  • †Procamelus
    • †Procamelus grandis
  • †Procerberus
    • †Procerberus formicarum – or unidentified comparable form
    • †Procerberus grandis – or unidentified comparable form
  • †Prochetodon
    • †Prochetodon cavus – type locality for species
    • †Prochetodon foxi
    • †Prochetodon taxus – type locality for species
  • †Procydnus – tentative report
    • †Procydnus mamillanus – type locality for species
  • †Procynodictis
    • †Procynodictis vulpiceps
  • †Prodiacodon
    • †Prodiacodon concordiarcensis – type locality for species
    • †Prodiacodon furor – or unidentified comparable form
    • †Prodiacodon puercensis – or unidentified comparable form
    • †Prodiacodon tauricinerei
  • †Proharrymys
    • †Proharrymys schlaikjeri
  • †Prolimnocyon
    • †Prolimnocyon antiguus
    • †Prolimnocyon antiquus
    • †Prolimnocyon atavus
    • †Prolimnocyon eerius
    • †Prolimnocyon haematus – type locality for species
  • †Promartes
    • †Promartes lepidus
    • †Promartes olcotti
    • †Promartes vantasselensis
  • Restoration of the Miocene hippopotamus-like oreodont Promerycochoerus both onshore and in the water. Robert Bruce Horsfall (1913).
    †Promerycochoerus
    • †Promerycochoerus carrikeri
    • †Promerycochoerus superbus
  • †Promioclaenus
    • †Promioclaenus acolytus
    • †Promioclaenus pipiringosi – type locality for species
  • †Pronemobius
    • †Pronemobius induratus – type locality for species
    • †Pronemobius tertiarius – type locality for species
  • †Pronothodectes
    • †Pronothodectes jepi – type locality for species
  • †Propalaeanodon – type locality for genus
    • †Propalaeanodon schaffi – type locality for species
  • †Proscalops
    • †Proscalops miocaenus
    • †Proscalops secundus – or unidentified comparable form
  • †Prosciurus
    • †Prosciurus vetustus
  • †Protadjidaumo – tentative report
    • †Protadjidaumo typus
  • †Protagras – type locality for genus
    • †Protagras lacustris – type locality for species
  • †Protamphipteryx – type locality for genus
    • †Protamphipteryx basalis – type locality for species
  • †Prothryptacodon
    • †Prothryptacodon furens
    • †Prothryptacodon hilli – type locality for species
  • †Protictis
    • †Protictis agastor – type locality for species
    • †Protictis aprophatos
    • †Protictis haydenianus
    • †Protictis microlestes
    • †Protictis paralus
  • †Protoboysia
    • †Protoboysia complicata
  • Life restoration of a female (left) and male of the Oligocene-Miocene even-toed ungulate Protoceras. Charles R. Knight (1896).
    †Protoceras
    • †Protoceras neatodelpha – type locality for species
  • †Protochelydra
    • †Protochelydra zangerli – or unidentified comparable form
  • †Protochriacus
    • †Protochriacus simplex – or unidentified comparable form
  • †Protohippus
    • †Protohippus perditus – or unidentified comparable form
  • †Protolabis
    • †Protolabis heterodontus – or unidentified comparable form
  • †Protomarctus
    • †Protomarctus optatus
  • †Protopsalis
  • †Protoptychus
    • †Protoptychus hatcheri
  • †Protoreodon
    • †Protoreodon parvus – or unidentified comparable form
    • †Protoreodon petersoni – or unidentified comparable form
    • †Protoreodon pumilus
  • Protorohippus
    †Protorohippus
    • †Protorohippus montanum
    • †Protorohippus venticolum
  • †Protoselene – tentative report
    • †Protoselene novissimus – type locality for species
  • †Protospermophilus
    • †Protospermophilus kelloggi
  • †Protostrix
    • †Protostrix leptosteus
    • †Protostrix saurodosis – type locality for species
  • †Prototomus
    • †Prototomus deimos – type locality for species
    • †Prototomus martis – type locality for species
    • †Prototomus phobos
    • †Prototomus robustus
    • †Prototomus secundarius
  • †Protungulatum
  • Illustration of a fossilized skull of the Eocene camel Protylopus
    †Protylopus
    • †Protylopus petersoni
  • †Provaranosaurus – type locality for genus
    • †Provaranosaurus acutus – type locality for species
    • †Provaranosaurus fatuus – type locality for species
  • †Proviverroides
    • †Proviverroides piercei
  • †Proxestops
    • †Proxestops silberlingii – type locality for species
  • Prunus
    • †Prunus corrugis
    • †Prunus stewarti
  • Restoration of the Miocene cat Pseudaelurus
    †Pseudaelurus
    • †Pseudaelurus intrepidus
  • †Pseudhipparion
    • †Pseudhipparion retrusum
  • †Pseudoblastomeryx
    • †Pseudoblastomeryx advena
  • †Pseudocemophora
    • †Pseudocemophora antiqua – or unidentified comparable form
  • †Pseudocrypturus – type locality for genus
    • †Pseudocrypturus cercanaxius – type locality for species
  • †Pseudocylindrodon
    • †Pseudocylindrodon medius
    • †Pseudocylindrodon tobeyi
  • †Pseudodesmatochoerus – type locality for genus
    • †Pseudodesmatochoerus hoffmani – type locality for species
  • †Pseudolabis
    • †Pseudolabis dakotensis
  • †Pseudopalaeocastor
    • †Pseudopalaeocastor osmagnus
  • Fossilized skeleton of the Eocene protoceratid mammal Pseudoprotoceras
    †Pseudoprotoceras
    • †Pseudoprotoceras longinaris
    • †Pseudoprotoceras minor – type locality for species
    • †Pseudoprotoceras taylori
  • †Pseudotetonius
    • †Pseudotetonius ambiguus
  • †Pseudotheridomys
    • †Pseudotheridomys pagei – or unidentified comparable form
  • †Pseudotomus
    • †Pseudotomus hians – type locality for species
    • †Pseudotomus horribilis – type locality for species
    • †Pseudotomus robustus – type locality for species
  • †Psilosemys – type locality for genus
    • †Psilosemys wyomingensis – type locality for species
  • †Psilota
    • †Psilota tabidosa – type locality for species
  • Life restoration of the Paleocene taeniodont mammal Psittacotherium
    †Psittacotherium
    • †Psittacotherium multifragum
  • Ptelea
    • †Ptelea cassioides
  • Pteris – or unidentified related form
    • †Pteris silvicola
  • Pterocarya
    • †Pterocarya glabra
    • †Pterocarya hispida
    • †Pterocarya macginitii
  • †Pteromogoplistes
    • †Pteromogoplistes smithii – type locality for species
  • †Pterospermites
    • †Pterospermites haguei
  • Illustration of a fossilized skull of the Paleocene multituberculate mammal Ptilodus
    †Ptilodus
    • †Ptilodus fractus
    • †Ptilodus gnomus
    • †Ptilodus kummae
    • †Ptilodus mediaevus
    • †Ptilodus montanus – or unidentified comparable form
    • †Ptilodus tsosiensis – or unidentified comparable form
    • †Ptilodus wyomingensis – type locality for species
  • †Pulverflumen
    • †Pulverflumen magnificum – type locality for species
  • Puma
    • †Puma concolor
  • Pupilla – or unidentified comparable form
  • †Pyramidula
    • †Pyramidula ralstonensis
  • †Pyrocyon
    • †Pyrocyon dioctetus

Q
  • †Quadratomus
    • †Quadratomus grandis
    • †Quadratomus grossus
    • †Quadratomus sundelli
  • †Quercinium
    • †Quercinium knowltoni
    • †Quercinium lamarense
  • A living Quercus, or oak tree
    Quercus
    • †Quercus consimilis – tentative report
    • †Quercus culveri
    • †Quercus cuneatus – type locality for species
    • †Quercus drymeja
    • †Quercus furcinervis
    • †Quercus GR522 informal
    • †Quercus GR575 informal
    • †Quercus greenlandica
    • †Quercus grosidentata
    • †Quercus hesperia
    • †Quercus magnifolia
    • †Quercus olafseni
    • †Quercus petros – type locality for species
    • †Quercus sullyi
    • †Quercus weedii
    • †Quercus yanceyi
  • †Quereuxia
    • †Quereuxia angulata
  • A living Quiscalus, or grackle
    Quiscalus – or unidentified comparable form

R
  • Life restoration of the Miocene-Pliocene pronghorn Ramoceros and Cosoryx. Robert Bruce Horsfall (1913).
    †Ramoceros
  • †Rapamys
    • †Rapamys wilsoni
  • †Raphictis
    • †Raphictis gausion – type locality for species
  • †Reithroparamyine
  • †Reithroparamys
    • †Reithroparamys delicatissimus – type locality for species
    • †Reithroparamys huerfanensis
  • †Restes – type locality for genus
    • †Restes rugosus – type locality for species
  • †Reticuloidosporites
    • †Reticuloidosporites pseudomurii
  • †Rhamnacinium
    • †Rhamnacinium radiatum
  • †Rhamnus
    • †Rhamnus cleburni
    • †Rhamnus hirsuta
    • †Rhamnus rectinervis
  • Rhineura – type locality for genus
    • †Rhineura hatcherii – type locality for species
  • Rhinoclemmys – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Rhinoclemmys terrestris
  • Rhus
    • †Rhus mixta – tentative report
    • A Rhus nigricans leaf
      †Rhus nigricans
  • †Rhyssa
    • †Rhyssa juvenis – type locality for species
  • Flowers of a living Robinia
    †Robinia
    • †Robinia wardi
  • Rosa
    • †Rosa hilliae
  • †Rymosia
    • †Rymosia strangulata – type locality for species

S
  • Living Sabal, or palmettos
    Sabal
    • †Sabal grayana
    • †Sabal powelli
  • †Sabalitesamesoneuron
    • †Sabalitesamesoneuron RR34 informal
  • †Saccoloma
    • †Saccoloma gardneri
  • †Sackenia
    • †Sackenia gibbosa – type locality for species
  • †Salilx
    • †Salilx longiacuminata
  • A living Salix, or willow
    Salix
    • †Salix angusta
    • †Salix aquilina
    • †Salix cockerelli
    • †Salix elongata – tentative report
    • †Salix lavateri
    • †Salix varians
  • †Salpinctes – or unidentified comparable form
    • †Salpinctes obsoletus
  • †Salvinia
    • †Salvinia preauriculata
  • †Sanctimus
    • †Sanctimus simonisi – type locality for species
    • †Sanctimus stouti – type locality for species
    • †Sanctimus stuartae
  • Fossilized skeleton of the Eocene monitor lizard Saniwa
    †Saniwa – type locality for genus
    • †Saniwa ensidens – type locality for species
    • †Saniwa major – type locality for species
    • †Saniwa stenodon
  • †Sapindaceous
  • †Sapindus
    • †Sapindus alatus
    • †Sapindus grandifolioloides
    • †Sapindus grandifoliolus
    • †Sapindus wardii
  • Sassafras
    • †Sassafras thermale
  • †Scalopoides
  • †Scapherpeton
    • †Scapherpeton tectum
  • †Scenopagus
    • †Scenopagus curtidens
    • †Scenopagus edenensis
    • †Scenopagus hewettensis – type locality for species
    • †Scenopagus priscus
  • †Schaubeumys
    • †Schaubeumys sabrae
  • †Schizodontomys
    • †Schizodontomys harkseni
    • †Schizodontomys sulcidens
  • Foliage of a living Schoepfia
    †Schoepfia
    • †Schoepfia republicensis
  • Sciara
    • †Sciara scopuli – type locality for species
  • †Scincoideus
    • †Scincoideus grassator – type locality for species
  • Sciomyza – tentative report
    • †Sciomyza disjecta – type locality for species
    • †Sciomyza manca – type locality for species
  • †Sciophila
    • †Sciophila hyatti – type locality for species
  • †Sciuravus
    • †Sciuravus bridgeri – type locality for species
    • †Sciuravus nitidus – type locality for species
    • †Sciuravus popi – or unidentified comparable form
    • †Sciuravus wilsoni
  • †Scottimus
    • †Scottimus ambiguus – or unidentified comparable form
    • †Scottimus kellamorum – type locality for species
    • †Scottimus viduus
  • †Selenaletes
    • †Selenaletes scopaeus
  • Sequoia
    • †Sequoia couttsiae
    • †Sequoia langsdorfii
    • †Sequoia magnifica
  • Life restoration of two species of the Oligocene oreodont mammal genus Sespia
    †Sespia
    • †Sespia nitida
  • †Shoshonius
    • †Shoshonius bowni
    • †Shoshonius cooperi
  • †Sialia
  • †Sifrhippus
    • †Sifrhippus grangeri
    • †Sifrhippus sandrae
  • †Sigynorum – type locality for genus
    • †Sigynorum magnadivisus – type locality for species
  • †Simoedosaurus
  • †Simpsonictis
    • †Simpsonictis jaynanneae – type locality for species
    • †Simpsonictis pegus – type locality for species
    • †Simpsonictis tenuis
  • †Simpsonlemur
    • †Simpsonlemur citatus
    • †Simpsonlemur jepseni – or unidentified comparable form
  • †Sinclairella
  • †Sinomenium – or unidentified related form
    • †Sinomenium RR08 informal
  • Fossilized skeleton of the Eocene-Oligocene creodont mammal Sinopa
    †Sinopa
    • †Sinopa agilis – type locality for species
    • †Sinopa major – type locality for species
    • †Sinopa minor
    • †Sinopa rapax – type locality for species
    • †Sinopa viverrinus
  • †Siphonophoroides
    • †Siphonophoroides antiqua – tentative report
  • Siren
    • †Siren dunni – type locality for species
  • Sitona
    • †Sitona grandaevus – type locality for species
    • †Sitona paginarum
  • Sloanea – or unidentified related form
    • †Sloanea RR18 informal
  • †Smilax
    • †Smilax GR550 informal
    • †Smilax lamarensis
  • Mounted fossilized skeleton of the Eocene primate Smilodectes
    †Smilodectes
    • †Smilodectes gibossus – type locality for species
    • †Smilodectes gracilis – type locality for species
    • †Smilodectes mcgrewi – type locality for species
    • †Smilodectes sororis – type locality for species
  • Sorex
    • †Sorex hoyi
  • †Sparganium
    • †Sparganium stygium
  • †Spathorhynchus – type locality for genus
    • †Spathorhynchus fossorium – type locality for species
    • †Spathorhynchus natronicus
  • Spermophilus
    • †Spermophilus primitivus
    • †Spermophilus variegatus
  • †Sphacorhysis
    • †Sphacorhysis burntforkensis – type locality for species
  • Life restoration of the Eocene brontothere mammal Sphenocoelus
    †Sphenocoelus
    • †Sphenocoelus hyognathus
    • †Sphenocoelus uintensis
  • Spirodela
    • †Spirodela magna
  • †Spiza
    • †Spiza americana
  • †Spurimus
    • †Spurimus scotti
    • †Spurimus selbyi
  • Stagnicola
  • †Staphylinites
    • †Staphylinites obsoletum – type locality for species
  • †Stegobium
    • †Stegobium defunctus – type locality for species
  • †Steinius
    • †Steinius annectens – type locality for species
    • †Steinius vespertinus
  • †Steneofiber
    • †Steneofiber fossor
    • †Steneofiber gradatus
  • †Stenocinclis – type locality for genus
    • †Stenocinclis anomala – type locality for species
  • †Stenogomphus
    • †Stenogomphus scudderi – type locality for species
  • Life restoration of the Oligocene-Miocene camel Stenomylus
    †Stenomylus
    • †Stenomylus gracilis
    • †Stenomylus hitchcocki
    • †Stenomylus keelinensis
  • †Stenopelta
    • †Stenopelta punctulata – type locality for species
  • Sterculia
    • †Sterculia coloradensis
  • †Stibarus
    • †Stibarus quadricuspis
    • †Stibarus yoderensis
  • †Stillingia
    • †Stillingia casca
  • †Straitopollis
    • †Straitopollis tectatus
  • †Strigorhysis – type locality for genus
    • †Strigorhysis bridgerensis – type locality for species
    • †Strigorhysis rugosus
  • Sturnella
    • †Sturnella neglecta
  • †Stygimys
    • †Stygimys gratus
    • †Stygimys kuszmauli
  • Mounted fossilized skeleton of the Eocene-Oligocene tortoise Stylemys
    †Stylemys
    • †Stylemys nebrascensis
  • †Stylinodon
    • †Stylinodon mirus – type locality for species
  • †Styrax
    • †Styrax transversa
  • †Subhyracodon
    • †Subhyracodon mitis
    • †Subhyracodon occidentalis
  • Surnia
    • †Surnia ulula
  • †Suzanniwana – type locality for genus
    • †Suzanniwana patriciana – type locality for species
    • †Suzanniwana revenanta – type locality for species
  • †Swaindelphys
    • †Swaindelphys cifellii – type locality for species
  • †Swainiguanoides – type locality for genus
    • †Swainiguanoides milleri – type locality for species
  • †Swartzia
    • †Swartzia wardelii – type locality for species
  • Sylvicola – type locality for genus
    • †Sylvicola cadaver – type locality for species
  • Sylvilagus
  • Symplocos
    • †Symplocos exilis
  • Synaptomys
  • †Syncolporites
    • †Syncolporites minimus
  • Life restoration of the Miocene protoceratid mammal Syndyoceras
    †Syndyoceras
    • †Syndyoceras cooki
  • †Syntomostylus
    • †Syntomostylus fortis – type locality for species
  • Syrphus
  • †Systemodon
    • †Systemodon tapirinus
  • †Syzygioides
    • †Syzygioides americana

T
  • Tachycineta – or unidentified comparable form
    • †Tachycineta bicolor
  • Restoration of the Paleocene multituberculate mammal Taeniolabis
    †Taeniolabis
    • †Taeniolabis taoensis
  • †Talpavoides
    • †Talpavoides dartoni – type locality for species
  • †Talpavus
    • †Talpavus duplus
    • †Talpavus nitidus
    • †Talpavus sullivani – type locality for species
  • Tamias
    • †Tamias ateles – or unidentified comparable form
  • †Tanymykter
    • †Tanymykter brachyodontus
  • Life restoration of the Eocene carnivoran relative Tapocyon
    †Tapocyon
    • †Tapocyon robustus – or unidentified comparable form
  • †Tarka
    • †Tarka stylifera
  • †Tatmanius – type locality for genus
    • †Tatmanius szalayi – type locality for species
  • Taxidea
    • †Taxidea taxus
  • †Taxites
    • †Taxites olriki
  • Taxodium
    • †Taxodium olriki
    • †Taxodium olrikii
  • †Taxonus
    • †Taxonus nortoni – type locality for species
  • †Taxymys
    • †Taxymys lucaris
  • Fossilized mandible of the Eocene primate Teilhardina
    †Teilhardina
    • †Teilhardina americana – type locality for species. Late reclassified in the new genus Bownomomys as the species B. americanus.[2]
    • †Teilhardina brandti – type locality for species
    • †Teilhardina crassidens – type locality for species. Later reclassified as Bownomomys crassidens.[2]
    • †Teilhardina demissa – type locality for species
    • †Teilhardina gingerichi
    • †Teilhardina mathewi
    • †Teilhardina tenuicula
  • †Teleoceras
  • †Telmatherium
    • †Telmatherium validum – or unidentified comparable form
    • †Telmatherium validus – type locality for species
  • †Telmatrechus
    • †Telmatrechus parallelus – type locality for species
  • †Temnocyon
    • †Temnocyon macrogenys – type locality for species
  • †Temnotrionyx – type locality for genus
    • †Temnotrionyx manducans – type locality for species
  • †Teretrum
    • †Teretrum quiescitum – type locality for species
  • †Ternstroemites
    • †Ternstroemites aureavallis
  • †Tetigonia
    • †Tetigonia priscomarginata – type locality for species
    • †Tetigonia priscovariegata – type locality for species
  • †Tetonius
    • †Tetonius matthewi – type locality for species
  • †Tetonoides
    • †Tetonoides pearcei
  • †Tetraclaenodon
    • †Tetraclaenodon puercensis
  • †Tetrapassalus
    • †Tetrapassalus proius – type locality for species
  • †Thamnotettix
    • †Thamnotettix gannetti – type locality for species
    • †Thamnotettix mutilata – type locality for species
  • A modern uprooted Thelypteris, or maiden fern
    Thelypteris
    • †Thelypteris iddingsi
    • †Thelypteris iddingsii
  • †Thinocyon
  • †Thisbemys
    • †Thisbemys brevicrista
    • †Thisbemys corrugatus – type locality for species
    • †Thisbemys perditus
  • †Thouinia
    • †Thouinia eocenica
  • †Thryptacodon
    • †Thryptacodon antiquus
    • †Thryptacodon australis
    • †Thryptacodon barae
    • †Thryptacodon orthogonius – type locality for species
    • †Thryptacodon pseudarctos
  • †Thuites
    • †Thuites interruptus
  • †Thuja
    • †Thuja interrupta
    • †Thuja interruptus
  • †Thylacaelurus
    • †Thylacaelurus montanus – or unidentified comparable form
  • †Thylacodon
    • †Thylacodon pusillus
  • A living member of Tilia, the genus including the lindens and basswoods
    Tilia
    • †Tilia populifolia
  • †Tillodon
    • †Tillodon fodiens – type locality for species
  • †Tillomys
    • †Tillomys parvidens – type locality for species
    • †Tillomys senex
  • †Tinimomys
    • †Tinimomys graybulliensis
    • †Tinimomys loomisi
    • †Tinimomys tribos – type locality for species
  • Tinosaurus – type locality for genus
    • †Tinosaurus pristinus – type locality for species
    • †Tinosaurus stenodon – type locality for species
  • Tipula
    • †Tipula sepulchri – type locality for species
    • †Tipula spoliata – type locality for species
  • Life restoration of the Paleocene pantodont mammal Titanoides
    †Titanoides
    • †Titanoides gidleyi – type locality for species
    • †Titanoides major
    • †Titanoides nanus – type locality for species
    • †Titanoides primaevus
  • †Titanomyrma
    • Titanomyrma lubei with a rufous hummingbird for scale
      †Titanomyrma lubei – type locality for species
  • †Torrejonia
    • †Torrejonia sirokyi – type locality for species
  • †Toxotherium
    • †Toxotherium hunteri
  • Trapa
    • †Trapa angulata
    • †Trapa paulula
  • †Tremanotus
    • †Tremanotus angustata
  • †Triatriopollenites
    • †Triatriopollenites granulatus
    • †Triatriopollenites granulus
  • †Tricalpites
    • †Tricalpites parvus
  • †Tricentes
    • †Tricentes subtrigonus
  • †Tricolpites
    • †Tricolpites anguloluminosus + bathyreticulatus
    • †Tricolpites anguloluminosus + bothyreticulatus
    • †Tricolpites angulolumonosus + bathyreticulatus
    • †Tricolpites mutabilis
    • †Tricolpites parvus
  • †Trigenicus
    • †Trigenicus profectus
  • †Trigonias
    • †Trigonias osborni
  • †Trigonorhinus
    • †Trigonorhinus pristinus – type locality for species
  • Trionyx
    • †Trionyx concentricus – type locality for species
    • †Trionyx thomasii – type locality for species
  • †Triplopus
    • †Triplopus cubitalis – type locality for species
    • †Triplopus implicatus – type locality for species
    • †Triplopus obliquidens – or unidentified comparable form
  • Life restoration of the Eocene creodont mammal Tritemnodon
    †Tritemnodon
    • †Tritemnodon strenuus
  • †Tritoma
    • †Tritoma binotata – type locality for species
  • †Triumfetta
    • †Triumfetta ovata
  • †Trochodendroides
    • †Trochodendroides flabella
  • †Trogolemur
    • †Trogolemur amplior – type locality for species
    • †Trogolemur fragilis – type locality for species
    • †Trogolemur myodes – type locality for species
  • †Trogosus
    • †Trogosus castoridens – type locality for species
    • †Trogosus gazini – type locality for species
    • †Trogosus latidens
  • †Tropideres
    • †Tropideres remotus – type locality for species
  • †Tropisternus
    • †Tropisternus saxialis – type locality for species
    • †Tropisternus sculptilis – type locality for species
  • †Trypodendron
    • †Trypodendron impressus – type locality for species
  • †Tsoabichi – type locality for genus
    • †Tsoabichi greenriverensis – type locality for species
  • †Tubulodon
    • †Tubulodon atopum
    • †Tubulodon pearcei
    • †Tubulodon taylori
    • †Tubulodon woodi
  • Turdus – or unidentified comparable form
    • †Turdus migratorius
  • †Tuscahomys
    • †Tuscahomys ctenodactylops – type locality for species
    • †Tuscahomys major – or unidentified comparable form
    • †Tuscahomys walshi – type locality for species
    • †Tuscahomys worlandensis
  • †Tylocephalonyx
    • †Tylocephalonyx skinneri
  • Tympanuchus
    • A living Tympanuchus phasianellus, or sharp-tailed grouse
      †Tympanuchus phasianellus
  • Typha – or unidentified related form
  • †Tytthaena
    • †Tytthaena lichna
    • †Tytthaena parrisi – type locality for species

U
  • †Uintaceras
    • †Uintaceras radinskyi
  • †Uintacyon
    • †Uintacyon asodes
    • †Uintacyon gingerichi
    • †Uintacyon jugulans – type locality for species
    • †Uintacyon massetericus
    • †Uintacyon rudis
  • †Uintanius
    • †Uintanius ameghini
    • †Uintanius rutherfurdi
  • †Uintasorex
    • †Uintasorex parvulus – type locality for species
  • Life restoration of the Eocene mammal Uintatherium
    †Uintatherium – type locality for genus
    • †Uintatherium anceps – type locality for species
  • †Uintornis – type locality for genus
    • †Uintornis lucaris – type locality for species
    • †Uintornis marionae – type locality for species
  • Ulmus
    • †Ulmus microphylla
    • †Ulmus minima – tentative report
    • †Ulmus rhamnifolia
  • Unio
  • †Unuchinia
    • †Unuchinia diaphanes – type locality for species
    • †Unuchinia dysmathes
  • Ursus
    • A living Ursus arctos, or brown bear
      †Ursus arctos
  • †Ustatochoerus
    • †Ustatochoerus medius
  • †Utahia
    • †Utahia carina – type locality for species
  • †Utemylus
    • †Utemylus serior – type locality for species

V
  • †Valenia
    • †Valenia wilsoni
  • †Valenopsalis
    • †Valenopsalis joyneri
  • †Vassacyon
    • †Vassacyon bowni – type locality for species
    • †Vassacyon promicrodon
  • †Vauquelinia
    • †Vauquelinia comptonifolia
  • †Viburnum
    • †Viburnum antiquorum
    • †Viburnum antiquum
    • †Viburnum asperum
  • †Vinea – or unidentified comparable form
    • †Vinea pugetensis
  • Leaves and fruit of a living Vitis, or grapevine
    Vitis
    • †Vitis olriki
    • †Vitis stantoni
  • †Viverravus
    • †Viverravus acutus
    • †Viverravus acutus/gracilis informal
    • †Viverravus browni
    • †Viverravus gracilis – type locality for species
    • †Viverravus laytoni
    • †Viverravus lutosus
    • †Viverravus minutus – type locality for species
    • †Viverravus politus
    • †Viverravus rosei – type locality for species
    • †Viverravus sicarius
  • Viviparus
  • Mounted fossilized skeleton of the Eocene mammal Vulpavus
    †Vulpavus
    • †Vulpavus australis
    • †Vulpavus canavus
    • †Vulpavus farsonensis – type locality for species
    • †Vulpavus hargeri
    • †Vulpavus ovatus – type locality for species
    • †Vulpavus palustris – type locality for species
    • †Vulpavus profectus – type locality for species
    • †Vulpavus simplex
  • Vulpes
    • A living Vulpes vulpes, or red fox
      †Vulpes vulpes

W
  • †Washakius
    • †Washakius insignis
    • †Washakius izetti
  • †Wickia
    • †Wickia brevirhinus – or unidentified comparable form
  • †Wilsoneumys
    • †Wilsoneumys planidens
  • Living Woodwardia ferns
    †Woodwardia
    • †Woodwardia arctica
    • †Woodwardia gravida
    • †Woodwardia preareolata
  • †Worlandia
    • †Worlandia inusitata – type locality for species
  • †Wrightohyus
    • †Wrightohyus yatkolai
  • †Wyolestes
    • †Wyolestes apheles
    • †Wyolestes dioctes – type locality for species
  • †Wyomomys
    • †Wyomomys bridgeri – type locality for species
  • †Wyomylus – type locality for genus
    • †Wyomylus whitei – type locality for species
  • †Wyonycteris – type locality for genus
    • †Wyonycteris chalix – type locality for species

X
  • †Xanclomys
    • †Xanclomys mcgrewi – type locality for species
  • †Xenicohippus
    • †Xenicohippus craspedotum
    • †Xenicohippus grangeri
  • †Xenochelys
    • †Xenochelys bridgerensis – type locality for species
    • †Xenochelys formosa
    • †Xenochelys lostcabinensis – type locality for species
  • †Xenocranium
  • †Xestops
    • †Xestops gracilis – type locality for species
    • †Xestops lentus – type locality for species
    • †Xestops microdus – type locality for species
    • †Xestops minutus – type locality for species
    • †Xestops piercei – type locality for species
    • †Xestops savagei – type locality for species
    • †Xestops vagans – type locality for species
    • †Xestops vagrans
  • †Xyronomys
    • †Xyronomys swainae – type locality for species

Y
  • †Yoderimys – type locality for genus
    • †Yoderimys bumpi – type locality for species
    • †Yoderimys stewarti
  • Life restoration of the Miocene bear dog Ysengrinia
    †Ysengrinia
    • †Ysengrinia americana

Z
  • †Zamia
    • †Zamia coloradensis
    • †Zamia colorodensis
    • †Zamia wyomingensis
  • †Zangerlichelys
    • †Zangerlichelys aequa
  • †Zanycteris
    • †Zanycteris paleocenus
  • Zelkova
    • †Zelkova nervosa
  • †Zemiodontomys
    • †Zemiodontomys burkei
  • Zenaida
    • †Zenaida rnacroura
  • †Ziamys – or unidentified comparable form
  • †Zingiberopsis
    • †Zingiberopsis isonervosa
  • Zizyphus
    • †Zizyphus serrulatus
  • †Zodiolestes
  • Zonotrichia
    • A living Zonotrichia albicollis, or white-throated sparrow
      †Zonotrichia albicollis
gollark: I MAY have to go back in time and erase "shingled magnetic recording" from existence.
gollark: They don't seem to have many WD disks in that.
gollark: Hmm. Perhaps seagate somewhat bad then.
gollark: ```ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 2 3 Spin_Up_Time 0x0027 179 171 021 Pre-fail Always - 2033 4 Start_Stop_Count 0x0032 001 001 000 Old_age Always - 168316 5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0 7 Seek_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0 9 Power_On_Hours 0x0032 079 079 000 Old_age Always - 15354 10 Spin_Retry_Count 0x0032 100 100 000 Old_age Always - 0 11 Calibration_Retry_Count 0x0032 100 100 000 Old_age Always - 0 12 Power_Cycle_Count 0x0032 098 098 000 Old_age Always - 2564192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 320193 Load_Cycle_Count 0x0032 088 088 000 Old_age Always - 336830194 Temperature_Celsius 0x0022 126 080 000 Old_age Always - 21196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 2200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age Offline - 0240 Head_Flying_Hours 0x0032 088 088 000 Old_age Always - 8931```Wow, this disk is in a great state.
gollark: I don't see why I would want dead ones.

References
  1. Patrick S. Herendeen; Fabiany Herrera (2019). "Eocene fossil legume leaves referable to the extant genus Arcoa (Caesalpinioideae, Leguminosae)". International Journal of Plant Sciences. 180 (3): 220–231. doi:10.1086/701468.
  2. Paul E. Morse; Stephen G.B. Chester; Doug M. Boyer; Thierry Smith; Richard Smith; Paul Gigase; Jonathan I. Bloch (2019). "New fossils, systematics, and biogeography of the oldest known crown primate Teilhardina from the earliest Eocene of Asia, Europe, and North America". Journal of Human Evolution. 128: 103–131. doi:10.1016/j.jhevol.2018.08.005. PMID 30497682.
  3. Daniel T. Ksepka; Lance Grande; Gerald Mayr (2019). "Oldest finch-beaked birds reveal parallel ecological radiations in the earliest evolution of passerines". Current Biology. 29 (4): 657–663.e1. doi:10.1016/j.cub.2018.12.040. PMID 30744971.
  4. Daniel T. Ksepka; Lance Grande; Gerald Mayr (2019). "Oldest finch-beaked birds reveal parallel ecological radiations in the earliest evolution of passerines". Current Biology. 29 (4): 657–663.e1. doi:10.1016/j.cub.2018.12.040. PMID 30744971.
  5. Bin Bai; Yuan-Qing Wang; Jin Meng (2019). "A new late Paleocene phenacodontid 'condylarth' Lophocion from the Clark's Fork Basin of Wyoming". Historical Biology: An International Journal of Paleobiology. in press: 1–8. doi:10.1080/08912963.2019.1652283.
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