List of the Cenozoic life of Colorado

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

A

 * Red fir.jpg [[Abies]]
 * †Abies longirostris
 * †Absarokius
 * †Absarokius abbotti – or unidentified comparable form
 * †Absarokius metoecus
 * †Absyrtus
 * †Absyrtus decrepitus – type locality for species
 * †Acaenitus
 * †Acaenitus defunctus – type locality for species
 * †Acalles
 * †Acalles exhumatus – type locality for species
 * †Acallomyia
 * †Acallomyia probolaea – type locality for species
 * †Acalyptus
 * †Acalyptus obtusus – type locality for species
 * †Acanthomyites – type locality for genus
 * †Acanthomyites aldrichi – type locality for species
 * †Acarictis – or unidentified comparable form
 * †Acarictis ryani
 * Acer
 * †Acer florissanti
 * †Acer fragile
 * †Acer macginitiei
 * †Acer oregonianum
 * †Achrestocoris – type locality for genus
 * †Achrestocoris cinerarius – type locality for species
 * †Acilius
 * †Acilius florissantensis – type locality for species
 * †Aciprion – type locality for genus
 * †Aciprion formosum – type locality for species
 * †Aciprion majus – type locality for species
 * †Acnemia
 * †Acnemia cyclosoma – type locality for species
 * †Acocephalus
 * †Acocephalus callosus – type locality for species
 * Acris
 * †Acritoparamys
 * †Acritoparamys atwateri
 * †Acritoparamys pattersoni
 * Acrostichum
 * †Acrostichum hesperium
 * †Acylophorus
 * †Acylophorus immotus – type locality for species
 * †Adalia
 * †Adalia subversa – type locality for species
 * †Adelocera
 * †Adelocera perantiqua – type locality for species
 * †Adelopsyche – type locality for genus
 * †Adelopsyche frustrans – type locality for species
 * †Adjidaumo
 * †Adjidaumo minimus
 * †Adjidaumo minutus
 * Adocidae - Adocus punctatus.jpg†[[Adocus]]
 * Aegialia
 * †Aegialia opaca
 * †Aelurodon
 * †Aelurodon asthenostylus
 * Aepycamelus Alticamelus hharder.jpg †[[Aepycamelus]]
 * †Aepycamelus giraffinus
 * Aeshna
 * †Aeshna larvata – type locality for species
 * †Aeshna solida – type locality for species
 * Agabus
 * †Agabus charon – type locality for species
 * †Agabus florissantensis – type locality for species
 * †Agabus infuscatus
 * †Agabus rathbuni – type locality for species
 * †Agallia
 * †Agallia abstructa – type locality for species
 * †Agallia flaccida – type locality for species
 * †Agallia instabilis – type locality for species
 * †Agallia lewisii – type locality for species
 * †Agathemera
 * †Agathemera reclusa – type locality for species
 * Red-winged blackbird.jpg [[Agelaius]]
 * †Agelaius phoenicieus
 * †Agenia
 * †Agenia cockerellae – type locality for species
 * †Agenia saxigena – type locality for species
 * †Agnotocastor
 * †Agnotocastor coloradensis – type locality for species
 * Agoliinus
 * †Agoliinus plutonicus
 * Agrilus
 * †Agrilus liragus
 * †Agrilus praepolitus – type locality for species
 * †Agrion
 * †Agrion exsularis – type locality for species
 * †Agrion mascescens – type locality for species
 * †Agrion telluris – type locality for species
 * Agriotes.gallicus.jpg [[Agriotes]]
 * †Agriotes apicalis
 * †Agriotes comminutus – type locality for species
 * †Agriotes nearcticus – type locality for species
 * †Agromyza
 * †Agromyza praecursor – type locality for species
 * †Agulla
 * †Agulla protomaculata – type locality for species
 * †Agyrtes
 * †Agyrtes primoticus – type locality for species
 * †Ailanthus
 * †Ailanthus americana
 * †Ailanthus lesquereuxi
 * †Aleocharopsis
 * †Aleocharopsis caseyi – type locality for species
 * †Aleocharopsis secunda – type locality for species
 * †Alepidophora – type locality for genus
 * †Alepidophora cockerelli – type locality for species
 * †Alepidophora minor – type locality for species
 * †Alepidophora pealei – type locality for species
 * †Aletodon
 * †Aletodon gunnelli – or unidentified comparable form
 * Aleurites
 * †Aleurites glandulosa
 * †Alforjas – tentative report
 * †Alismaphyllites
 * †Alismaphyllites grandifolius
 * †Allantodiopsis
 * †Allantodiopsis erosa
 * Allognathosuchus gracilis.jpg †[[Allognathosuchus]]
 * †Allognathosuchus polyodon
 * †Allophaiomys
 * †Allophaiomys pliocaenicus
 * †Allophylus
 * †Allophylus flexifolia
 * †Alomatia – type locality for genus
 * †Alomatia fusca – type locality for species
 * Altica
 * †Altica renovata – type locality for species
 * †Alticonus – type locality for genus
 * †Alticonus gazini – type locality for species
 * †Alysia
 * †Alysia exigua – type locality for species
 * †Alysia petrina – type locality for species
 * †Alysia phanerognatha – type locality for species
 * †Alysia ruskii – type locality for species
 * Amara
 * †Amara cockerelli – type locality for species
 * †Amara danae – type locality for species
 * †Amara powellii – type locality for species
 * †Amara revocata – type locality for species
 * †Amara sterilis
 * †Amara veterata – type locality for species
 * †Amartus
 * †Amartus petrefactus – type locality for species
 * †Amauropilio
 * †Amauropilio atavus – type locality for species
 * †Amauropilio lacoei – type locality for species
 * †Amblycorypha – tentative report
 * †Amblycorypha perdita – type locality for species
 * †Amblyteles
 * †Amblyteles pealei – type locality for species
 * †Ambystoma
 * †Ambystoma alamosensis – type locality for species
 * †Ambystoma tigrinum
 * Amebelodon fricki.jpg †[[Amebelodon]]
 * †Amebelodon floridanus
 * Amelanchier
 * †Amelanchier peritula
 * †Amelanchier scudderi
 * Amia
 * †Ammophila
 * †Ammophila antiquella – type locality for species
 * †Ampelopsis
 * †Ampelopsis acerifolia
 * †Amphechinus
 * †Amphechinus horncloudi
 * †Amphicerus
 * †Amphicerus sublaevis
 * Amphicosmus
 * †Amphicosmus delicatulus – type locality for species
 * †Amphicyon
 * †Amphicyon galushai
 * †Amphicyon ingens
 * †Amphicyrta
 * †Amphicyrta inhaesa – type locality for species
 * Machairodus giganteus 1.jpg †[[Amphimachairodus]]
 * †Amphimachairodus coloradensis
 * †Ampliconus – type locality for genus
 * †Ampliconus browni – type locality for species
 * †Anabrus
 * †Anabrus caudelli – type locality for species
 * Anas
 * †Anasa
 * †Anasa priscoputida – type locality for species
 * †Anatis
 * †Anatis resurgens – type locality for species
 * †Anchastus
 * †Anchastus diluvialis – type locality for species
 * †Anchastus eruptus – type locality for species
 * †Anchitherium
 * †Anconatus – type locality for genus
 * †Anconatus dorsuosus – type locality for species
 * †Anconatus niger – type locality for species
 * Andrena
 * †Andrena clavula – type locality for species
 * †Andrena grandipes – type locality for species
 * †Andrena hypolitha – type locality for species
 * †Andrena lagopus
 * †Andrena percontusa – type locality for species
 * †Andrena sepulta – type locality for species
 * †Andrenopteryx
 * †Andrenopteryx willardi
 * †Andrias
 * †Andrias matthewi
 * †Andricus
 * †Andricus myricae – type locality for species
 * †Anelaphus
 * †Anelaphus extinctus – type locality for species
 * †Anemia
 * †Anemia elongata
 * 4-25 Angustidens.jpg]] †Angustidens''
 * †Angustidens vireti
 * †Anisonchus
 * †Anisonchus athelas – or unidentified comparable form
 * Anisotoma
 * †Anisotoma sibylla – type locality for species
 * †Ankylodon
 * †Ankylodon annectens
 * †Anobium
 * †Anobium durescens – type locality for species
 * †Anomala
 * †Anomala exterranea – type locality for species
 * †Anomala scudderi – type locality for species
 * †Anomalon
 * †Anomalon deletum – type locality for species
 * †Anomalon excisum – type locality for species
 * †Anomalon miocenicum – type locality for species
 * Anser
 * †Antas
 * †Antas crecca
 * Anthaxia binotata Rey, 1891 (3005098489) (2).jpg [[Anthaxia]]
 * †Anthaxia exhumata – type locality for species
 * †Anthaxia prasina
 * †Antherophagus
 * †Antherophagus megalops – type locality for species
 * †Anthidium
 * †Anthidium exhumatum – type locality for species
 * †Anthidium scudderi – type locality for species
 * †Antholithes
 * †Antholithes amoenus
 * †Antholithes pediloides
 * Anthomyia species IMG 2693s.jpg †[[Anthomyia]]
 * †Anthomyia atavella – type locality for species
 * †Anthomyia laminarum – type locality for species
 * †Anthomyia persepulta – type locality for species
 * †Anthomyia winchesteri – type locality for species
 * Anthonomus
 * †Anthonomus concussus – type locality for species
 * †Anthonomus debilatus – type locality for species
 * †Anthonomus defossus – type locality for species
 * †Anthonomus evigilatus – type locality for species
 * †Anthonomus primordius – type locality for species
 * †Anthonomus rohweri – type locality for species
 * †Anthonomus soporus
 * †Anthophora
 * †Anthophora melfordi – type locality for species
 * †Antiacodon
 * †Antiacodon pygmaeus
 * Antilocapra americana.jpg [[Antilocapra]]
 * †Antilocapra americana
 * †Antocha
 * †Antocha principialis – type locality for species
 * †Apanthesis – type locality for genus
 * †Apanthesis leuce – type locality for species
 * †Apatosciuravus
 * †Apatosciuravus bifax
 * †Aphaena
 * †Aphaena atava – type locality for species
 * Aphaenogaster
 * †Aphaenogaster donisthorpei – type locality for species
 * †Aphaenogaster mayri – type locality for species
 * †Apheliscus
 * †Aphelops
 * †Aphelops malacorhinus
 * †Aphelops megalodus
 * †Aphelops mutilus
 * †Aphidopsis
 * †Aphidopsis margarum – type locality for species
 * Aphodius
 * †Aphodius aboriginalis – type locality for species
 * †Aphodius florissantensis – type locality for species
 * †Aphodius granarioides – type locality for species
 * †Aphodius inundatus – type locality for species
 * †Aphodius laminicola – type locality for species
 * †Aphodius mediaevus – type locality for species
 * †Aphodius praeemptor – type locality for species
 * †Aphodius senex – type locality for species
 * †Aphodius shoshonis – type locality for species
 * Aphrophoridae - Aphrophora alni.jpg [[Aphrophora]]
 * Apion
 * †Apion attenuatum
 * †Apion cockerelli – type locality for species
 * †Apion evestigatum – type locality for species
 * †Apocymospermum
 * †Apocynophyllum
 * †Apocynophyllum lesquereuxi
 * †Apolysis
 * †Apolysis magister – type locality for species
 * †Aporema – type locality for genus
 * †Aporema praestrictum – type locality for species
 * †Apsilocephala
 * †Apsilocephala vagabunda – type locality for species
 * †Apternodus
 * †Apternodus iliffensis
 * Aquila
 * Golden Eagle in flight - 5.jpg, or golden eagle]] †Aquila chysaetos''
 * †Araneaovoius
 * †Araneaovoius columbiae
 * Araneus
 * †Araneus absconditus – type locality for species
 * †Araneus cinefactus – type locality for species
 * †Araneus delitus – type locality for species
 * †Araneus emertoni – type locality for species
 * †Araneus kinchloeae – type locality for species
 * †Araneus longimanus – type locality for species
 * †Araneus meeki – type locality for species
 * †Araneus vulcanalis – type locality for species
 * †Archaeochrysa
 * †Archaeochrysa creedei – type locality for species
 * †Archaeochrysa fracta – type locality for species
 * †Archaeochrysa paranervis – type locality for species
 * †Archaeomnium
 * †Archaeomnium brownii
 * Archaeotherium.jpg †[[Archaeotherium]]
 * †Archaeotherium mortoni
 * †Archalia – type locality for genus
 * †Archalia femorata – type locality for species
 * †Archimyrmex – type locality for genus
 * †Archimyrmex rostratus – type locality for species
 * †Archiponera – type locality for genus
 * †Archiponera wheeleri – type locality for species
 * †Archiraphidia
 * †Archiraphidia somnolenta – type locality for species
 * †Archiraphidia tranquilla – type locality for species
 * †Archiraphidia tumulata – type locality for species
 * Arctobyrrhus
 * †Arctobyrrhus subcanus
 * Arctocyon DB.jpg †[[Arctocyon]]
 * †Arctocyon mumak
 * †Arctodontomys
 * †Arctodontomys nuptus
 * †Arctodontomys wilsoni
 * †Arctostylops – tentative report
 * †Arfia
 * †Arfia opisthotoma
 * †Arfia shoshoniensis
 * †Argia
 * †Argia aliena – type locality for species
 * †Arhopalus
 * †Arhopalus pavitus – type locality for species
 * Aristolochia labiata.jpg †[[Aristolochia]]
 * †Aristolochia mortua
 * †Artimonius
 * †Artimonius australis
 * †Artimonius nocerai
 * †Artocarpus
 * †Artocarpus lessigiana
 * †Asilus
 * †Asilus amelanchieris – type locality for species
 * †Asilus curculionis – type locality for species
 * †Asilus florissantinus – type locality for species
 * †Asilus peritulus – type locality for species
 * †Asilus wickhami – type locality for species
 * Asimina triloba3.jpg †[[Asimina]]
 * †Asimina vesperalis
 * Asio
 * †Aspicolpus
 * †Aspicolpus repertus – type locality for species
 * †Asplenium
 * †Asplenium delicatula – or unidentified comparable form
 * †Astephus
 * †Aster
 * †Aster florissantia
 * †Asterocarpinus
 * †Asterocarpinus perplexans
 * Astronium balansae.jpg †[[Astronium]]
 * †Astronium calyx
 * †Astronium truncatum
 * Asynarchus
 * Ataenius
 * †Ataenius patescens – type locality for species
 * †Ataenius restructus – type locality for species
 * †Atalantycha
 * †Atalantycha humata – type locality for species
 * †Athalia
 * †Athalia wheeleri – type locality for species
 * Atheta
 * †Atheta florissantensis – type locality for species
 * Elateridae - Athous sp..JPG †[[Athous]]
 * †Athous contusus – type locality for species
 * †Athous fractus – type locality for species
 * †Athous lethalis – type locality for species
 * †Athyana
 * †Athyana haydenii
 * †Atocus – type locality for genus
 * †Atocus cockerelli – type locality for species
 * †Atocus defessus – type locality for species
 * †Atrichops
 * †Atrichops hesperius – type locality for species
 * †Attagenus
 * †Attagenus aboriginalis – type locality for species
 * †Attagenus sopitus – type locality for species
 * †Aulacidea
 * †Aulacidea ampliforma – type locality for species
 * †Aulacidea progenetrix – type locality for species
 * †Aulacus
 * †Aulacus bradleyi – type locality for species
 * †Aulobaris
 * †Aulobaris anicilla – type locality for species
 * †Aulobaris circumscripta
 * †Aulobaris damnata – type locality for species
 * †Auraria – type locality for genus
 * †Auraria urbana – type locality for species
 * †Averrhoites
 * †Averrhoites affinis
 * †Axestemys – type locality for genus
 * †Axestemys puercensis – or unidentified comparable form
 * †Axestemys quinni – type locality for species
 * Aythya
 * †Aythya affinis
 * †Aythya americana
 * Aztlanolagus.gif †[[Aztlanolagus]]

B

 * †Baena
 * †Baena arenosa
 * †Baioconodon
 * †Baioconodon denverensis – type locality for species
 * †Baioconodon nordicus
 * †Baltemys
 * †Baltemys velogastros – type locality for species
 * †Baptemys
 * †Baptemys wyomingensis
 * †Barbouromeryx
 * †Baris
 * †Baris antediluviana – type locality for species
 * †Baris cremastorhynchoides – type locality for species
 * †Baris divisa – type locality for species
 * †Baris florissantensis – type locality for species
 * †Baris harlani – type locality for species
 * †Baris hoveyi – type locality for species
 * †Baris imperfecta – type locality for species
 * †Baris matura – type locality for species
 * †Baris nearctica – type locality for species
 * †Baris primalis – type locality for species
 * †Baris renovata – type locality for species
 * †Baris schucherti – type locality for species
 * Barylambda faberi skeleton.jpg   †[[Barylambda]]
 * †Barylambda faberi – type locality for species
 * †Barylypa
 * †Barylypa primigena – type locality for species
 * †Bassus
 * †Bassus juvenilis – type locality for species
 * †Bassus miocenicus – type locality for species
 * †Bassus velatus – type locality for species
 * †Bathornis – type locality for genus
 * †Bathornis veredus – type locality for species
 * †Bathygenys
 * †Bathygenys alpha
 * Bathyopsis.jpg †[[Bathyopsis]]
 * †Bathyopsis fissidens
 * †Belyta
 * †Belyta mortuella – type locality for species
 * Bembidion
 * †Bembidion bimaculatum
 * †Bembidion breve
 * †Bembidion coloradense
 * †Bembidion constricticolle
 * †Bembidium
 * †Bembidium florissantensis – type locality for species
 * †Bembidium obductum – type locality for species
 * †Bembidium tumulorum – type locality for species
 * †Beringiaphyllum
 * †Beringiaphyllum cupanioides
 * †Beris
 * †Beris miocenica – type locality for species
 * Betula pendula 001.jpg [[Betula]]
 * †Betula stevensoni
 * Bibio
 * †Bibio capnodes – type locality for species
 * †Bibio cockerelli – type locality for species
 * †Bibio excurvatus – type locality for species
 * †Bibio explanatus – type locality for species
 * †Bibio jamesi – type locality for species
 * †Bibio podager – type locality for species
 * †Bibio vetus – type locality for species
 * †Bibio vulcanius – type locality for species
 * †Bibio wickhami – type locality for species
 * †Bibiodes
 * †Bibiodes intermedia – type locality for species
 * †Bidessus
 * †Bidessus laminarum – type locality for species
 * Bison
 * †Bison antiquus – or unidentified comparable form
 * Bison latifrons fossil buffalo.jpg †[[Bison latifrons]]
 * †Blapstinus
 * †Blapstinus linellii – type locality for species
 * †Blechnum
 * †Blechnum anceps
 * Bledius
 * †Bledius osborni
 * †Bledius primitiarum – type locality for species
 * †Bledius soli – type locality for species
 * †Bledius suturalis
 * †Blickomylus
 * †Blickomylus galushai
 * Boletina
 * †Boletina hypogaea – type locality for species
 * Borealosuchus wilsoni 1.jpg †[[Borealosuchus]]
 * †Borophagus
 * †Borophagus pugnator
 * †Bouromeryx
 * †Bouromeryx americanus – type locality for species
 * †Brachinus
 * †Brachinus newberryi – type locality for species
 * †Brachinus repressus – type locality for species
 * Brachycrus.jpg †[[Brachycrus]]
 * †Brachyerix
 * †Brachyerix macrotis
 * Brachylagus
 * †Brachylagus coloradoensis – type locality for species
 * †Brachyprotoma
 * †Brachyprotoma obtusata
 * †Brachypsalis
 * †Brachypsalis modicus
 * †Brachyrhynchocyon
 * †Brachyspathus – type locality for genus
 * †Brachyspathus curiosus – type locality for species
 * †Brachytarsus – tentative report
 * †Brachytarsus dubius – type locality for species
 * Bracon
 * †Bracon abstractus – type locality for species
 * †Bracon cockerelli – type locality for species
 * †Bracon resurrectus – type locality for species
 * Bruchus brachialis usda.jpg †[[Bruchus]]
 * †Bruchus aboriginalis – type locality for species
 * †Bruchus anilis – type locality for species
 * †Bruchus antaeus – type locality for species
 * †Bruchus bowditchi – type locality for species
 * †Bruchus carpophiloides – type locality for species
 * †Bruchus dormescens – type locality for species
 * †Bruchus exhumatus – type locality for species
 * †Bruchus henshawi – type locality for species
 * †Bruchus osborni – type locality for species
 * †Bruchus succintus – type locality for species
 * †Bruesisca
 * †Bruesisca submersus – type locality for species
 * Bubo
 * Bubo virginianus 06.jpg †[[Bubo virginianus]]
 * Bufo
 * †Bufo cognatus
 * †Bufo douglassi
 * †Bufo woodhousei
 * †Bunophorus
 * †Bunophorus grangeri
 * †Bunophorus pattersoni
 * †Bunophorus robustus
 * †Bunophorus sinclairi
 * †Buprestis
 * †Buprestis florissantensis – type locality for species
 * †Buprestis megistarche – type locality for species
 * †Buprestis scudderi – type locality for species
 * †Bursera
 * †Bursera serrulata
 * Buteo buteo -Netherlands-8.jpg [[Buteo]]
 * †Buteo fluviaticus – type locality for species
 * Byrrhus
 * †Byrrhus eximius
 * †Byrrhus romingeri
 * †Bythoscopus
 * †Bythoscopus lapidescens – type locality for species

C

 * †Cacalydus – type locality for genus
 * †Cacalydus exstirpatus – type locality for species
 * †Cacalydus lapsus – type locality for species
 * †Cacogaster – type locality for genus
 * †Cacogaster novamaculatus – type locality for species
 * †Cacoschistus – type locality for genus
 * †Cacoschistus maceriatus – type locality for species
 * †Caenocholax
 * †Caenocholax barkleyi – type locality for species
 * †Caenocholax palusaxus – type locality for species
 * Starr 061111-1568 Caesalpinia pulcherrima.jpg †[[Caesalpinia]]
 * †Caesalpinia pecorae
 * †Caesalpinites
 * †Caesalpinites acuminatus
 * †Caesalpinites coloradicus
 * †Calamagras – type locality for genus
 * †Calamagras angulatus – type locality for species
 * †Calamagras murivorus – type locality for species
 * †Calamagras talpivorus – type locality for species
 * †Calandrites
 * †Calandrites cineratius
 * †Calandrites defessus
 * †Calandrites hindsi – type locality for species
 * †Calandrites ursorum – type locality for species
 * †Calcarius
 * Lapland Longspur - Calcarius lapponicus - Sportittlingur 1.jpg †[[Calcarius lapponicus]]
 * †Calcarius ornatus
 * †Calippus
 * †Calippus regulus
 * †Caliroa
 * †Caliroa micrarche – type locality for species
 * †Caliroa mimus – type locality for species
 * †Caliroa revelata – type locality for species
 * †Callidiopsites – type locality for genus
 * †Callidiopsites grandiceps – type locality for species
 * †Callimoxys
 * †Callimoxys primordialis – type locality for species
 * †Callomyia – tentative report
 * †Callomyia hypolitha – type locality for species
 * Calosoma
 * †Calosoma calvini – type locality for species
 * †Calosoma cockerelli – type locality for species
 * †Calosoma emmonsi – type locality for species
 * †Calyptapis – type locality for genus
 * †Calyptapis florissantensis – type locality for species
 * Camelops hesternus Sergiodlarosa.jpg †[[Camelops]]
 * †Camelops hesternus
 * †Camerotops
 * †Camerotops solidatus – type locality for species
 * Camponotus
 * †Camponotus fuscipennis – type locality for species
 * †Camponotus microcephalus – type locality for species
 * †Camponotus petrifactus – type locality for species
 * Canis
 * †Canis edwardii – or unidentified comparable form
 * †Canis latrans
 * †Cantius
 * †Cantius abditus
 * †Cantius frugivorus
 * †Cantius mckennai
 * †Cantius ralstoni
 * †Capnobotes
 * †Capnobotes silens
 * †Capnochroa
 * †Capnochroa senilis – type locality for species
 * †Capsus
 * †Capsus lacus – type locality for species
 * †Capsus obsolefactus – type locality for species
 * †Carabites – tentative report
 * †Carabites arapahoensis – type locality for species
 * Carabus
 * †Carabus jeffersoni – type locality for species
 * †Cardichelyon
 * †Cardichelyon rogerwoodi – or unidentified comparable form
 * †Cardiolophus
 * †Cardiolophus radinskyi
 * Cardiophorus gramineus up.JPG †[[Cardiophorus]]
 * †Cardiophorus cockerelli – type locality for species
 * †Cardiophorus deprivatus – type locality for species
 * †Cardiophorus exhumatus – type locality for species
 * †Cardiophorus florissantensis – type locality for species
 * †Cardiophorus lithographicus – type locality for species
 * †Cardiophorus requiescens – type locality for species
 * Cardiospermum
 * [[file:Cardiospermum coloradensis (fossil leaf) (Green River Formation, Eocene; Utah, USA) (44557178634).jpg|thumb|right|upright|A Cardiospermum coloradensis leaf]]†[[Cardiospermum coloradensis]]
 * †Cardiospermum terminalis
 * †Cariblattoides
 * †Cariblattoides labandeirai – type locality for species
 * †Carmelus
 * †Carmelus gravatus – type locality for species
 * †Carmelus sepositus – type locality for species
 * †Carpites
 * †Carpites gemmaceus
 * †Carpites miliodes
 * †Carpocyon
 * †Carpocyon compressus
 * †Carpocyon robustus
 * Carpodacus
 * †Carpodacus cassinii
 * †Carpodaptes
 * †Carpodaptes aulacodon – type locality for species
 * †Carpodaptes cygneus
 * †Carpophilus
 * †Carpophilus restructus – type locality for species
 * Carya Morton 29-U-10.jpg [[Carya]]
 * †Carya antiquorum
 * †Carya florissantensis
 * †Carya libbeyi
 * Castanea
 * †Castanea dolichophylla
 * †Castanea intermedia
 * †Catobaris – type locality for genus
 * †Catobaris coenosa – type locality for species
 * †Catopamera – type locality for genus
 * †Catopamera augheyi – type locality for species
 * †Catopamera bradleyi – type locality for species
 * †Catopsalis
 * †Catopsalis alexanderi – type locality for species
 * †Catopsylla – type locality for genus
 * †Catopsylla crawfordi – type locality for species
 * †Catopsylla prima – type locality for species
 * †Cecidomyia – tentative report
 * †Cecidomyia pontaniiformis
 * Cedrela
 * †Cedrela lancifolia
 * †Cedrelospermum
 * †Cedrelospermum lineatum
 * †Cedromus
 * †Cedromus wardi
 * †Celastrilex – type locality for genus
 * †Celastrilex artocarpidioides – type locality for species. Formerly classified as Celastrinites artocarpidioides.
 * †Celastrinites
 * †Celastrilex artocarpidioides – type locality for species. Later reclassified as Celastrilex artocarpidioides.
 * Celastrus scandens.jpg †[[Celastrus]]
 * †Celastrus typica
 * †Celastrus winchesteri
 * Celtis
 * †Celtis mccoshii
 * †Centetodon
 * †Centetodon magnus
 * †Centetodon marginalis
 * †Centetodon patratus – type locality for species
 * †Centimanomys
 * †Centimanomys galbreathi
 * †Centimanomys major
 * †Centrinus
 * †Centrinus hypogaeus – type locality for species
 * †Centrinus obnuptus – type locality for species
 * †Centrinus vulcanicus – type locality for species
 * †Centrocerus
 * †Centrocerus urophasianus
 * †Centron – type locality for genus
 * †Centron moricollis – type locality for species
 * †Cephalomyrmex – type locality for genus
 * †Cephalomyrmex rotundatus – type locality for species
 * †Ceratina
 * †Ceratina disrupta – type locality for species
 * Ceratosuchus burdoshi e.jpg †[[Ceratosuchus]] – type locality for genus
 * †Ceratosuchus burdoshi – type locality for species
 * †Ceraturgus
 * †Ceraturgus praecursor – type locality for species
 * Cercidiphyllum
 * †Cercidiphyllum arcticum
 * Cercis
 * †Cercis parvifolia
 * †Cercocarpus
 * †Cercocarpus myricaefolius
 * †Cercopis
 * †Cercopis cephalinus – type locality for species
 * †Cercopis suffocata – type locality for species
 * †Ceropalites – type locality for genus
 * †Ceropalites infelix – type locality for species
 * †Ceruchus
 * †Ceruchus fuchsii – type locality for species
 * Cervus
 * Cervus elaphus Luc Viatour 6.jpg †[[Cervus elaphus]]
 * Ceutorhynchus
 * †Ceutorhynchus blaisdelli – type locality for species
 * †Ceutorhynchus clausus – type locality for species
 * †Ceutorhynchus compactus – type locality for species
 * †Ceutorhynchus degravatus – type locality for species
 * †Ceutorhynchus duratus – type locality for species
 * †Ceutorhynchus irvingi – type locality for species
 * Chaetodipus
 * †Chaetodipus hispidus
 * †Chaetopleurophora
 * †Chaetopleurophora laminarum – type locality for species
 * †Chaetoptelea
 * †Chaetoptelea microphylla
 * †Chalcis
 * †Chalcis perdita – type locality for species
 * †Chalcis praevalens
 * †Chalcis praevolans – type locality for species
 * †Chalcis tortilis – type locality for species
 * †Chalepus
 * †Chalepus americanus – type locality for species
 * †Chalybion
 * †Chalybion mortuum – type locality for species
 * †Chamaecyparis
 * †Chamaecyparis linguaefolia
 * Chamaedorea costaricana.jpg †[[Chamaedorea]]
 * †Chamaedorea danae
 * †Chaneya
 * The American Museum journal (c1900-(1918)) (17975178659) Chaneya tenuis.jpg†[[Chaneya tenuis]]
 * Charina
 * †Charina prebottae
 * †Chauliognathus
 * †Chauliognathus pristinus – type locality for species
 * †Cheilophis – type locality for genus
 * †Cheilophis huerfanoensis – type locality for species
 * Cheilosia
 * †Cheilosia hecate – type locality for species
 * †Cheilosia miocenica – type locality for species
 * †Cheilosia scudderi – type locality for species
 * †Cheilosia sepultula – type locality for species
 * †Chelonarium
 * †Chelonarium montanum – type locality for species
 * †Chelonus
 * †Chelonus depressus – type locality for species
 * †Chelonus muratus – type locality for species
 * †Chelonus solidus – type locality for species
 * †Chilocorus
 * †Chilocorus ulkei – type locality for species
 * †Chionaemopsis – type locality for genus
 * †Chionaemopsis quadrifasciatus – type locality for species
 * †Chiromyoides
 * †Chiromyoides caesor
 * †Chiromyoides gigas
 * †Chiromyoides potior – type locality for species
 * Chironomus plumosus01.jpg [[Chironomus]]
 * †Chironomus almelanderi – type locality for species
 * †Chironomus depletus – type locality for species
 * †Chironomus patens – type locality for species
 * †Chironomus pausatus – type locality for species
 * †Chironomus primaevus – type locality for species
 * †Chironomus pristinus – type locality for species
 * †Chironomus proterus – type locality for species
 * †Chironomus requiescens – type locality for species
 * †Chironomus scudderiellus – type locality for species
 * Chondestes
 * †Chondestes grammacus
 * †Chriacus
 * †Chriacus gallinae
 * †Chrysis
 * †Chrysis miocenica – type locality for species
 * †Chrysis rohweri – type locality for species
 * †Chrysobothris
 * †Chrysobothris coloradensis – type locality for species
 * †Chrysobothris gahani – type locality for species
 * †Chrysobothris haydeni – type locality for species
 * †Chrysobothris suppressa – type locality for species
 * †Chrysogaster
 * †Chrysogaster antiquarius – type locality for species
 * Chrysomela
 * †Chrysomela vesperalis – type locality for species
 * †Cicada
 * †Cicada grandiosa – type locality for species
 * †Cicadella
 * †Cicadella scudderi – type locality for species
 * †Cimbex
 * †Cimbex vetusculus – type locality for species
 * †Cimexomys
 * †Cimexomys arapahoensis – type locality for species
 * †Cimexomys minor
 * Starr 010419 0038 cinnamomum camphora.jpg [[Cinnamomum]]
 * †Cinnamomum sezannense
 * †Cissites
 * †Cissites rocklandensis
 * Cissus
 * †Cissus marginata
 * †Cixius – tentative report
 * †Cixius proavus – type locality for species
 * †Cladius
 * †Cladius petrinus – type locality for species
 * †Cladoneura – type locality for genus
 * †Cladoneura willistoni – type locality for species
 * †Cladura
 * †Cladura integra – type locality for species
 * †Cladura maculata – type locality for species
 * †Clastoptera
 * †Clastoptera comstocki – type locality for species
 * Cleonis pigra Mikulov.jpg †[[Cleonus]]
 * †Cleonus degeneratus – type locality for species
 * †Cleonus estriatus – type locality for species
 * †Cleonus exterraneus – type locality for species
 * †Cleonus foersteri – type locality for species
 * †Cleonus primoris – type locality for species
 * †Cleonus rohweri – type locality for species
 * †Closterocoris
 * †Closterocoris elegans – type locality for species
 * †Clubiona
 * †Clubiona arcana
 * †Clubiona curvispinosa – type locality for species
 * †Clubiona eversa – type locality for species
 * †Clubiona florissanti – type locality for species
 * †Clytus
 * †Clytus pervetustus – type locality for species
 * Coccinella transversalis 2.jpg †[[Coccinella]]
 * †Coccinella florissantensis – type locality for species
 * †Coccinella sodoma – type locality for species
 * †Coccotorus
 * †Coccotorus principalis – type locality for species
 * †Coccotorus requiescens – type locality for species
 * †Coeliodes
 * †Coeliodes primotinus – type locality for species
 * Colaptes
 * †Colaptes auratus
 * †Colaspis
 * †Colaspis aetatis – type locality for species
 * †Colaspis diluvialis – type locality for species
 * †Colaspis proserpina – type locality for species
 * †Colastes
 * †Colastes abrogatus – type locality for species
 * †Colemanus – type locality for genus
 * †Colemanus keeleyorum – type locality for species
 * †Collops
 * †Collops desuetus – type locality for species
 * †Collops extrusus – type locality for species
 * †Collops priscus – type locality for species
 * †Colopterus
 * †Colopterus pygidialis – type locality for species
 * †Colpoclaenus
 * †Colpoclaenus keeferi
 * Starr 061222-2598 Colubrina asiatica.jpg †[[Colubrina]]
 * †Colubrina spireaefolia
 * †Colubrina spireafollia
 * †Compsemys
 * †Compsemys victa
 * †Comptosia – type locality for genus
 * †Comptosia miranda – type locality for species
 * †Conacodon
 * †Conacodon delphae – type locality for species
 * †Conacodon harbourae – type locality for species
 * †Conacodon matthewi – type locality for species
 * †Coniatus
 * †Coniatus refractus
 * Conotelus
 * †Conotelus obscurus
 * Plum Curculio adult.jpg †[[Conotrachelus]]
 * †Conotrachelus florissantensis – type locality for species
 * †Contogenys – or unidentified related form
 * †Convolvulites
 * †Convolvulites orichitus
 * †Conzattia
 * †Conzattia coriacea – type locality for species
 * †Copecion
 * †Copecion brachypternus
 * †Copelemur
 * †Copelemur praetutus
 * †Cophocoris – type locality for genus
 * †Cophocoris tenebricosus – type locality for species
 * †Cophura
 * †Cophura antiquella – type locality for species
 * †Copidita
 * †Copidita miocenica – type locality for species
 * †Coptochromus – type locality for genus
 * †Coptochromus manium – type locality for species
 * †Cordilura
 * †Cordilura exhumata – type locality for species
 * †Corethra
 * †Corethra exita – type locality for species
 * Corixa
 * †Corixa immersa – type locality for species
 * †Corixa vanduzeei – type locality for species
 * †Corizus
 * †Corizus abditivus – type locality for species
 * †Corizus celatus – type locality for species
 * †Corizus somnurnus – type locality for species
 * †Cormocyon
 * †Cormocyon copei
 * Ashfall Fossil Beds - Teleoceras and Cormohipparion.jpg †[[Cormohipparion]]
 * †Cormohipparion quinni
 * †Cormohipparion sphenodus
 * Cornus
 * †Cornus hyperborea
 * †Corphyra
 * †Corphyra calypso – type locality for species
 * Corticaria
 * †Corticaria aeterna – type locality for species
 * †Corticaria egregia – type locality for species
 * †Corticaria occlusa – type locality for species
 * †Corticaria petrefacta – type locality for species
 * Corvus
 * †Corvus brachyrhynchos
 * †Corvus corax
 * †Corylus
 * †Corylus insignis
 * Coryphodon.jpg †[[Coryphodon]]
 * †Coryphodon armatus
 * †Coryphodon eocaenus
 * Cossonus
 * †Cossonus gabbii – type locality for species
 * †Cossonus rutus – type locality for species
 * †Cotinus
 * †Cotinus fraterna
 * †Crabro
 * †Crabro longaevus – type locality for species
 * †Cratacanthus
 * †Cratacanthus florissantensis – type locality for species
 * Crataegus, various species, fruit.jpg [[Crataegus]]
 * †Crataegus copeana
 * †Crataegus hendersoni
 * †Crataegus nupta
 * †Cremastorhynchus
 * †Cremastorhynchus stabilis
 * †Cremastosaurus – type locality for genus
 * †Cremastosaurus carinicollis – type locality for species
 * †Cremastosaurus rhambastes – type locality for species
 * †Cremnops
 * †Cremnops florissanticola – type locality for species
 * †Creniphilites – type locality for genus
 * †Creniphilites orpheus – type locality for species
 * †Crioceridea – type locality for genus
 * †Crioceridea dubia – type locality for species
 * Crotalus
 * Crotalus viridis nuntius.jpg †[[Crotalus viridis]]
 * †Croton
 * †Croton furculatum
 * †Cryptagriotes – type locality for genus
 * †Cryptagriotes minusculus – type locality for species
 * †Cryptocephalus
 * †Cryptocephalus miocenus – type locality for species
 * †Cryptocheilus
 * †Cryptocheilus florissantensis – type locality for species
 * †Cryptocheilus hypogaeus – type locality for species
 * †Cryptocheilus laminarum – type locality for species
 * †Cryptocheilus scudderi – type locality for species
 * †Cryptocheilus senex – type locality for species
 * †Cryptochromus – type locality for genus
 * †Cryptochromus letatus – type locality for species
 * Cryptohypnus
 * †Cryptohypnus exterminatus – type locality for species
 * †Cryptohypnus hesperus – type locality for species
 * Cryptophagus cellaris.jpg [[Cryptophagus]]
 * †Cryptophagus bassleri – type locality for species
 * †Cryptophagus petricola – type locality for species
 * †Cryptophagus scudderi – type locality for species
 * Cryptorhynchus
 * †Cryptorhynchus annosus
 * †Cryptorhynchus coloradensis – type locality for species
 * †Cryptorhynchus durus – type locality for species
 * †Cryptorhynchus evinctus – type locality for species
 * †Cryptorhynchus fallii – type locality for species
 * †Cryptorhynchus kerri – type locality for species
 * †Cryptorhynchus profusus – type locality for species
 * †Cryptus
 * †Cryptus delineatus – type locality for species
 * †Ctereacoris – type locality for genus
 * †Ctereacoris primigenus – type locality for species
 * CPipFm.jpg [[Culex]]
 * †Culex winchesteri – type locality for species
 * †Curculio
 * †Curculio anicularis – type locality for species
 * †Curculio beeklyi – type locality for species
 * †Curculio curvirostris – type locality for species
 * †Curculio duttoni – type locality for species
 * †Curculio extinctus – type locality for species
 * †Curculio femoratus
 * †Curculio flexirostris – type locality for species
 * †Curculio florissantensis – type locality for species
 * †Curculio minusculoides – type locality for species
 * †Curculio minusculus
 * †Curculio restrictus – type locality for species
 * †Cursoricoccyx – type locality for genus
 * †Cursoricoccyx geraldinae – type locality for species
 * †Cuterebra
 * †Cuterebra ascarides – type locality for species
 * †Cuterebra bibosa – type locality for species
 * †Cychramites – type locality for genus
 * †Cychramites hirtus – type locality for species
 * †Cyclotrachelus
 * †Cyclotrachelus tenebricus – type locality for species
 * †Cydamus
 * †Cydamus robustus – type locality for species
 * †Cydnopsis
 * †Cydnopsis handlirschi – type locality for species
 * †Cylindrodon
 * †Cylindrodon nebraskensis
 * †Cylindrotoma
 * †Cylindrotoma veterana – type locality for species
 * †Cynarctoides
 * †Cynarctoides acridens
 * Cynelos lemanensis.JPG †[[Cynelos]]
 * Cynomys
 * †Cynomys niobrarius
 * †Cynomys spenceri – or unidentified comparable form
 * †Cyperacites
 * †Cyperacites lacustris – type locality for species
 * †Cyphomyia
 * †Cyphomyia rohweri – type locality for species
 * Cyphon
 * †Cyphus
 * †Cyphus florissantensis – type locality for species
 * †Cypris
 * †Cypris florissantensis – type locality for species
 * †Cyrtapis – type locality for genus
 * †Cyrtapis anomala – type locality for species
 * †Cyrtomon
 * †Cyrtomon subterraneus – type locality for species
 * Cytilus
 * †Cytilus tartarinus – type locality for species
 * †Cyttaromyia
 * †Cyttaromyia obdurescens – type locality for species
 * †Cyttaromyia princetoniana – type locality for species
 * †Cyttaromyia reclusa – type locality for species

D

 * †Daphne
 * †Daphne septentrionalis
 * Daphnia
 * Daphoenus vetus restoration.jpg †[[Daphoenus]]
 * †Daphoenus vetus
 * †Dartonius
 * †Dartonius jepseni
 * †Dascillus
 * †Dascillus lithographicus – type locality for species
 * †Davidia
 * †Davidia antiqua
 * †Deleaster
 * †Deleaster grandiceps – type locality for species
 * †Delphax
 * †Delphax senilis – type locality for species
 * †Delphax veterum – type locality for species
 * †Demophorus
 * †Demophorus antiquus – type locality for species
 * †Denaeaspis – type locality for genus
 * †Denaeaspis chelonopsis – type locality for species
 * †Dendragopus
 * †Dendragopus obscurus
 * Dennstaedtia punctilobula1.jpg †[[Dennstaedtia]]
 * †Dennstaedtia americana
 * †Denverus – type locality for genus
 * †Denverus middletoni – type locality for species
 * †Dermatobia
 * †Dermatobia hydropica – type locality for species
 * †Dermestes
 * †Dermestes tertiarius – type locality for species
 * †Derobrochus – type locality for genus
 * †Derobrochus abstractus – type locality for species
 * †Derobrochus caenulentus – type locality for species
 * †Derobrochus commoratus – type locality for species
 * †Derobrochus craterae – type locality for species
 * †Derobrochus frigescens – type locality for species
 * †Derobrochus marcidus – type locality for species
 * †Derobrochus typharum – type locality for species
 * †Desmatoclaenus
 * †Desmatoclaenus protogonioides – or unidentified comparable form
 * †Desmatomyia – type locality for genus
 * †Desmatomyia scopulicornis – type locality for species
 * †Detyopsis – type locality for genus
 * †Detyopsis packardi – type locality for species
 * †Detyopsis scudderi – type locality for species
 * †Deviacer
 * †Diabrotica
 * †Diabrotica bowditchiana – type locality for species
 * †Diabrotica exesa – type locality for species
 * †Diabrotica florissantella – type locality for species
 * †Diabrotica uteana – type locality for species
 * Diacodexis pakistanensis e.jpg †[[Diacodexis]]
 * †Diacodexis kelleyi
 * †Diacodexis metsiacus – or unidentified comparable form
 * †Diacodexis minutus
 * †Diacodexis primus
 * †Diacodexis secans – or unidentified comparable form
 * †Diacodon
 * †Diacodon alticuspis – or unidentified comparable form
 * †Dialysis
 * †Dialysis revelata – type locality for species
 * Dialytes
 * Dialytodius
 * †Dialytodius decipiens
 * Diamesa
 * †Diamesa extincta – type locality for species
 * †Dianthidium
 * †Dianthidium tertiarium – type locality for species
 * †Diaplegma – type locality for genus
 * †Diaplegma abductum – type locality for species
 * †Diaplegma haldemani – type locality for species
 * †Diaplegma occultorum – type locality for species
 * †Diaplegma ruinosum – type locality for species
 * †Diaplegma venerabile – type locality for species
 * †Diaplegma veterascens – type locality for species
 * Subhyracodon tridactylus.jpg Diceratherium. Robert Bruce Horsfall (1913).]] †Diceratherium
 * †Diceratherium tridactylum
 * †Dicerca
 * †Dicerca eurydice – type locality for species
 * Dicranomyia
 * †Dicranomyia faecarius – type locality for species
 * †Dicranomyia fontainei – type locality for species
 * †Dicranomyia fragilis – type locality for species
 * †Dicranomyia inferna – type locality for species
 * †Dicranomyia loewi – type locality for species
 * †Dicranomyia longipes – type locality for species
 * †Dicranomyia primitiva
 * †Dicranomyia rohweri – type locality for species
 * †Dicranomyia saxetana – type locality for species
 * †Dicranomyia stagnorum
 * †Dicranomyia stigmosa
 * Dicranota.claripennis.-.lindsey.jpg †[[Dicranota]]
 * †Dicranota cockerelli – type locality for species
 * †Dictyla
 * †Dictyla veterana – type locality for species
 * †Dictyophara
 * †Dictyophara bouvei – type locality for species
 * †Dictyoraphidia
 * †Dictyoraphidia veterana – type locality for species
 * †Didelphodus
 * †Didelphodus absarokae
 * †Didelphodus altidens
 * †Didymictis
 * †Didymictis altidens
 * †Didymictis leptomylus
 * †Didymictis protenus
 * †Didymictis proteus – or unidentified comparable form
 * †Didymictis vancleveae
 * †Didymosphaeria
 * †Didymosphaeria betheli
 * †Dikkomys
 * †Dilaropsis – type locality for genus
 * †Dilaropsis ornatus – type locality for species
 * †Dillenites
 * †Dillenites garfieldensis
 * †Dilophodon
 * †Dineura
 * †Dineura cockerelli – type locality for species
 * †Dineura fuscipennis – type locality for species
 * †Dineura laminarum – type locality for species
 * †Dineura microsoma – type locality for species
 * †Dineura saxorum – type locality for species
 * ExtmDinictis1921-029-11.jpg †[[Dinictis]]
 * †Dinidorites – type locality for genus
 * †Dinidorites margiformis – type locality for species
 * †Dinoderus
 * †Dinoderus cuneicollis – type locality for species
 * †Dinohippus
 * †Dinohippus interpolatus – or unidentified comparable form
 * †Dioctria
 * †Dioctria florissantina – type locality for species
 * †Dioctria pulveris – type locality for species
 * Dioscorea
 * †Diplodipelta – type locality for genus
 * †Diplodipelta reniptera
 * †Diplolophus
 * †Diplolophus insolens
 * †Diploptera
 * †Diploptera gemini – type locality for species
 * †Diploptera savba – type locality for species
 * †Diploptera vladimir – type locality for species
 * Diplotaxis – tentative report
 * Diplotaxis
 * †Diplotaxis aurora – type locality for species
 * †Diplotaxis simplicipes – type locality for species
 * Dipodomys
 * Ord's kangaroo rat.jpg †[[Dipodomys ordii]]
 * †Dipsalidictis
 * †Dipsalidictis transiens
 * Dipteronia
 * †Dipteronia brownii
 * †Dipteronia insignis
 * †Dissacus
 * †Dissacus navajovius
 * †Docimus – type locality for genus
 * †Docimus psylloides – type locality for species
 * †Docirhynchus
 * †Docirhynchus terebrans – type locality for species
 * Dodonaea
 * †Dodonaea umbrina
 * Dolichoderus mariae casent0003312 dorsal 1.jpg [[Dolichoderus]]
 * †Dolichoderus antiquus – type locality for species
 * †Dolichoderus kohlsi – type locality for species
 * †Dolichoderus rohweri – type locality for species
 * †Dolichomyia
 * †Dolichomyia tertiaria – type locality for species
 * †Dolichomyia testea – type locality for species
 * Dolurgus
 * †Dolurgus pumilus
 * †Dombeyopsis
 * †Dombeyopsis magnifica
 * †Dominickus – type locality for genus
 * †Dominickus castnioides – type locality for species
 * †Domnina
 * †Domnina gradata
 * †Domnina thompsoni – or unidentified comparable form
 * †Domninoides
 * Donacia
 * Dorytomus
 * †Dorytomus coercitus – type locality for species
 * †Dorytomus williamsi – type locality for species
 * †Doxocopa
 * †Doxocopa wilmattae – type locality for species
 * †Drassonax
 * †Drassonax harpagops – type locality for species
 * †Drepanomeryx – tentative report
 * †Drepanomeryx falciformis
 * Dromomeryx borealis.jpeg †[[Dromomeryx]]
 * †Dromomeryx borealis – type locality for species
 * †Dryobius
 * †Dryobius miocenicus – type locality for species
 * Dryocoetes – type locality for genus
 * †Dryocoetes diluvialis – type locality for species
 * Dryopteris
 * †Dryopteris guyottii
 * †Dryopteris lakesi
 * †Dryopteris serrata
 * Dyschirius
 * †Dyscoletes
 * †Dyscoletes soporatus – type locality for species
 * †Dysdercus
 * †Dysdercus cinctus – type locality for species
 * †Dysdercus unicolor – type locality for species
 * †Dyspetochrysa
 * †Dyspetochrysa vetuscula – type locality for species

E

 * †Earinus
 * †Earinus saxatilis – type locality for species
 * †Ecclesimus
 * †Ecclesimus tenuiceps
 * †Echinaphis – type locality for genus
 * †Echinaphis rohweri – type locality for species
 * Echmatemys stevensoniana AMNH 6084.jpg †[[Echmatemys]]
 * †Echmatemys lativertebralis – or unidentified comparable form
 * †Echmatemys septaria
 * †Echmatemys stevensoniana – tentative report
 * †Ectobius
 * †Ectobius kohlsi – type locality for species
 * †Ectocion
 * †Ectocion major
 * †Ectocion medituber
 * †Ectocion osbornianus
 * †Ectocion parvus
 * †Ectoconus
 * †Ectoconus ditrigonus
 * †Ectoganus
 * †Ectoganus lobdelli
 * †Ectopria
 * †Ectopria laticollis – type locality for species
 * †Ectypodus
 * †Ectypodus childei – or unidentified comparable form
 * †Ectypodus musculus – type locality for species
 * †Ectypodus tardus
 * †Elaeomyrmex – type locality for genus
 * †Elaeomyrmex coloradensis – type locality for species
 * †Elaeomyrmex gracilis – type locality for species
 * †Elaphidion
 * †Elaphidion fracticorne – type locality for species
 * Elaphropus
 * †Elaphropus incurvus
 * †Elater
 * †Elater florissantensis – type locality for species
 * †Elater rohweri – type locality for species
 * †Elater scudderi – type locality for species
 * Eleodes
 * †Eleodes granulatus – or unidentified comparable form
 * †Elidiptera
 * †Elidiptera regularis – type locality for species
 * †Emiliana – type locality for genus
 * †Emiliana alexandri – type locality for species
 * Empis livida (aka).jpg †[[Empis]]
 * †Empis florissantana – type locality for species
 * †Empis infossa – type locality for species
 * †Empis miocenica – type locality for species
 * †Empis perdita – type locality for species
 * †Enallagma
 * †Enallagma florissantella – type locality for species
 * †Enallagma mortuella – type locality for species
 * †Enallagma oblisum – type locality for species
 * Engelhardtia
 * †Engelhardtia uintaensis – type locality for species
 * Enochrus
 * †Enochrus hamiltoni
 * †Enochrus scudderi – type locality for species
 * †Entimus
 * †Entimus primordialis – type locality for species
 * Eobasileus cropped.png †[[Eobasileus]]
 * †Eobasileus cornutus
 * †Eobruneria – type locality for genus
 * †Eobruneria tessellata – type locality for species
 * †Eobumbatrix
 * †Eobumbatrix latebrosa – type locality for species
 * †Eocleonus – type locality for genus
 * †Eocleonus subjectus – type locality for species
 * †Eocuculus – type locality for genus
 * †Eocuculus cherpinae – type locality for species
 * †Eodiplurina – type locality for genus
 * †Eodiplurina cockerelli – type locality for species
 * †Eoerianthus – type locality for genus
 * †Eoerianthus eocaenicus – type locality for species
 * †Eoerianthus multispinosa – type locality for species
 * †Eoformica – type locality for genus
 * †Eoformica globularis – type locality for species
 * †Eoformica magna – type locality for species
 * †Eoformica pinguis – type locality for species
 * †Eofulgorella – type locality for genus
 * †Eofulgorella bradburyi – type locality for species
 * †Eoglyptosaurus
 * †Eoglyptosaurus donohoei
 * †Eogryllus
 * †Eogryllus elongatus – type locality for species
 * †Eogryllus unicolor – type locality for species
 * †Eohemichroa
 * †Eohemichroa eophila – type locality for species
 * Hyracotherium Eohippus hharder cropped.png †[[Eohippus]]
 * †Eohippus angustidens
 * †Eolestes – type locality for genus
 * †Eolestes syntheticus – type locality for species
 * †Eoliarus – type locality for genus
 * †Eoliarus quadristictus – type locality for species
 * †Eomerope – type locality for genus
 * †Eomerope tortriciformis – type locality for species
 * †Eomogoplistes – type locality for genus
 * †Eomogoplistes longipennis – type locality for species
 * †Eomyza – type locality for genus
 * †Eomyza holoptera – type locality for species
 * †Eopachylosticta
 * †Eopachylosticta byrami – type locality for species
 * †Eophlebomyia – type locality for genus
 * †Eophlebomyia claripennis – type locality for species
 * †Eopimpla – type locality for genus
 * †Eopimpla grandis – type locality for species
 * †Eosacantha – type locality for genus
 * †Eosacantha delocranioides – type locality for species
 * †Eostentatrix
 * †Eostentatrix cockerelli – type locality for species
 * †Eostentatrix ostentata – type locality for species
 * †Eotetrix – type locality for genus
 * †Eotetrix unicornis – type locality for species
 * †Eothes – type locality for genus
 * †Eothes elegans – type locality for species
 * †Eotingis – type locality for genus
 * †Eotingis antennata – type locality for species
 * Eotitanops borealis.jpg †[[Eotitanops]]
 * †Eotitanops borealis
 * †Eotrella – type locality for genus
 * †Eotrella mira – type locality for species
 * †Eotylopus
 * †Eozacla
 * †Eozacla arachnomorpha – type locality for species
 * †Eozacla problematica – type locality for species
 * †Epallagites – type locality for genus
 * †Epallagites avus – type locality for species
 * †Epanuraea – type locality for genus
 * †Epanuraea ingenita – type locality for species
 * †Ephalus
 * †Ephalus adumbratus – type locality for species
 * Mormon Tea in Arches NP - July 2008.jpg [[Ephedra (plant)|Ephedra]]
 * †Ephedra miocenica
 * †Ephemera
 * †Ephemera exsucca – type locality for species
 * †Ephemera howarthi – type locality for species
 * †Ephemera immobilis – type locality for species
 * †Ephemera interempta – type locality for species
 * †Ephemera macilenta – type locality for species
 * †Ephemera pumicosa – type locality for species
 * †Ephemera tabifica – type locality for species
 * †Epicaerus
 * †Epicaerus effossus
 * †Epicaerus eradicatus
 * †Epicaerus evigoratus
 * †Epicaerus exanimis
 * †Epicaerus excissus – type locality for species
 * †Epicaerus saxatilis
 * †Epicaerus subterraneus
 * †Epicaerus terrosus
 * Epicauta
 * †Epicauta subneglecta – type locality for species
 * Epicyon haydeni skeleton.jpg †[[Epicyon]]
 * †Epicyon haydeni
 * †Epihippus
 * †Epihippus gracilis
 * †Epiphloeus
 * †Epiphloeus pristinus – type locality for species
 * Epuraea
 * †Epuraea planulata
 * †Epyris
 * †Epyris deletus – type locality for species
 * †Equisetum
 * †Equisetum florissantense
 * †Equisetum winchesteri
 * Equus
 * †Equus conversidens
 * †Equus francisci
 * †Equus scotti – or unidentified comparable form
 * Equus simplicidens UMNH.jpg †[[Equus simplicidens]]
 * Eremophila
 * †Eremophila alpestris
 * Erethizon
 * Eriocampa
 * †Eriocampa bruesi – type locality for species
 * †Eriocampa celata – type locality for species
 * †Eriocampa disjecta – type locality for species
 * †Eriocampa pristina – type locality for species
 * †Eriocampa scudderi – type locality for species
 * †Eriocampa synthetica – type locality for species
 * †Eriophyes – tentative report
 * †Eriophyes beutenmulleri
 * †Eristalis
 * †Eristalis lapideus – type locality for species
 * †Ernobius
 * †Ernobius effetus – type locality for species
 * †Erycus
 * †Erycus brevicollis – type locality for species
 * †Esthonyx
 * †Esthonyx acutidens
 * †Esthonyx bisulcatus
 * †Esthonyx spatularius
 * †Eterochalcis
 * †Eterochalcis scudderi – type locality for species
 * Ethmia bipunctella.jpg †[[Ethmia]]
 * †Ethmia mortuella – type locality for species
 * †Etirocoris – type locality for genus
 * †Etirocoris infernalis – type locality for species
 * †Eubazus
 * †Eubazus wilmattae – type locality for species
 * †Eucallimyia
 * †Eucallimyia fortis – type locality for species
 * †Eucicones
 * †Eucicones oblongopunctata – type locality for species
 * Eucnecosum
 * †Eucnecosum brachypterum
 * †Eucnecosum brunnescens
 * †Eucnecosum tenue
 * †Eucnemis
 * †Eucnemis antiquatus – type locality for species
 * Eucommia-ulmoides.JPG †[[Eucommia]]
 * †Eucommia serrata
 * †Eucorites – type locality for genus
 * †Eucorites serescens – type locality for species
 * †Eudasytites – type locality for genus
 * †Eudasytites listriformis – type locality for species
 * †Eudomus
 * †Eudomus pinguis
 * †Eudomus robustus
 * Eugenia
 * †Eugenia americana
 * †Eugenia arenaceaeformis
 * †Eugnamptidea – type locality for genus
 * †Eugnamptidea florissantensis – type locality for species
 * †Eugnamptidea robusta – type locality for species
 * †Eugnamptidea tertiaria – type locality for species
 * †Eulithomyrmex – type locality for genus
 * Eulithomyrmex rugosus UCM17019 whole.jpg]] †Eulithomyrmex rugosus'' – type locality for species
 * †Eulithomyrmex striatus – type locality for species
 * †Eumys
 * †Eumys brachyodus
 * †Eumys elegans
 * †Euparius
 * †Euparius adumbratus – type locality for species
 * †Euparius arcessitus – type locality for species
 * Euphorbia
 * †Euphorbia minuta
 * †Euphorus
 * †Euphorus indurescens – type locality for species
 * †Eurhinus
 * †Eurhinus occultus – type locality for species
 * †Euroxenomys
 * †Eurytoma
 * †Eurytoma sepulta – type locality for species
 * †Eurytoma sequax – type locality for species
 * Eutamias
 * Tamias minimus.jpg (formerly Eutamias minimus), or least chipmunk]] †Eutamias minimus'' – or unidentified comparable form
 * †Eutrichopleurus
 * †Eutrichopleurus miocenus – type locality for species
 * †Eutypomys
 * †Eutypomys parvus
 * †Evopes
 * †Evopes occubatus – type locality for species
 * †Evopes veneratus – type locality for species
 * Exechia
 * †Exechia priscula – type locality for species
 * †Exenterus
 * †Exenterus dormitans – type locality for species
 * †Exetastes
 * †Exetastes inveteratus – type locality for species
 * †Exitelus – type locality for genus
 * †Exitelus exsanguis – type locality for species
 * †Exochilum
 * †Exochilum inusitatum – type locality for species
 * †Exochus
 * †Exochus captus – type locality for species
 * †Exostinus – type locality for genus
 * †Exostinus serratus – type locality for species

F

 * †Fagopsis
 * †Fagopsis longifolia
 * Falcipennis
 * †Falcipennis canadenis
 * Falco
 * AmericanKestrel02.jpg †[[Falco sparverius]]
 * †Fenusa – type locality for genus
 * †Fenusa parvus – type locality for species
 * †Fenusa primula – type locality for species
 * †Fibla
 * †Fibla exusta – type locality for species
 * Ficus
 * †Ficus affinis
 * †Ficus artocarpoides
 * †Ficus bruesi
 * †Ficus florissantella
 * †Ficus florissantia
 * †Ficus minutidens
 * †Ficus planicostata
 * †Ficus subtruncata
 * †Ficus uncata
 * †Figites
 * †Figites solus – type locality for species
 * †Florimena – type locality for genus
 * †Florimena impressa – type locality for species
 * †Floriscolia – type locality for genus
 * †Floriscolia relicta – type locality for species
 * †Florissantia (planthopper) – type locality for genus
 * †Florissantia elegans – type locality for species
 * Florissantia species SRIC 01.jpg sp. fossil flower ]] †Florissantia (plant)'' – type locality for genus
 * †Florissantia speirii
 * †Florissantinus – type locality for genus
 * †Florissantinus angulatus – type locality for species
 * †Florissantoraphidia
 * †Florissantoraphidia funerata – type locality for species
 * †Florissantoraphidia mortua – type locality for species
 * > Formica
 * †Formica cockerelli – type locality for species
 * †Formica grandis – type locality for species
 * †Formica neorufibarbis
 * †Formica robusta – type locality for species
 * †Fornax
 * †Fornax relictus – type locality for species
 * †Frangulops – type locality for genus
 * †Frangulops pseudostenophylla – type locality for species. Formerly known as Ilex pseudostenophylla.
 * †Franimys – tentative report
 * †Fraxinus
 * †Fraxinus eocenica
 * Fulgora
 * †Fulgora obticescens – type locality for species
 * Fulica
 * American coot - June 2013.jpg [[Fulica americana]]
 * †Fuscus – tentative report
 * †Fuscus faecatus – type locality for species

G

 * †Galesimorpha
 * †Galesimorpha wheeleri – type locality for species
 * †Gastrallanobium – type locality for genus
 * †Gastrallanobium subconfusum – type locality for species
 * †Gaurotes
 * †Gaurotes striatopunctatus – type locality for species
 * †Gelastops
 * †Gelastops parcus
 * †Geocoris
 * †Geocoris infernorum – type locality for species
 * Geodromicus
 * †Geodromicus abditus – type locality for species
 * Geomys
 * Geomys bursarius.jpg †[[Geomys bursarius]]
 * †Geotiphia – type locality for genus
 * †Geotiphia foxiana – type locality for species
 * †Geotiphia halictina – type locality for species
 * †Geotiphia pachysoma – type locality for species
 * †Geotiphia sternbergi – type locality for species
 * †Geralophus
 * †Geralophus antiquarius
 * †Geralophus discessus – type locality for species
 * †Geralophus fossicius
 * †Geralophus lassatus
 * †Geralophus occultus
 * †Geralophus pumiceus – type locality for species
 * †Geralophus repositus
 * †Geralophus retritus – type locality for species
 * †Geralophus saxuosus – type locality for species
 * †Geralophus scudderi – type locality for species
 * †Geranchon – type locality for genus
 * †Geranchon davisii – type locality for species
 * †Geron – tentative report
 * †Geron platysoma – type locality for species
 * †Geroncolabis
 * †Geroncolabis commixta – type locality for species
 * †Geroncolabis tertiaria – type locality for species
 * Gerris
 * †Gerris protobates – type locality for species
 * Titanotylopus nebraskensis skeleton.jpg]] †Gigantocamelus''
 * †Glossina – type locality for genus
 * †Glossina oligocenus – type locality for species
 * †Glossina osborni – type locality for species
 * †Glypta
 * †Glypta aurora – type locality for species
 * †Glyptosaurus
 * †Glyptosaurus sylvestris
 * †Glyptostrobu
 * †Glyptostrobu nordenskioldi
 * Glyptostrobus
 * †Glyptostrobus nordenskioldi
 * †Gnathium
 * †Gnathium aetatis – type locality for species
 * Gnophomyia
 * †Gnophomyia seiverti – type locality for species
 * †Gomphocerus
 * †Gomphocerus abstrusus – type locality for species
 * Gomphotherium productum.jpg †[[Gomphotherium]]
 * †Gomphotherium obscurum
 * †Gonodera
 * †Gonodera antiqua – type locality for species
 * †Gonodera vulcanica – type locality for species
 * †Gorytes
 * †Gorytes archoryctes – type locality for species
 * †Grammoptera
 * †Grammoptera nanella – type locality for species
 * †Gregorymys
 * †Gregorymys larsoni
 * †Gryllacris
 * †Gryllacris cineris – type locality for species
 * †Gryllacris mutilata – type locality for species
 * Plos One 0133330 fig 2 Gyaclavator kohlsi A.PNG †[[Gyaclavator]] – type locality for genus
 * †Gyaclavator kohlsi – type locality for species
 * †Gymnetron
 * †Gymnetron antecurrens – type locality for species
 * †Gymnopternus
 * †Gymnopternus lacustris – type locality for species
 * †Gymnorhinus
 * †Gymnorhinus cyanocephatus
 * †Gypona
 * †Gypona cinercia – type locality for species
 * †Gyrophaena
 * †Gyrophaena saxicola – type locality for species

H

 * †Hadrianus
 * †Hadrianus corsoni
 * †Hadronema
 * †Hadronema cinerescens – type locality for species
 * Halesia
 * †Halesia reticulata
 * †Hammapteryx
 * †Hammapteryx ceryniiformis – type locality for species
 * †Hammapteryx lepidoides – type locality for species
 * †Hammapteryx tripunctata – type locality for species
 * Hapalodectes serus.JPG †[[Hapalodectes]]
 * †Hapalodectes leptognathus – or unidentified comparable form
 * †Haplaletes
 * †Haplaletes pelicatus
 * †Haploconus
 * †Haploconus entoconus – or unidentified comparable form
 * †Haplolambda
 * †Haplolambda quinni
 * †Haplomylus
 * †Haplomylus simpsoni
 * †Haplomylus speirianus
 * Harpalus
 * †Harpalus maceratus – type locality for species
 * †Harpalus nuperus – type locality for species
 * †Harpalus redivivus – type locality for species
 * †Harpalus ulomaeformis – type locality for species
 * †Harpalus veterum – type locality for species
 * †Harpalus whitfieldii
 * †Harrymys
 * †Heeria – type locality for genus
 * †Heeria foeda – type locality for species
 * †Heeria gulosa – type locality for species
 * †Heeria lapidosa – type locality for species
 * †Helaletes
 * †Helaletes nanus – or unidentified comparable form
 * †Helichus
 * †Helichus eruptus – type locality for species
 * †Helichus tenuior – type locality for species
 * †Heliscomys
 * †Heliscomys vetus
 * †Hellwigia
 * †Hellwigia obsoleta – type locality for species
 * Helophorus
 * †Helophorus auricollis
 * †Helophorus eclectus
 * †Hemiacodon
 * Fossil maxilla Hemiauchenia Boulle.png relative Hemiauchenia]] †Hemiauchenia
 * †Hemiauchenia macrocephala
 * †Hemiteles
 * †Hemiteles lapidescens – type locality for species
 * †Hemiteles obtectus – type locality for species
 * †Hemiteles priscus – type locality for species
 * †Hemiteles veternus – type locality for species
 * †Heptacodon
 * †Heptodon
 * †Heptodon calciculus
 * †Heptodon posticus
 * †Heriades
 * †Heriades bowditchi – type locality for species
 * †Heriades halictinus – type locality for species
 * †Heriades laminarum – type locality for species
 * †Heriades mersatus – type locality for species
 * †Heriades mildredae – type locality for species
 * †Heriades priscus – type locality for species
 * †Heriades saxosus – type locality for species
 * †Herpetotherium
 * †Herpetotherium fugax
 * †Herpetotherium innominatum
 * †Herpetotherium knighti
 * Hersiliola
 * †Hesperagrion
 * †Hesperagrion praevolans – type locality for species
 * †Hesperhys
 * Cynodictis.jpg †[[Hesperocyon]]
 * †Hesperocyon coloradensis
 * †Hesperocyon gregarius
 * †Hesperolagomys
 * Heterodon
 * †Heterodon nasicus
 * †Heteromyza
 * †Heteromyza detecta – type locality for species
 * †Heteromyza miocenica – type locality for species
 * †Heterothops
 * †Heterothops conticens – type locality for species
 * †Hexacodus
 * †Hexacodus pelodes
 * †Hexerites – type locality for genus
 * †Hexerites primalis – type locality for species
 * Heyderia abietis 52203.jpg †[[Heyderia]]
 * †Heyderia coloradensis – type locality for species
 * †Hiatensor
 * †Hiatensor semirutus – type locality for species
 * †Hipporhinops – type locality for genus
 * †Hipporhinops sternbergi – type locality for species
 * †Hirmoneura – type locality for genus
 * †Hirmoneura willistoni – type locality for species
 * Holbrookia
 * †Holbrookia maculata
 * †Holcorpa – type locality for genus
 * †Holcorpa maculosa – type locality for species
 * †Homoeogamia
 * †Homoeogamia ventriosa – type locality for species
 * Homogalax tapirinus.JPG †[[Homogalax]]
 * †Homogalax protapirinus
 * †Hoplia
 * †Hoplia striatipennis – type locality for species
 * †Hoplisidia – type locality for genus
 * †Hoplisidia kohliana – type locality for species
 * †Hoplocampa
 * †Hoplocampa ilicis – type locality for species
 * †Hoplochelys
 * †Hoplochelys crassa
 * †Horistonotus
 * †Horistonotus coloradensis – type locality for species
 * †Hormorus
 * †Hormorus saxorum – type locality for species
 * †Humulus
 * †Humulus florissantellus
 * Hyaenodon NT small.jpg †[[Hyaenodon]]
 * †Hyaenodon crucians
 * †Hyaenodon horridus
 * †Hyaenodon mustelinus
 * †Hydnobius
 * †Hydnobius tibialis – type locality for species
 * Hydraena
 * †Hydraena circulata – or unidentified comparable form
 * Hydrangea
 * †Hydrangea antica
 * †Hydrangea fraxinifolia
 * Hydriomena – tentative report
 * †Hydriomena? protrita – type locality for species
 * Hydrobius
 * Hydrobius fuscipes.jpg †[[Hydrobius fuscipes]]
 * †Hydrobius maceratus – type locality for species
 * †Hydrobius prisconatator – type locality for species
 * †Hydrobius titan – type locality for species
 * †Hydromystria
 * †Hydromystria expansa
 * Hydrophilus
 * †Hydrophilus extricatus – type locality for species
 * Hydroporus
 * †Hydroporus sedimentorum – type locality for species
 * Hydropsyche
 * †Hydropsyche marcens – type locality for species
 * †Hydropsyche operta – type locality for species
 * †Hydropsyche scudderi – type locality for species
 * †Hydroptila
 * †Hydroptila phileos – type locality for species
 * Hygrotus inaequalis (Fabricius, 1776).jpg [[Hygrotus]]
 * †Hygrotus miocenus – type locality for species
 * Hylastes
 * †Hylastes americanus – type locality for species
 * †Hylastes nigrinus
 * †Hylesinus – type locality for genus
 * †Hylesinus dormiscens – type locality for species
 * †Hylesinus extractus – type locality for species
 * †Hylesinus hydropicus – type locality for species
 * †Hylobius
 * †Hylobius lacoei – type locality for species
 * †Hylomeryx
 * Hylurgops
 * †Hylurgops piger – type locality for species
 * †Hymenophyllum
 * †Hymenophyllum confusum
 * †Hymenorus
 * †Hymenorus haydeni – type locality for species
 * Hyopsodus.jpg †[[Hyopsodus]]
 * †Hyopsodus loomisi
 * †Hyopsodus lysitensis
 * †Hyopsodus paulus
 * †Hyopsodus powellianus
 * †Hyopsodus simplex
 * †Hyopsodus walcottianus
 * †Hyopsodus wortmani
 * †Hypertragulus
 * †Hypertragulus calcaratus
 * †Hypisodus
 * †Hypisodus minimus
 * Hypnum
 * †Hypnum coloradense
 * †Hypnum haydenii
 * †Hypohippus
 * †Hypohippus osborni – type locality for species
 * †Hypolagus
 * †Hyporhina
 * †Hyporhina galbreathi – type locality for species
 * †Hyposodus
 * †Hyposodus loomisi
 * †Hyrachyus
 * †Hyrachyus modestus
 * Knight Hyracodon cropped.png †[[Hyracodon]]
 * †Hyracodon arcidens – type locality for species
 * †Hyracodon leidyanus
 * †Hyracodon nebraskensis
 * †Hyracotherium
 * †Hyracotherium vasacciense
 * †Hystricops

I

 * †Ichneumon
 * †Ichneumon alpha – type locality for species
 * †Ichneumon concretus – type locality for species
 * †Ichneumon decrepitus – type locality for species
 * †Ichneumon dormitans – type locality for species
 * †Ichneumon exesus – type locality for species
 * †Ichneumon obduratus – type locality for species
 * †Ichneumon petrinus – type locality for species
 * †Ichneumon pollens – type locality for species
 * †Ichneumon primigenius – type locality for species
 * †Ichneumon provectus – type locality for species
 * †Ichneumon somniatus – type locality for species
 * †Ichneumon torpefactus – type locality for species
 * †Ignacius
 * †Ignacius frugivorus
 * Ilex-aquifolium (Europaeische Stechpalme-1).jpg [[Ilex]]
 * †Ilex artocarpidioides
 * †Ilex knightiaefolia
 * †Ilex pseudostenophylla – type locality for species. Later reclassified in the new genus Frangulops.
 * †Indusia
 * †Indusia cypridis – type locality for species
 * †Iridomyrmex
 * †Iridomyrmex florissantius – type locality for species
 * †Iridomyrmex obscurans – type locality for species
 * Ischnoptera
 * †Ischnoptera brunneri – type locality for species
 * Ischyromys.jpg   †[[Ischyromys]]
 * †Ischyromys douglassi – or unidentified comparable form
 * †Ischyromys typus
 * †Ischyromys veterior – or unidentified comparable form
 * †Isectolophus
 * †Isectolophus annectens
 * †Isoetites
 * †Isoetites horridus
 * †Isomira
 * †Isomira aurora – type locality for species
 * †Isomira florissantensis – type locality for species
 * †Isothea – type locality for genus
 * †Isothea alleni – type locality for species
 * †Isotrilophus
 * †Isotrilophus rasnitsyni – type locality for species
 * †Iulus
 * †Iulus florissantellus – type locality for species

J

 * †Jadera
 * †Jadera interita – type locality for species
 * †Janus
 * †Janus disperditus – type locality for species
 * †Jassopsis – type locality for genus
 * †Jassopsis evidens – type locality for species
 * Jassus – tentative report. Lapsus calami of Iassus.
 * †"Jassus" latebrae – type locality for species
 * †Judolia
 * †Judolia antecurrens – type locality for species
 * Juglans major Morton.jpg [[Juglans]]
 * †Juglans berryana
 * Junco
 * †Junco hyemalis
 * †Juncus
 * †Juncus crassulus
 * †Jungermanniopsis
 * †Jungermanniopsis cockerellii
 * †Jupitellia – type locality for genus
 * †Jupitellia charon – type locality for species

K

 * Mountain laurel blooms (5940253290).jpg †[[Kalmia]]
 * †Kalmia elliptica
 * †Kimbetohia
 * †Kimbetohia mziae – type locality for species
 * †Knightomys
 * †Knightomys depressus
 * †Knightomys huerfanensis
 * Koelreuteria
 * †Koelreuteria alleni
 * †Kohlsimyrma – type locality for genus
 * †Kohlsimyrma gracilis – type locality for species
 * †Kohlsimyrma laticeps – type locality for species
 * †Kohlsimyrma longiceps – type locality for species
 * †Kronolictus – type locality for genus
 * †Kronolictus scudderiellus – type locality for species
 * †Kronolictus vulcanus – type locality for species

L

 * †Laasbium – type locality for genus
 * †Laasbium agassizii – type locality for species
 * †Laasbium sectile – type locality for species
 * †Labandeiraia – type locality for genus
 * †Labandeiraia americaborealis – type locality for species
 * †Labidolemur
 * †Labidolemur kayi
 * †Labidolemur serus
 * †Labidolemur soricoides – type locality for species
 * †Labiduromma
 * †Labiduromma avia – type locality for species
 * †Labiduromma bormansi – type locality for species
 * †Laccopygus – type locality for genus
 * †Laccopygus nilesii – type locality for species
 * †Lachnopus
 * †Lachnopus humatus – type locality for species
 * †Lachnopus recuperatus – type locality for species
 * †Lacon
 * †Lacon exhumatus – type locality for species
 * White-tailed Ptarmigan. Highwood, Alberta.jpg, or white-tailed ptarmigan, in full summer plumage]] †Lagopus''
 * †Lagopus leucurus
 * †Lambdotherium
 * †Lambdotherium popoagicum – type locality for species
 * †Lampronota
 * †Lampronota pristina – type locality for species
 * †Lampronota stygialis – type locality for species
 * †Lampronota tenebrosa – type locality for species
 * †Lapton
 * †Lapton daemon – type locality for species
 * Larus
 * †Lasiopa
 * †Lasiopa carpenteri – type locality for species
 * Lasiopodomys
 * †Lasiopodomys deceitensis
 * Lasius
 * †Lasius peritulus – type locality for species
 * †Lastrea
 * †Lastrea goldiana
 * Lathrobium
 * †Lathrobium antediluvianum – type locality for species
 * †Laurophyllum
 * †Laurophyllum caudatum
 * †Laurophyllum perseanum
 * Fanal Madeira 2016 2.jpg [[Laurus]]
 * †Laurus socialis
 * †Lebia
 * †Lebia protospiloptera – type locality for species
 * †Leguminosites
 * †Leguminosites coloradensis
 * †Leguminosites lespedezoides – type locality for species
 * †Leguminosites lesquereuxiana
 * †Leia
 * †Leia miocenica – type locality for species
 * †Lema
 * †Lema evanescens – type locality for species
 * †Lema fortior – type locality for species
 * †Lema lesquereuxi – type locality for species
 * Lemmiscus
 * †Lemmiscus curtatus
 * †Lepismophlebia
 * †Lepismophlebia platymera – type locality for species
 * Longnose gar.png [[Lepisosteus]]
 * †Leptacinus
 * †Leptacinus exsucidus – type locality for species
 * †Leptacinus fossus – type locality for species
 * †Leptacinus leidyi – type locality for species
 * †Leptacinus maclurei – type locality for species
 * †Leptacinus rigatus – type locality for species
 * †Leptacodon
 * †Leptacodon tener – type locality for species
 * †Leptarctus
 * †Leptarctus primus
 * †Leptauchenia
 * †Leptauchenia decora
 * †Leptauchenia major
 * †Leptis
 * †Leptis mystaceaeformis – type locality for species
 * †Leptobatopsis
 * †Leptobatopsis ashmeadii – type locality for species
 * †Leptobrochus – type locality for genus
 * †Leptobrochus luteus – type locality for species
 * †Leptochoerus
 * †Leptochoerus spectabilis
 * Leptocyon gregorii holotype AMNH 12879.jpg †[[Leptocyon]]
 * †Leptocyon vafer
 * †Leptogaster
 * †Leptogaster prior – type locality for species
 * †Leptomeryx
 * †Leptomeryx esulcatus
 * †Leptomeryx evansi
 * †Leptomeryx speciosus
 * †Leptomorphus
 * †Leptomorphus palaeospilus – type locality for species
 * Leptophloeus
 * †Leptophloeus alternans – or unidentified comparable form
 * †Leptostylus
 * †Leptostylus scudderi – type locality for species
 * †Leptotomus
 * †Leptotomus parvus
 * †Leptura
 * †Leptura petrorum – type locality for species
 * †Leptura ponderosissima – type locality for species
 * †Leptura wickhami – type locality for species
 * Lepus
 * White tailed jackrabbit 20140530.jpg †[[Lepus townsendii]]
 * †Lestomyia
 * †Lestomyia miocenica – type locality for species
 * †Leucosticte
 * †Leucosticte atrata
 * †Leucosticte tephrocotis
 * †Leucozona
 * †Leucozona nigra – type locality for species
 * †Libellulapis – type locality for genus
 * †Libellulapis antiquorum – type locality for species
 * †Libellulapis wilmattae – type locality for species
 * †Lichnanthe
 * †Lichnanthe defuncta – type locality for species
 * †Ligyrocoris
 * †Ligyrocoris exsuctus – type locality for species
 * †Ligyrus
 * †Ligyrus compositus – type locality for species
 * †Ligyrus effetus – type locality for species
 * Limnephilus.auricula.jpg †[[Limnephilus]]
 * †Limnephilus eocenicus – type locality for species
 * †Limnerium
 * †Limnerium consuetum – type locality for species
 * †Limnerium depositum – type locality for species
 * †Limnerium plenum – type locality for species
 * †Limnerium tectum – type locality for species
 * †Limnerium vetustum – type locality for species
 * †Limnobium
 * †Limnobium obliteratum
 * †Limnocema
 * †Limnocema lutescens – type locality for species
 * †Limnocema marcescens – type locality for species
 * †Limnocema mortoni – type locality for species
 * †Limnocema sternbergi – type locality for species
 * †Limnocema styx – type locality for species
 * †Limnoecus
 * †Limnoecus compressus
 * †Limnophila
 * †Limnophila rogersii – type locality for species
 * †Limnophila vasta – type locality for species
 * †Limnophilus
 * †Limnophilus soporatus – type locality for species
 * †Limnopsyche – type locality for genus
 * †Limnopsyche dispersa – type locality for species
 * †Limonius
 * †Limonius aboriginalis – type locality for species
 * †Limonius florissantensis – type locality for species
 * †Limonius praecursor – type locality for species
 * †Limonius shoshonis – type locality for species
 * †Limonius volans – type locality for species
 * Lindera
 * †Lindera coloradica – type locality for species
 * †Lindera obtusata
 * †Lindera varifolia – type locality for species
 * Linnaea borealis 8803.JPG †[[Linnaea]] – type locality for genus
 * †Linnaea abolita – type locality for species
 * †Linnaea carcerata – type locality for species
 * †Linnaea evoluta – type locality for species
 * †Linnaea gravida – type locality for species
 * †Linnaea holmesii – type locality for species
 * †Linnaea putnami – type locality for species
 * †Linyphia
 * †Linyphia byrami – type locality for species
 * †Linyphia florissanti – type locality for species
 * †Linyphia pachygnathoides – type locality for species
 * †Linyphia retensa – type locality for species
 * †Linyphia seclusa – type locality for species
 * Liometopum occidentale casent0005328 profile 1.jpg †[[Liometopum]]
 * †Liometopum miocenicum – type locality for species
 * †Liometopum scudderi – type locality for species
 * †Listrochelus
 * †Listrochelus puerilis – type locality for species
 * †Listroderes
 * †Listroderes differens – type locality for species
 * †Listroderes evisceratus – type locality for species
 * †Lithagrion
 * †Lithagrion hyalinum – type locality for species
 * †Lithandrena – type locality for genus
 * †Lithandrena saxorum – type locality for species
 * †Lithanthidium – type locality for genus
 * †Lithanthidium pertriste – type locality for species
 * †Lithecphora – type locality for genus
 * †Lithecphora diaphana – type locality for species
 * †Lithecphora murata – type locality for species
 * †Lithecphora setigera – type locality for species
 * †Lithecphora unicolor – type locality for species
 * †Lithembia
 * †Lithembia florissantensis – type locality for species
 * †Litheuphaea
 * †Litheuphaea coloradensis – type locality for species
 * †Lithocharis
 * †Lithocharis scottii – type locality for species
 * †Lithochromus – type locality for genus
 * †Lithochromus extraneus – type locality for species
 * †Lithochromus gardneri – type locality for species
 * †Lithochromus mortuarius – type locality for species
 * †Lithochromus obstrictus – type locality for species
 * †Lithocicada – type locality for genus
 * †Lithocicada perita – type locality for species
 * †Lithocoris – type locality for genus
 * †Lithocoris evulsus – type locality for species
 * †Lithocoryne – type locality for genus
 * †Lithocoryne arcuata – type locality for species
 * †Lithocoryne coloradensis – type locality for species
 * †Lithocoryne gravis – type locality for species
 * Lithodryas styx.JPG †[[Lithodryas]] – type locality for genus
 * †Lithodryas styx – type locality for species
 * †Lithogryllites
 * †Lithogryllites lutzii – type locality for species
 * †Litholabis
 * †Litholabis gilberti – type locality for species
 * †Lithomacratria – type locality for genus
 * †Lithomacratria mirabilis – type locality for species
 * †Lithomyza – type locality for genus
 * †Lithomyza condita – type locality for species
 * †Lithophotina – type locality for genus
 * †Lithophotina costalis – type locality for species
 * †Lithophotina floccosa – type locality for species
 * †Lithophthorus – type locality for genus
 * †Lithophthorus rugosicollis – type locality for species
 * †Lithopsis
 * †Lithopsis delicata – type locality for species
 * †Lithopsis dubiosa – type locality for species
 * †Lithopsis fimbriata – or unidentified comparable form
 * †Lithopsis simillima – type locality for species
 * †Lithoserix – type locality for genus
 * †Lithoserix williamsi – type locality for species
 * †Lithosmylus
 * †Lithosmylus columbianus – type locality for species
 * †Lithotiphia – type locality for genus
 * †Lithotiphia scudderi – type locality for species
 * †Lithymnetes – type locality for genus
 * †Lithymnetes guttatus – type locality for species
 * †Litobrochus – type locality for genus
 * †Litobrochus externatus – type locality for species
 * †Litomylus
 * †Litomylus ishami
 * †Locrites – type locality for genus
 * †Locrites copei – type locality for species
 * †Locrites whitei – type locality for species
 * †Locusta
 * †Locusta silens – type locality for species
 * Lomatia
 * †Lomatites
 * †Lomatites spinosa
 * Longitarsus
 * Lontra
 * LutraCanadensis fullres.jpg †[[Lontra canadensis]] – or unidentified comparable form
 * †Lophiparamys
 * †Lophiparamys debequensis
 * Lordithon
 * †Lordithon durabilis – type locality for species
 * †Lordithon funditus – type locality for species
 * †Lordithon longiceps
 * †Lordithon lyelli – type locality for species
 * †Lordithon stygis – type locality for species
 * †Loveina
 * †Loveina zephyri
 * †Lowesaurus
 * †Lowesaurus matthewi – type locality for species
 * †Loxolophus
 * †Loxolophus hyattianus
 * †Lucanus
 * †Lucanus fossilis – type locality for species
 * †Lucidota
 * †Lucidota prima – type locality for species
 * †Ludiophanes – type locality for genus
 * †Ludiophanes haydeni – type locality for species
 * †Ludius
 * †Ludius exanimatus – type locality for species
 * †Ludius granulicollis – type locality for species
 * †Ludius heeri – type locality for species
 * †Ludius laevissimus – type locality for species
 * †Ludius primitivus – type locality for species
 * †Ludius propheticus – type locality for species
 * †Ludius restructus – type locality for species
 * †Ludius submersus – type locality for species
 * †Luperodes
 * †Luperodes submonilis – type locality for species
 * †Lutrochites – type locality for genus
 * †Lutrochites lecontei – type locality for species
 * Lycosa leuckarti 03.jpg †[[Lycosa]]
 * †Lycosa florissanti – type locality for species
 * †Lygaeus
 * †Lygaeus faeculentus – type locality for species
 * †Lygaeus obsolescens – type locality for species
 * †Lygaeus stabilitus – type locality for species
 * Lygodium
 * †Lygodium coloradense
 * †Lygodium kaulfussi
 * Lynx
 * †Lynx rufus
 * Lytta
 * †Lytta lithophila – type locality for species

M

 * †Macratria
 * †Macratria gigantea – type locality for species
 * Macrocranion tenerum - reconstruction.png [[Macrocranion]]
 * †Macrocranion nitens
 * †Macrodactylus
 * †Macrodactylus pluto – type locality for species
 * †Macrodactylus propheticus – type locality for species
 * †Macrophya
 * †Macrophya pervetusta – type locality for species
 * †Macrorhoptus
 * †Macrorhoptus intutus – type locality for species
 * Magdalis
 * †Magdalis lecontei
 * †Magdalis sedimentorum – type locality for species
 * Sweetbay Magnolia Magnolia virginiana Flower Closeup 2146px.jpg [[Magnolia]]
 * †Magnolia berryi
 * †Magnolia magnifolia
 * †Magnolia regalis
 * †Magnolia rotundifolia
 * Mahonia
 * †Mahonia marginata
 * †Mahonia obliqua – type locality for species
 * †Mahonia subdenticulata
 * †Maiorana
 * †Malachius
 * †Malachius immurus – type locality for species
 * †Malus
 * †Malus florissantensis
 * †Malus pseudocredneria
 * †Mammuthus
 * Columbian mammoth cropped.png †[[Mammuthus columbi]]
 * †Manapsis – type locality for genus
 * †Manapsis anomala – type locality for species
 * Marmota
 * †Marmota flaviventris
 * †Marquettia
 * †Marquettia americana – type locality for species
 * Marsilea
 * †Marsilea sprungerorum
 * Martes
 * †Masteutes
 * †Masteutes rupis – type locality for species
 * †Masteutes saxifer – type locality for species
 * †Mataeoschistus – type locality for genus
 * †Mataeoschistus limigenus – type locality for species
 * †Matthewlabis
 * †Matthewlabis cedrensis
 * †Mattimys
 * †Mecistoneuron – type locality for genus
 * †Mecistoneuron perpetuum – type locality for species
 * Mecocephala
 * Megacerops-coloradensis.jpg †[[Megacerops]]
 * †Megacerops kuwagatarhinus
 * Megachile
 * †Megachile praedicta – type locality for species
 * †Megacyllene
 * †Megacyllene florissantensis – type locality for species
 * †Megadelphus
 * †Megadelphus lundeliusi
 * †Megahippus
 * †Megalagus
 * †Megalagus brachydon
 * †Megalagus brachyodon
 * †Megalagus turgidus
 * †Megalesthonyx
 * †Megalictis
 * †Megapenthes
 * †Megapenthes primaevus – type locality for species
 * †Megaraphidia – type locality for genus
 * †Megaraphidia elegans – type locality for species
 * †Megaraphidia exhumata – type locality for species
 * †Megatryphon – type locality for genus
 * †Megatryphon mortiferus – type locality for species
 * †Megatylopus
 * †Megatylopus gigas – or unidentified comparable form
 * †Megaxyela
 * †Megaxyela petrefacta – type locality for species
 * †Melanactes
 * †Melanactes cockerelli – type locality for species
 * †Melanagrion
 * †Melanagrion nigerrimum – type locality for species
 * †Melanagrion umbratum – type locality for species
 * †Melanagromyza
 * †Melanagromyza prisca – type locality for species
 * †Melanagromyza tephrias – type locality for species
 * †Melanderella
 * †Melanderella glossalis – type locality for species
 * †Melanophila
 * †Melanophila cockerellae – type locality for species
 * †Melanophila handlirschi – type locality for species
 * †Melanophila heeri – type locality for species
 * Melanthrips
 * †Melanthrips extincta – type locality for species
 * †Melieria
 * †Melieria atavina – type locality for species
 * †Melieria calligrapha – type locality for species
 * †Melittomma
 * †Melittomma lacustrinum – type locality for species
 * †Mellinus
 * †Mellinus handlirschi – type locality for species
 * Melospiza
 * †Melospiza lincolnii
 * †Meniscotherium
 * †Meniscotherium chamense
 * †Meniscotherium tapiacitum
 * Menoceras NT small.jpg †[[Menoceras]]
 * †Menoceras barbouri
 * Mephitis
 * †Mephitis mephitis
 * †Meracantha
 * †Meracantha lacustris – type locality for species
 * †Merychippus
 * †Merychippus coloradense
 * †Merychippus sejunctus
 * †Merychyus
 * †Merychyus arenarum
 * †Merychyus elegans – type locality for species
 * †Merycochoerus
 * †Merycochoerus magnus
 * †Merycochoerus matthewi
 * †Merycodus
 * †Merycodus warreni
 * †Merycoidodon – type locality for genus
 * †Merycoidodon culbertsoni – type locality for species
 * †Merycoidodon major
 * †Mesatirhinus
 * †Mesatirhinus junius
 * †Mesobrochus – type locality for genus
 * †Mesobrochus imbecillus – type locality for species
 * †Mesobrochus lethaeus – type locality for species
 * †Mesochorus
 * †Mesochorus abolitus – type locality for species
 * †Mesochorus aboriginalis – type locality for species
 * †Mesochorus carceratus – type locality for species
 * †Mesochorus cataclysmi – type locality for species
 * †Mesochorus dormitorius – type locality for species
 * †Mesochorus lapideus – type locality for species
 * †Mesochorus revocatus – type locality for species
 * †Mesochorus terrosus – type locality for species
 * Mesocyon.jpeg †[[Mesocyon]]
 * †Mesocyon temnodon
 * †Mesodma
 * †Mesodma ambigua
 * †Mesodma hensleighi
 * †Mesogaulus
 * †Mesogaulus paniensis
 * †Mesohippus
 * †Mesohippus bairdi
 * †Mesoleptus
 * †Mesoleptus apertus – type locality for species
 * †Mesoleptus exstirpatus – type locality for species
 * †Mesoneura
 * †Mesoneura vexabilis – type locality for species
 * Mesonyx obtusidens cropped.png †[[Mesonyx]]
 * †Mesonyx obtusidens
 * †Mesopimpla – type locality for genus
 * †Mesopimpla sequoiarum – type locality for species
 * †Mesostenus
 * †Mesostenus modestus – type locality for species
 * Messor
 * †Messor sculpturatus – type locality for species
 * †Metacheiromys
 * Metachroma
 * †Metachroma florissantensis – type locality for species
 * †Metarhinus
 * Metasequoia
 * †Metasequoia occidentalis
 * †Metechinus
 * †Metechinus amplior
 * †Metoecus
 * †Metoecus geikiei – type locality for species
 * †Metrobates
 * †Metrobates aeternalis – type locality for species
 * Miacis cropped.png †[[Miacis]]
 * †Miacis edax
 * †Miacis exiguus
 * †Miacis latidens
 * †Miacis parvivorus
 * †Miacis vorax
 * Miagrammopes
 * †Mianeuretus – type locality for genus
 * †Mianeuretus eocenicus – type locality for species
 * †Mianeuretus mirabilis – type locality for species
 * †Michenia
 * †Microgaster
 * †Microgaster primordialis – type locality for species
 * †Microplitis
 * †Microplitis vesperus – type locality for species
 * †Microrhagus
 * †Microrhagus fossilis – type locality for species
 * †Microrhagus miocenicus – type locality for species
 * †Microrhagus vulcanicus – type locality for species
 * †Microstylum
 * †Microstylum destructum – type locality for species
 * †Microstylum wheeleri – type locality for species
 * †Microsyops
 * †Microsyops angustidens
 * †Microsyops annectens
 * †Microsyops elegans
 * †Microsyops knightensis
 * †Microsyops latidens
 * †Microsyops scottianus
 * †Microtomarctus
 * †Microtomarctus conferta
 * Microtus
 * California Vole (Microtus californicus) cropped.jpg †[[Microtus californicus]] – or unidentified comparable form
 * †Microtus longicaudus
 * †Microtus meadensis
 * †Microtus ochrogaster
 * †Microtus paroperarius
 * Mictomys
 * †Mictomys meltoni
 * †Mictomys vetus
 * †Mimomys
 * †Mimomys virginianus
 * †Mimoperadectes
 * †Mimoperadectes labrus
 * †Mimosites
 * †Mimosites coloradensis
 * †Mimotricentes
 * †Mimotricentes ischyrus – type locality for species
 * †Mindarus – type locality for genus
 * †Mindarus recurvus – type locality for species
 * †Mindarus scudderi – type locality for species
 * Miniochoerus.jpg †[[Miniochoerus]]
 * †Miniochoerus gracilis
 * †Miocaenia – type locality for genus
 * †Miocaenia pectinicornis – type locality for species
 * †Miocitta – type locality for genus
 * †Miocitta galbreathi – type locality for species
 * †Miocoris – type locality for genus
 * †Miocoris fagi – type locality for species
 * †Miocyphon – type locality for genus
 * †Miocyphon punctulatus – type locality for species
 * †Miodytiscus – type locality for genus
 * †Miodytiscus hirtipes – type locality for species
 * †Miogeraeus – type locality for genus
 * †Miogeraeus recurrens – type locality for species
 * Miohippus cropped.jpg   †[[Miohippus]]
 * †Miohippus obliquidens
 * †Miolabis
 * †Miolabis longiceps
 * †Miolachnosterna – type locality for genus
 * †Miolachnosterna tristoides – type locality for species
 * †Miolithocharis – type locality for genus
 * †Miolithocharis lithographica – type locality for species
 * †Miomyrmex
 * †Miomyrmex impactus – type locality for species
 * †Miomyrmex striatus – type locality for species
 * †Miophenolia – type locality for genus
 * †Miophenolia cilipes – type locality for species
 * †Miopodagrion
 * †Miopodagrion optimum – type locality for species
 * †Miosilpha – type locality for genus
 * †Miosilpha necrophiloides – type locality for species
 * †Miospermophilus
 * †Miospermophilus bryanti
 * †Miostenosis – type locality for genus
 * †Miostenosis lacordairei – type locality for species
 * Miracinonyx inexpectatus.jpg †[[Miracinonyx]]
 * †Miracinonyx inexpectatus – or unidentified comparable form
 * †Miracinonyx studeri
 * †Mischoserphus
 * †Mischoserphus bruesi – type locality for species
 * †Mitostylus
 * †Mitostylus abacus – type locality for species
 * †Mitostylus obdurefactus – type locality for species
 * †Monocrepidius
 * †Monocrepidius dubiosus – type locality for species
 * †Monophlebus
 * †Monophlebus simplex – type locality for species
 * †Monosaulax
 * †Monosaulax curtus
 * Mordella
 * †Mordella atrata – or unidentified comparable form
 * †Mordella lapidicola – type locality for species
 * †Mordella priscula – type locality for species
 * †Mordella stygia – type locality for species
 * Mordellistena
 * †Mordellistena florissantensis – type locality for species
 * †Mordellistena nearctica – type locality for species
 * †Mordellistena protogaea – type locality for species
 * †Mordellistena scudderiana – type locality for species
 * †Mordellistena smithiana – type locality for species
 * †Moropus
 * †Moropus elatus – or unidentified comparable form
 * Morus
 * †Morus symmetrica
 * †Moyamyia – type locality for genus
 * †Moyamyia limigena – type locality for species
 * Musca
 * †Musca vinculata – type locality for species
 * Mustela
 * †Mustela richardsonii
 * †Mustela nigripes
 * †Myas
 * †Myas rigefactus – type locality for species
 * †Myas umbrarum – type locality for species
 * †Mycetaulus
 * †Mycetaulus incretus – type locality for species
 * †Mycetophagus
 * †Mycetophagus exterminatus – type locality for species
 * †Mycetophagus willistoni – type locality for species
 * †Mycetophila
 * †Mycetophila bradenae – type locality for species
 * †Mycetophila occultata – type locality for species
 * Mycetoporus
 * †Mycetoporus demersus – type locality for species
 * †Mycomya
 * †Mycomya cockerelli – type locality for species
 * †Mycomya lithomendax – type locality for species
 * †Mydas
 * †Mydas miocenicus – type locality for species
 * Myrica faya fruit.jpg [[Myrica]]
 * †Myrica drymeja
 * †Myrmecites – type locality for genus
 * †Myrmecites rotundiceps – type locality for species
 * Myrmica
 * †Myrmica lobifrons
 * †Myrtophyllum
 * †Myrtophyllum torreyi
 * †Mystipterus
 * †Mystipterus martini
 * †Mytonomys
 * †Mytonomys coloradensis

N

 * †Najadopsis
 * †Najadopsis rugulosa
 * †Nannodectes
 * †Nannodectes gazini
 * †Nannodectes gidleyi
 * †Nannodectes simpsoni
 * †Nanodelphys
 * †Nanodelphys hunti
 * †Nanthacia
 * †Nanthacia torpida – type locality for species
 * †Navajovius
 * †Navajovius kohlhaasae – type locality for species
 * Nebria.brevicollis.-.lindsey.jpg [[Nebria]]
 * †Nebria occlusa – type locality for species
 * †Nebritus
 * †Nebritus willistoni – type locality for species
 * †Necrobia
 * †Necrobia divinatoria – type locality for species
 * †Necrobia sibylla – type locality for species
 * †Necrochromus – type locality for genus
 * †Necrochromus cockerelli – type locality for species
 * †Necrochromus labatus – type locality for species
 * †Necrochromus saxificus – type locality for species
 * †Necrocydnus – type locality for genus
 * †Necrocydnus amyzonus – type locality for species
 * †Necrocydnus revectus – type locality for species
 * †Necrocydnus senior – type locality for species
 * †Necrocydnus solidatus – type locality for species
 * †Necrocydnus stygius – type locality for species
 * †Necrocydnus torpens – type locality for species
 * †Necrocydnus vulcanius – type locality for species
 * †Necrodes
 * †Necrodes primaevus – type locality for species
 * †Necropsylla – type locality for genus
 * †Necropsylla rigida – type locality for species
 * †Necropsylla rigidula – type locality for species
 * †Nelumbium
 * †Nelumbium tenuifolium
 * †Nemognatha
 * †Nemognatha exsecta – type locality for species
 * Neohypnus
 * Neogale
 * †Neogale frenata
 * †Neogale vison
 * †Neoliotomus
 * †Neoliotomus conventus
 * †Neoliotomus ultimus
 * Neoptochus – tentative report
 * †Neorhynchocephalus
 * †Neorhynchocephalus melanderi – type locality for species
 * †Neorhynchocephalus occultator – type locality for species
 * †Neorhynchocephalus vulcanicus – type locality for species
 * Neotoma
 * †Neotoma cinerea
 * †Neotoma ozarkensis
 * †Nepa
 * †Nepa vulcanica – type locality for species
 * Golden silk spider - Nephila clavipes.jpg †[[Nephila]]
 * †Nephila pennatipes – type locality for species
 * †Netelia
 * †Netelia memorialis – type locality for species
 * †Neurodromicus – type locality for genus
 * †Neurodromicus dorsalis – type locality for species
 * †Nicocles
 * †Nicocles miocenicus – type locality for species
 * †Niptomomys
 * †Niptomomys doreenae – type locality for species
 * Nitidotachinus
 * †Nitidotachinus lanei
 * Nitidula
 * †Nitidula prior – type locality for species
 * †Nordenskioldia
 * †Nordenskioldia borealis
 * †Nortonella – type locality for genus
 * †Nortonella typica – type locality for species
 * †Nosotetocus – type locality for genus
 * †Nosotetocus debilis – type locality for species
 * †Nosotetocus marcovi – type locality for species
 * †Nosotetocus vespertinus – type locality for species
 * Notharctus tenebrosus AMNH.jpg   †[[Notharctus]]
 * †Notharctus robinsoni
 * †Notharctus robustior
 * †Nothopus
 * †Nothopus kingii – type locality for species
 * †Nothoserphus
 * †Nothoserphus rasnitsyni – type locality for species
 * Notonecta
 * †Notonecta binuda – type locality for species
 * †Notonecta emersoni – type locality for species
 * †Notoparamys
 * †Notoparamys arctios – type locality for species
 * †Notoparamys costilloi
 * Numenius
 * †Numenius madagascariensis
 * †Numitor – type locality for genus
 * †Numitor claviger – type locality for species
 * †Nyctea
 * †Nyctea scandiaca
 * †Nyctitherium
 * †Nyctitherium velox – or unidentified comparable form
 * †Nyktalos – type locality for genus
 * †Nyktalos uhleri – type locality for species
 * †Nyktalos vigil – type locality for species
 * Peach Glow water-lily at Brooklyn Botanic Garden.jpg [[Nymphaea]]
 * †Nymphaea leei
 * †Nymphaea pulchella
 * †Nymphalites – type locality for genus
 * †Nymphalites obscurus – type locality for species
 * †Nymphalites scudderi – type locality for species
 * Nysius
 * †Nysius stratus – type locality for species
 * †Nysius terrae – type locality for species
 * †Nysius tritus – type locality for species
 * †Nysius vecula – type locality for species
 * †Nysius vinctus – type locality for species
 * †Nyssa
 * †Nyssa alata
 * †Nyssa obovata

O

 * Ochotona
 * †Ochotona princeps
 * †Ocymoromelitta – type locality for genus
 * †Ocymoromelitta florissantella – type locality for species
 * †Ocymoromelitta miocenica – type locality for species
 * †Ocymoromelitta sorella – type locality for species
 * †Odaxosaurus – or unidentified comparable form
 * †Odaxosaurus piger
 * Odocoileus
 * Mule buck doe elk creek r myatt (5489811074).jpg †[[Odocoileus hemionus]]
 * †Odynerus
 * †Odynerus palaeophilus – type locality for species
 * †Odynerus percontusus – type locality for species
 * †Odynerus praesepultus – type locality for species
 * †Odynerus terryi – type locality for species
 * †Odynerus wilmattae – type locality for species
 * †Oedipoda
 * †Oedipoda praefocata – type locality for species
 * †Ogygoptynx – type locality for genus
 * †Ogygoptynx wetmorei – type locality for species
 * †Olbiogaster
 * †Olbiogaster simplex – type locality for species
 * †Oligaeschna
 * †Oligaeschna lapidaria – type locality for species
 * †Oligaeschna separata – type locality for species
 * †Oligoaeschna – type locality for genus
 * †Oligoaeschna needhami – type locality for species
 * †Oligobruchus
 * †Oligobruchus florissantensis – type locality for species
 * †Oligobruchus haywardi – type locality for species
 * †Oligobruchus primoticus – type locality for species
 * †Oligobruchus scudderi – type locality for species
 * †Oligobruchus submersus – type locality for species
 * †Oligobruchus wilsoni – type locality for species
 * †Oligocryptus – type locality for genus
 * †Oligocryptus sectus – type locality for species
 * †Oligodonta – type locality for genus
 * †Oligodonta florissantensis – type locality for species
 * Oligomerus.brunneus.-.calwer.29.03.jpg †[[Oligomerus]]
 * †Oligomerus breviusculus – type locality for species
 * †Oligomerus duratus – type locality for species
 * †Oligomerus florissantensis – type locality for species
 * †Oligomyotis
 * †Oligomyotis casementi
 * †Oligoneuroides – type locality for genus
 * †Oligoneuroides destructus – type locality for species
 * †Oligoryctes
 * †Oligoscalops
 * †Oligoscalops galbreathi
 * †Oligotricha
 * †Oligotricha evanescens – type locality for species
 * †Ologlyptus
 * †Ologlyptus primus – type locality for species
 * Olophrum
 * †Olophrum boreale
 * †Olophrum obtectum
 * Omalium
 * †Omalium antiquorum – type locality for species
 * †Omileus
 * †Omileus evanidus – type locality for species
 * †Omomys
 * †Omomys carteri
 * Omus
 * †Omus audouini
 * Muskrat Foraging.JPG [[Ondatra]]
 * †Ondatra annectens
 * †Oodectes
 * †Oodectes herpestoides
 * Ophisaurus
 * Ophryastes
 * †Ophryastes championi
 * †Ophryastes grandis – type locality for species
 * †Ophryastes petrarum
 * †Ophryastites
 * †Ophryastites absconsus – type locality for species
 * †Ophryastites cinereus – type locality for species
 * †Ophryastites dispertitus – type locality for species
 * †Ophryastites hendersoni – type locality for species
 * †Ophryastites miocenus – type locality for species
 * †Ophyra
 * †Ophyra vetusta – type locality for species
 * †Opisthotriton
 * †Opisthotriton kayi – or unidentified comparable form
 * †Orchelimum
 * †Orchelimum placidum – type locality for species
 * Orchestes
 * †Orchestes languidulus – type locality for species
 * Oreamnos – or unidentified comparable form
 * Oreamnos harringtoni.jpg †[[Oreamnos harringtoni]]
 * †Oreolagus
 * †Oreolagus wilsoni – type locality for species
 * †Oreopanax
 * †Oreopanax dissecta
 * †Oreopanax elongatum – type locality for species
 * †Oreotalpa – type locality for genus
 * †Oreotalpa florissantensis – type locality for species
 * †Ormyrodes
 * †Ormyrodes petrefactus – type locality for species
 * †Orohippus
 * †Orohippus sylvaticus
 * †Oromeryx
 * Orontium aquaticum 1 - Buffalo Botanical Gardens.jpg †[[Orontium]]
 * †Orontium fossile
 * †Orphilus
 * †Orphilus dubius
 * †Orthocentrus
 * †Orthocentrus defossus – type locality for species
 * †Orthocentrus primus – type locality for species
 * †Orthriocorisa – type locality for genus
 * †Orthriocorisa longipes – type locality for species
 * †Oryctogma – type locality for genus
 * †Oryctogma sackenii – type locality for species
 * †Oryctorhinus – type locality for genus
 * †Oryctorhinus tenuirostris – type locality for species
 * †Oryctoscirtetes – type locality for genus
 * †Oryctoscirtetes protogaeum – type locality for species
 * †Osmanthus
 * †Osmanthus praemissa
 * OsmundaRegalis.jpg †[[Osmunda]]
 * †Osmunda greenlandica
 * †Osmylidia
 * †Osmylidia requieta – type locality for species
 * †Otiorhynchites
 * †Otiorhynchites absentivus – type locality for species
 * †Otiorhynchites commutatus – type locality for species
 * †Otiorhynchites florissantensis – type locality for species
 * †Otiorhynchites tysoni
 * †Otiorhynchus
 * †Otiorhynchus flaccus – type locality for species
 * †Otiorhynchus subteractus – type locality for species
 * Ovis
 * †Ovis canadensis
 * †Oxyacodon
 * †Oxyacodon archibaldi – type locality for species
 * Oxyaena cropped.png †[[Oxyaena]]
 * †Oxyaena forcipata
 * †Oxyaena gulo
 * †Oxyaena intermedia
 * †Oxyaena lupina – or unidentified comparable form
 * †Oxyaena pardalis – or unidentified comparable form
 * †Oxycera
 * †Oxycera contusa – type locality for species
 * †Oxyclaenus
 * †Oxyclaenus cuspidatus – or unidentified comparable form
 * †Oxyclaenus subbituminus – type locality for species
 * †Oxygonus
 * †Oxygonus primus – type locality for species
 * †Oxyomus
 * †Oxyomus nearcticus – type locality for species
 * †Oxyprimus
 * †Oxyprimus galadrielae – or unidentified comparable form
 * †Oxyserphus
 * †Oxyserphus exhumatus – type locality for species
 * Oxytelus
 * †Oxytelus laqueatus
 * †Oxytelus pristinus – type locality for species
 * †Oxytelus subapterus – type locality for species

P

 * Pachyaena gigantea cropped.jpg †[[Pachyaena]]
 * †Pachyaena ossifraga – tentative report
 * †Pachybaris
 * †Pachybaris rudis – type locality for species
 * †Pachylobius
 * †Pachylobius compressus
 * †Pachylobius depraedatus – type locality for species
 * †Pachysomites – type locality for genus
 * †Pachysomites inermis – type locality for species
 * †Pachysystropus – type locality for genus
 * †Pachysystropus condemnatus – type locality for species
 * †Pachysystropus rohweri – type locality for species
 * †Pactopus
 * †Pactopus americanus – type locality for species
 * Paederus littoralis December 2016-1.jpg †[[Paederus]]
 * †Paederus adumbratus – type locality for species
 * †Paladicella – type locality for genus
 * †Paladicella eruptionis – type locality for species
 * †Palaeictops
 * †Palaeictops bicuspis
 * †Palaeictops multicuspis
 * †Palaeobittacus – type locality for genus
 * †Palaeobittacus eocenicus – type locality for species
 * †Palaeochrysa – type locality for genus
 * †Palaeochrysa concinnula – type locality for species
 * †Palaeochrysa stricta – type locality for species
 * †Palaeochrysa wickhami – type locality for species
 * †Palaeocrex – type locality for genus
 * †Palaeocrex fax – type locality for species
 * †Palaeodrassus
 * †Palaeodrassus cockerelli – type locality for species
 * †Palaeodrassus florissanti – type locality for species
 * †Palaeodrassus hesternus
 * †Palaeodrassus interitus – type locality for species
 * Palaeogale skull lateral Matthew 1902.png †[[Palaeogale]]
 * †Palaeogale sectoria
 * †Palaeogyps – type locality for genus
 * †Palaeogyps prodromus – type locality for species
 * †Palaeolagus
 * †Palaeolagus burkei – type locality for species
 * †Palaeolagus haydeni
 * †Palaeolagus intermedius
 * †Palaeometa
 * †Palaeometa opertanea – type locality for species
 * †Palaeonanophyes – type locality for genus
 * †Palaeonanophyes zherikhini – type locality for species
 * Palaeonictis.jpg †[[Palaeonictis]]
 * †Palaeonictis occidentalis
 * †Palaeopachygnatha – type locality for genus
 * †Palaeopachygnatha cockerelli – type locality for species
 * †Palaeopachygnatha scudderi – type locality for species
 * †Palaeopherocera
 * †Palaeopherocera scudderi – type locality for species
 * †Palaeoplatyura
 * †Palaeoplatyura eocenica – type locality for species
 * †Palaeopotamogeton
 * †Palaeopotamogeton florissanti
 * †Palaeorehnia – type locality for genus
 * †Palaeorehnia maculata – type locality for species
 * †Palaeoscincosaurus – type locality for genus
 * †Palaeoscincosaurus middletoni – type locality for species
 * †Palaeosinopa
 * †Palaeosinopa incerta
 * †Palaeosmodicum – type locality for genus
 * †Palaeosmodicum hamiltoni – type locality for species
 * †Palaeospiza
 * †Palaeospiza bella
 * Palaeosyops leidyi.JPG †[[Palaeosyops]] – type locality for genus
 * †Palaeosyops fontinalis – type locality for species
 * †Palaeotaxonus – type locality for genus
 * †Palaeotaxonus trivittatus – type locality for species
 * †Palaeotaxonus typicus – type locality for species
 * †Palaeotaxonus vetus – type locality for species
 * †Palaeoteleia – type locality for genus
 * †Palaeoteleia oxyura – type locality for species
 * †Palaeotorymus
 * †Palaeotorymus aciculatus – type locality for species
 * †Palaeotorymus laevis – type locality for species
 * †Palaeotorymus striatus – type locality for species
 * †Palaeotorymus typicus – type locality for species
 * †Palaeovelia – type locality for genus
 * †Palaeovelia spinosa – type locality for species
 * Palaeovespa florissantia cropped.jpg †[[Palaeovespa]] – type locality for genus
 * †Palaeovespa florissantia – type locality for species
 * †Palaeovespa gillettei – type locality for species
 * †Palaeovespa relecta – type locality for species
 * †Palaeovespa scudderi – type locality for species
 * †Palaeovespa wilsoni – type locality for species
 * †Palaphrodes – type locality for genus
 * †Palaphrodes cincta – type locality for species
 * †Palaphrodes irregularis – type locality for species
 * †Palaphrodes obliqua – type locality for species
 * †Palaphrodes obscura – type locality for species
 * †Palaphrodes transversa – type locality for species
 * †Palatobaena
 * †Palatobaena bairdi
 * †Palecphora – type locality for genus
 * †Palecphora communis – type locality for species
 * †Palecphora inornata – type locality for species
 * †Palecphora maculata – type locality for species
 * †Palecphora marvinei – type locality for species
 * †Palecphora praevalens – type locality for species
 * †Paleocarcinophora
 * †Paleocarcinophora lithophila – type locality for species
 * †Paleoclinolabus
 * †Paleoclinolabus dormitus – type locality for species
 * †Palmites
 * †Palmocarpon
 * †Palmocarpon commune
 * †Palmocarpon compositum
 * †Palmocarpon lineatum
 * †Palmocarpon subcylindricum
 * †Palmocarpon truncatum
 * †Paloedemera – type locality for genus
 * †Paloedemera crassipes – type locality for species
 * †Paloreodoxites
 * †Paloreodoxites plicatus
 * †Paltorhynchus
 * †Paltorhynchus bisulcatus – type locality for species
 * †Paltorhynchus depratus
 * †Paltorhynchus narwhal
 * †Paltorhynchus rectirostris – type locality for species
 * †Paltorhynchus sedatus – type locality for species
 * †Panax
 * †Panax andrewsii
 * †Pandeleteinus
 * †Pandeleteinus nudus – type locality for species
 * Panorpa communis VI.jpg †[[Panorpa]]
 * †Panorpa arctiiformis – type locality for species
 * †Panorpa rigida – type locality for species
 * †Pantoclis
 * †Pantoclis deperdita – type locality for species
 * †Pantolestes
 * †Pantolestes natans
 * †Paracarpinus
 * †Paracarpinus fraterna
 * Paracosmus – type locality for genus
 * †Paracosmus antiquus – type locality for species
 * †Paracosmus coquilletti – type locality for species
 * †Paracosmus palpalis – type locality for species
 * †Paracosmus recurrens – type locality for species
 * †Paracosoryx
 * †Paracynarctus
 * †Paracynarctus kelloggi
 * †Paradjidaumo
 * †Paradjidaumo trilophus
 * †Paraglyptosaurus
 * †Paraglyptosaurus princeps – type locality for species
 * †Parahippus
 * †Parahippus leonensis – or unidentified comparable form
 * †Parahippus pawniensis – type locality for species
 * †Parajulus
 * †Parajulus cockerelli – type locality for species
 * San Diego Paramylodon.jpg Paramylodon]] †Paramylodon
 * †Paramylodon harlani
 * †Paramys
 * †Paramys copei
 * †Paramys excavatus
 * †Paramys relictus
 * †Paramys taurus
 * †Parandra
 * †Parandra florissantensis – type locality for species
 * †Parattus – type locality for genus
 * †Parattus evocatus – type locality for species
 * †Parattus latitatus – type locality for species
 * †Parattus oculatus – type locality for species
 * †Parattus resurrectus – type locality for species
 * Paratylopus.jpeg   †[[Paratylopus]]
 * †Paratylopus labiatus
 * †Parectypodus
 * †Parectypodus lunatus
 * †Parictis
 * †Parictis dakotensis
 * †Parodarmistus – type locality for genus
 * †Parodarmistus abscissus – type locality for species
 * †Parodarmistus caducus – type locality for species
 * †Parodarmistus collisus – type locality for species
 * †Parodarmistus defectus – type locality for species
 * †Parodarmistus exanimatus – type locality for species
 * †Parodarmistus inhibitus – type locality for species
 * †Parolamia – type locality for genus
 * †Parolamia rudis – type locality for species
 * †Parophisaurus – type locality for genus
 * †Parophisaurus pawneensis – type locality for species
 * †Parotermes – type locality for genus
 * †Parotermes insignis – type locality for species
 * †Parthenocissus
 * †Parthenocissus osbornii
 * †Parvericius
 * †Parvericius montanus
 * †Passaloecus
 * †Passaloecus fasciatus – type locality for species
 * †Passaloecus scudderi – type locality for species
 * Knight Patriofelis.jpg †[[Patriofelis]]
 * †Patriofelis ulta
 * †Paussopsis – type locality for genus
 * †Paussopsis nearctica – type locality for species
 * †Paussopsis secunda – type locality for species
 * Pediacus
 * †Pediacus periclitans – type locality for species
 * Pekania
 * †Pekania diluviana
 * †Pelandrena – type locality for genus
 * †Pelandrena reducta – type locality for species
 * †Pellea
 * †Pellea antiquella
 * †Peltis
 * †Peltis laminata – type locality for species
 * Peltosaurus.JPG †[[Peltosaurus]]
 * †Peltosaurus granulosus – type locality for species
 * †Pelycodus
 * †Pelycodus danielsae
 * †Pelycodus jarrovii
 * †Pelycomys
 * †Pelycomys placidus
 * †Pelycomys rugosus
 * †Penetrigonias
 * †Penetrigonias dakotensis
 * †Penosphyllum
 * †Penosphyllum cordatum
 * †Pentatomites – type locality for genus
 * †Pentatomites foliarum – type locality for species
 * Macropelopia.nebulosa.jpg [[Penthetria]] – type locality for genus
 * †Penthetria creedensis – type locality for species
 * †Penthetria immutabilis – type locality for species
 * †Penthetria intermedia – type locality for species
 * †Penthetria longifurca – type locality for species
 * †Pepsis
 * †Pepsis avitula – type locality for species
 * †Peraceras
 * †Peraceras profectum
 * †Peraceras superciliosum
 * †Peradectes
 * †Peradectes elegans – type locality for species
 * †Peradectes protinnominatus – type locality for species
 * Peratherium cropped.png †[[Peratherium]]
 * †Peratherium comstocki – or unidentified comparable form
 * †Perchoerus
 * †Perchoerus nanus
 * †Periptychus
 * †Periptychus coarctatus
 * Peromyscus
 * †Peromyscus cragini
 * †Peromyscus maniculatus
 * †Peromyscus progressus
 * Persea
 * †Persea brossiana
 * †Persea florissantia – type locality for species
 * Carpenter 1930-75 Petraeomyrmex minimus.jpg †[[Petraeomyrmex]] – type locality for genus
 * †Petraeomyrmex minimus – type locality for species
 * †Petrolabis
 * †Petrolabis gurneyi – type locality for species
 * †Petrolestes – type locality for genus
 * †Petrolestes hendersoni – type locality for species
 * †Petrolystra – type locality for genus
 * †Petrolystra gigantea – type locality for species
 * †Petrolystra heros – type locality for species
 * †Petrunkevitchiana
 * †Petrunkevitchiana oculata – type locality for species
 * †Phaca
 * †Phaca wilmattae
 * Phalacrocorax
 * †Phalacrocorax mediterraneus
 * Phalaropus
 * †Phalaropus lobatus
 * †Phaseolites
 * †Phaseolites dedal – type locality for species
 * †Phasmagyps – type locality for genus
 * †Phasmagyps patritus – type locality for species
 * Pheidole
 * †Pheidole tertiaria – type locality for species
 * †Phenacodaptes
 * †Phenacodaptes sabulosus
 * Knight Phenacodus.jpg †[[Phenacodus]]
 * †Phenacodus grangeri
 * †Phenacodus intermedius
 * †Phenacodus magnus
 * †Phenacodus vortmani
 * †Phenacolestes – type locality for genus
 * †Phenacolestes mirandus – type locality for species
 * †Phenacolestes parallelus – type locality for species
 * Phenacomys
 * †Phenacomys deeringensis
 * †Phenacomys gryci – or unidentified comparable form
 * †Phenacomys intermedius
 * †Phenacoperga
 * †Phenacoperga coloradensis – type locality for species
 * †Phenacopsyche – type locality for genus
 * †Phenacopsyche larvalis – type locality for species
 * †Phenacopsyche vexans – type locality for species
 * †Phenanthera
 * †Phenanthera petalifera
 * Philadelphus Belle Étoile1a.UME.jpg [[Philadelphus]]
 * †Philadelphus minutus – type locality for species
 * †Philanthus
 * †Philanthus saxigenus – type locality for species
 * Philhydrus
 * †Philhydrus scudderi
 * †Philonicus
 * †Philonicus saxorum – type locality for species
 * Philonthus
 * †Philonthus abavus
 * †Philonthus horni – type locality for species
 * †Philonthus invelatus – type locality for species
 * †Philonthus marcidulus – type locality for species
 * †Philoponites
 * †Philoponites praefractus – type locality for species
 * †Philorites – type locality for genus
 * †Philorites johannseni – type locality for species
 * †Philorites pallescens – type locality for species
 * Phlaocyon.png †[[Phlaocyon]]
 * †Phlaocyon leucosteus – type locality for species
 * †Phloeonemites – type locality for genus
 * †Phloeonemites miocenus – type locality for species
 * Phloeosinus
 * †Phloeosinus scopulorum
 * Phloeotribus
 * †Phloeotribus zimmermanni – type locality for species
 * †Phora
 * †Phora tumbae – type locality for species
 * †Phrudopamera – type locality for genus
 * †Phrudopamera chittendeni – type locality for species
 * †Phrudopamera wilsoni – type locality for species
 * Phryganea
 * †Phryganea labefacta – type locality for species
 * †Phryganea miocenica – type locality for species
 * †Phryganea wickhami – type locality for species
 * Phrynosoma douglasii 4179.JPG, or pygmy short-horned lizard]] Phrynosoma''
 * †Phrynosoma douglassi
 * †Phthinocoris – type locality for genus
 * †Phthinocoris colligatus – type locality for species
 * †Phthinocoris languidus – type locality for species
 * †Phthinocoris lethargicus – type locality for species
 * †Phthinocoris petraeus – type locality for species
 * †Phylledestes – type locality for genus
 * †Phylledestes vorax – type locality for species
 * †Phyllites
 * †Phyllites pagosensis
 * †Phyllobaenus
 * †Phyllobaenus wolcotti – type locality for species
 * Phyllobius
 * †Phyllobius antecessor – type locality for species
 * Phyllophaga spPCCP20040419-4076A2.jpg †[[Phyllophaga]]
 * †Phyllophaga avus
 * †Phyllophaga disrupta – type locality for species
 * †Phyllophaga extincta – type locality for species
 * †Phymatodes
 * †Phymatodes grandaevus – type locality for species
 * †Phymatodes miocenicus – type locality for species
 * †Phymatodes volans – type locality for species
 * Pica
 * †Pica hudsonia
 * Picea
 * †Picea lahontense
 * †Picea magna – type locality for species
 * †Picea pinifructus
 * Picoides
 * †Picoides villosus
 * †Pidonia
 * †Pidonia ingenua – type locality for species
 * †Pidonia leidyi – type locality for species
 * †Piesma – tentative report
 * †Piesma rotunda – type locality for species
 * †Piezocoris – type locality for genus
 * †Piezocoris compactilis – type locality for species
 * †Piezocoris peremptus – type locality for species
 * †Piezocoris peritus – type locality for species
 * Ichneumonidae - Pimpla cf. rufipes.jpg †[[Pimpla]]
 * †Pimpla appendigera – type locality for species
 * †Pimpla eocenica – type locality for species
 * †Pimpla morticina – type locality for species
 * †Pimpla rediviva – type locality for species
 * †Pimpla revelata – type locality for species
 * †Pimpla senilis – type locality for species
 * Pinus
 * †Pinus florissanti
 * †Pinus hambachi
 * †Pinus wheeleri
 * †Pipiza
 * †Pipiza melanderi – type locality for species
 * †Pison
 * †Pison cockerellae – type locality for species
 * Pituophis
 * Suwanee County FL Pine Snake.jpg †[[Pituophis melanoleucus]]
 * Pityophthorus
 * †Pityophthorus opaculus
 * †Plagiopodiopsis
 * †Plagiopodiopsis cockerelliae
 * †Plagiopodiopsis scudderi
 * †Planocephalus – type locality for genus
 * †Planocephalus aselloides – type locality for species
 * Planolinoides
 * †Planolinoides duplex
 * †Plastomenus – tentative report
 * †Plastomenus lachrymalis
 * †Platanites
 * †Platanites marginata
 * Plataan bladeren.jpg [[Platanus]]
 * †Platanus florissanti – type locality for species
 * †Platanus nobilis
 * †Platanus raynoldsi
 * †Platanus raynoldsii
 * †Platanus wyomingensis
 * Plateumaris
 * †Plateumaris flavipes
 * †Plateumaris germari
 * †Plateumaris primaeva – type locality for species
 * †Plateumaris pusilla
 * †Platycheirus
 * †Platycheirus lethaeus – type locality for species
 * †Platycheirus persistens – type locality for species
 * Platydema
 * †Platydema antiquorum – type locality for species
 * †Platydema bethunei – type locality for species
 * †Platydracus
 * †Platydracus breviantennatus – type locality for species
 * Platygonus leptorhinus cropped.png of the genus Platygonus. Charles R. Knight (1922).]] †Platygonus
 * †Platygonus pollenae
 * Platynus
 * †Platynus florissantensis – type locality for species
 * †Platynus insculptipennis – type locality for species
 * †Platynus tartareus – type locality for species
 * †Platypedia
 * †Platypedia primigenia – type locality for species
 * †Platyphylax
 * †Platyphylax florissantensis – type locality for species
 * Platystethus
 * †Platystethus archetypus – type locality for species
 * †Platystethus carcareus – type locality for species
 * Plecia ruficollis op Setaria megaphylla, Manie vd Schijff BT, e.jpg [[Plecia]]
 * †Plecia akerionana
 * †Plecia axeliana – type locality for species
 * †Plecia decapitata – type locality for species
 * †Plecia explanata – type locality for species
 * †Plecia gradata – type locality for species
 * †Plecia melanderi – type locality for species
 * †Plecia orycta – type locality for species
 * †Plecia rhodopterina – type locality for species
 * †Plecia tessella – type locality for species
 * †Plecia winchesteri – type locality for species
 * †Plectiscidea
 * †Plectiscidea lanhami – type locality for species
 * †Plectrotetrophanes – type locality for genus
 * †Plectrotetrophanes hageni – type locality for species
 * †Plesiadapis
 * †Plesiadapis dubius
 * †Plesiadapis fodinatus
 * †Plesiobaena
 * †Plesiobaena antiqua – or unidentified comparable form
 * †Plesiosorex
 * †Plesiosorex coloradensis – type locality for species
 * †Pleurolicus
 * Pliohippus Pernix.jpg †[[Pliohippus]]
 * †Pliohippus mirabilis – type locality for species
 * †Plionictis
 * †Plionictis ogygia
 * †Plochionus
 * †Plochionus lesquereuxi – type locality for species
 * †Poabromylus
 * Podabrus
 * †Podabrus cupesoides – type locality for species
 * †Podabrus florissantensis – type locality for species
 * †Podabrus fragmentatus – type locality for species
 * †Podabrus wheeleri – type locality for species
 * Podiceps
 * Podilymbus
 * †Podilymbus podiceps
 * Poebrotherium.jpg †[[Poebrotherium]]
 * †Poebrotherium eximium
 * †Poebrotherium wilsoni
 * †Poecilocapsus
 * †Poecilocapsus fremontii – type locality for species
 * †Poecilocapsus ostentus – type locality for species
 * †Poecilocapsus tabidus – type locality for species
 * †Poecilocapsus veterandus – type locality for species
 * †Poecilocapsus veternosus – type locality for species
 * †Poecilognathus – type locality for genus
 * †Poecilognathus stigmalis – type locality for species
 * †Pogonomyrmex
 * †Pogonomyrmex fossilis – type locality for species
 * †Polemius
 * †Polemius crassicornis – type locality for species
 * †Poliocoris – type locality for genus
 * †Poliocoris amnesis – type locality for species
 * †Polioschistus – type locality for genus
 * †Polioschistus lapidarius – type locality for species
 * †Polioschistus ligatus – type locality for species
 * †Poliosphageus – type locality for genus
 * †Poliosphageus psychrus – type locality for species
 * Polycentropus
 * †Polycentropus aeternus – type locality for species
 * †Polycentropus eviratus – type locality for species
 * †Polycentropus exesus – type locality for species
 * Polygraphus
 * †Polygraphus rufipennis
 * †Polygraphus wortheni – type locality for species
 * †Polysphincta
 * †Polysphincta inundata – type locality for species
 * †Polysphincta mortuaria – type locality for species
 * †Polysphincta petrorum – type locality for species
 * †Polystoechotites
 * †Polystoechotites piperatus – type locality for species
 * †Ponerites – type locality for genus
 * †Ponerites coloradensis – type locality for species
 * †Ponerites eocenicus – type locality for species
 * †Ponerites hypoponeroides – type locality for species
 * †Populites
 * †Populites heeri
 * Populus
 * †Populus cinnamomoides
 * †Populus crassa
 * †Populus pyrifolia
 * †Populus wilmattae
 * †Porizon
 * †Porizon exsectus – type locality for species
 * Porzana
 * Sora (Porzana carolina).jpg †[[Porzana carolina]]
 * †Potamogeton
 * †Potamogeton geniculatus
 * †Potamogeton verticillatus
 * †Poteschistus – type locality for genus
 * †Poteschistus obnubilus – type locality for species
 * †Praepapilio – type locality for genus
 * †Praepapilio colorado – type locality for species
 * †Praepapilio gracilis – type locality for species
 * †Priabona
 * †Priabona florissantius – type locality for species
 * †Prinecphora – type locality for genus
 * †Prinecphora balteata – type locality for species
 * †Pristaulacus – type locality for genus
 * †Pristaulacus rohweri – type locality for species
 * †Pristaulacus secundus – type locality for species
 * †Pristichampsus
 * †Proapemon – type locality for genus
 * †Proapemon infernus – type locality for species
 * †Probathyopsis
 * †Probathyopsis harrisorum – type locality for species
 * †Procas
 * †Procas verberatus – type locality for species
 * †Procas vinculatus
 * †Procerberus
 * †Procerberus andesiticus – type locality for species
 * †Procerberus grandis – type locality for species
 * †Prochaetocnema – type locality for genus
 * †Prochaetocnema florissantella – type locality for species
 * †Procoris – type locality for genus
 * †Procoris bechleri – type locality for species
 * †Procoris sanctaejohannis – type locality for species
 * †Procrophius – type locality for genus
 * †Procrophius communis – type locality for species
 * †Procrophius costalis – type locality for species
 * †Procrophius languens – type locality for species
 * †Proctotrypes
 * †Proctotrypes exhumatus – type locality for species
 * †Procydnus – type locality for genus
 * †Procydnus devictus – type locality for species
 * †Procydnus divexus – type locality for species
 * †Procydnus eatoni – type locality for species
 * †Procydnus mamillanus
 * †Procydnus pronus – type locality for species
 * †Procydnus quietus – type locality for species
 * †Procydnus reliquus – type locality for species
 * †Procydnus vesperus – type locality for species
 * †Procymus – type locality for genus
 * †Procymus cockerelli – type locality for species
 * †Prodeporaides
 * †Prodeporaides laminarum – type locality for species
 * †Prodeporaides subterraneus – type locality for species
 * †Prodeporaides vulcan – type locality for species
 * †Prodeporaides wymani – type locality for species
 * †Prodeporaus
 * †Prodeporaus curiosum – type locality for species
 * †Prodeporaus exanimale – type locality for species
 * †Prodeporaus exilis – type locality for species
 * †Prodeporaus minutissimus – type locality for species
 * †Prodeporaus smithii – type locality for species
 * †Prodiacodon
 * †Prodiacodon tauricinerei
 * †Prodipodomys
 * †Prodipodomys centralis
 * Prodryas.png †[[Prodryas]] – type locality for genus
 * †Prodryas persephone – type locality for species
 * †Proelectrotermes
 * †Proelectrotermes fodinae – type locality for species
 * †Progloma – type locality for genus
 * †Progloma rohweri – type locality for species
 * †Proheteromys
 * †Proheteromys sulculus
 * †Proiridomyrmex – type locality for genus
 * †Proiridomyrmex vetulus – type locality for species
 * †Prokalotermes
 * †Prokalotermes hagenii – type locality for species
 * †Prolibythea – type locality for genus
 * †Prolibythea florissanti – type locality for species
 * †Prolibythea vagabunda – type locality for species
 * †Prolimnocyon
 * †Prolimnocyon atavus
 * †Prolimnocyon haematus
 * †Prolygaeus – type locality for genus
 * †Prolygaeus inundatus – type locality for species
 * †Promioclaenus
 * †Promioclaenus acolytus
 * †Pronemobius
 * †Pronemobius ornatipes – type locality for species
 * †Pronemobius tertiarius – tentative report
 * †Propalaeanodon
 * †Prophilanthus – type locality for genus
 * †Prophilanthus destructus – type locality for species
 * †Proscalops
 * †Proscalops miocaenus – type locality for species
 * †Proscalops secundus – or unidentified comparable form
 * †Prosigara – type locality for genus
 * †Prosigara flabellum – type locality for species
 * †Prosoeca – type locality for genus
 * †Prosoeca florigera – type locality for species
 * Prosopis
 * †Prosopis linearfolia
 * †Protacnaeus – type locality for genus
 * †Protacnaeus tenuicornis – type locality for species
 * †Protapate – type locality for genus
 * †Protapate contorta – type locality for species
 * Bmnhp27347 p 1 high.jpg †[[Protazteca]] – type locality for genus
 * †Protazteca capitata – type locality for species
 * †Protazteca elongata – type locality for species
 * †Protazteca hendersoni – type locality for species
 * †Protazteca quadrata – type locality for species
 * †Proteleates – type locality for genus
 * †Proteleates centralis – type locality for species
 * †Protenor
 * †Protenor imbecillis – type locality for species
 * †Protictis
 * †Protictis proteus
 * †Protipochus – type locality for genus
 * †Protipochus vandykei – type locality for species
 * †Protochrysotoxum – type locality for genus
 * †Protochrysotoxum sphinx – type locality for species
 * †Protoedalea
 * †Protoedalea brachystoma – type locality for species
 * Protohippus simus.jpg †[[Protohippus]]
 * †Protoibalia
 * †Protoibalia connexiva – type locality for species
 * †Protolabis
 * †Protolabis heterodontus
 * †Protoliarus – type locality for genus
 * †Protoliarus amabilis – type locality for species
 * †Protoliarus humatus – type locality for species
 * †Protomarctus
 * †Protomarctus optatus
 * †Protomelecta – type locality for genus
 * †Protomelecta brevipennis – type locality for species
 * †Protoncideres – type locality for genus
 * †Protoncideres primus – type locality for species
 * †Protoplatycera – type locality for genus
 * †Protoplatycera laticornis – type locality for species
 * †Protoreodon
 * F John Series 2 Protorohippus card 5 cropped.jpg †[[Protorohippus]]
 * †Protorohippus venticolum
 * †Protospermophilus
 * †Protospermophilus kelloggi
 * †Protostephanus – type locality for genus
 * †Protostephanus ashmeadi – type locality for species
 * †Prototomus
 * †Prototomus deimos
 * †Prototomus martis
 * †Prototomus phobos
 * †Prototomus secundarius
 * †Protungulatum
 * †Protungulatum donnae
 * Prunus
 * †Prunus coloradensis
 * †Prunus corrugis
 * †Prunus gracilis
 * †Psammaecius
 * †Psammaecius sepultus – type locality for species
 * †Psapharochus
 * †Psapharochus lengii – type locality for species
 * †Psephenus
 * †Psephenus lutulentus – type locality for species
 * Pseudacris
 * †Pseudacris triseriata
 * Pseudaelurus cropped.png †[[Pseudaelurus]]
 * †Pseudaelurus stouti
 * †Pseudhipparion
 * †Pseudocimbex – type locality for genus
 * †Pseudocimbex clavatus – type locality for species
 * †Pseudocylindrodon
 * †Pseudocylindrodon neglectus – or unidentified comparable form
 * †Pseudomesauletes
 * †Pseudomesauletes culex – type locality for species
 * †Pseudomesauletes ibis – type locality for species
 * †Pseudomesauletes obliquus – type locality for species
 * †Pseudomesauletes striaticeps – type locality for species
 * Pseudomyrmex
 * †Pseudomyrmex extinctus – type locality for species
 * Pseudoprotoceras fossil.jpg †[[Pseudoprotoceras]]
 * †Pseudoprotoceras longinaris
 * †Pseudosiobla
 * †Pseudosiobla megoura – type locality for species
 * †Pseudosiobla misera – type locality for species
 * †Pseudosmylidia – type locality for genus
 * †Pseudosmylidia relicta – type locality for species
 * †Pseudotetonius
 * †Pseudotetonius ambiguus
 * †Pseudotheridomys
 * †Pseudotheridomys hesperus
 * †Pseudotrimylus
 * †Pseudotrimylus compressus
 * †Pseudotrimylus roperi
 * Psittacotherium multifragumDB24.jpg]] †Psittacotherium''
 * Ptelea
 * †Ptelea cassiodes
 * Pterocarya
 * †Pterocarya hispida
 * †Pterocarya roanensis – type locality for species
 * †Pterogaulus
 * †Pterogaulus laevis
 * †Pteromalus
 * †Pteromalus exanimis – type locality for species
 * †Pteromogoplistes
 * †Pteromogoplistes grandis – type locality for species
 * †Pteromogoplistes smithii – tentative report
 * †Pteronus
 * †Pteronus prodigus – type locality for species
 * Pterostichus
 * †Pterostichus pumpellyi – type locality for species
 * †Pterostichus walcotti
 * †Pterotriamescaptor – tentative report
 * †Pterotriamescaptor americanus – type locality for species
 * Ptilodus skull BW cropped.jpg   †[[Ptilodus]]
 * †Ptilodus kummae
 * †Ptosima
 * †Ptosima abyssa – type locality for species
 * †Ptosima schaefferi – type locality for species
 * †Ptosima silvatica – type locality for species
 * †Ptychoptera
 * †Ptychoptera miocenica – type locality for species
 * †Pulverflumen
 * Pycnoglypta
 * †Pycnoglypta lurida
 * †Pythoceropsis – type locality for genus
 * †Pythoceropsis singularis – type locality for species

Q

 * †Quadratomus
 * †Quadratomus grandis
 * Quedius
 * †Quedius breweri – type locality for species
 * †Quedius chamberlini – type locality for species
 * †Quedius mortuus – type locality for species
 * Eiche bei Schönderling, 2.jpg [[Quercus]]
 * †Quercus balaninorum
 * †Quercus dumosoides
 * †Quercus greenlandica
 * †Quercus knowltoniana
 * †Quercus lyratiformis
 * †Quercus mohavensis
 * †Quercus orbata
 * †Quercus perdayana – type locality for species
 * †Quercus peritula
 * †Quercus schottii
 * †Quercus scottii
 * †Quercus scudderi
 * †Quercus sullyi

R

 * Rallus
 * †Rallus limicola
 * Merycodus osborni cropped.png †[[Ramoceros]]
 * †Ramoceros osborni
 * †Rana
 * †Rana catesbeiana
 * †Raphidia
 * †Raphidia creedei – type locality for species
 * †Reichertella
 * †Reichertella fasciata – type locality for species
 * Reithrodontomys
 * †Reithroparamys
 * †Reithroparamys debequensis – type locality for species
 * †Rembus – tentative report
 * †Rembus henshawi – type locality for species
 * Reticulitermes
 * †Reticulitermes creedei – type locality for species
 * †Reticulitermes fossarum – type locality for species
 * Rhabdomastix
 * †Rhabdomastix frigida – type locality for species
 * †Rhabdomastix labefactata – type locality for species
 * †Rhabdomastix praecursor – type locality for species
 * †Rhabdomastix primogenitalis
 * †Rhabdomastix profundi – type locality for species
 * †Rhabdomastix scudderi – type locality for species
 * †Rhadinobrochus
 * †Rhadinobrochus extinctus – type locality for species
 * Rhagio.lineola.-.lindsey.jpg †[[Rhagio]]
 * †Rhagio fossitius – type locality for species
 * †Rhagio wheeleri – type locality for species
 * †Rhagoderidea – type locality for genus
 * †Rhagoderidea striata – type locality for species
 * Rhagonycha
 * †Rhagonycha hesperus – type locality for species
 * †Rhamnites
 * †Rhamnites pseudostenophyllus
 * †Rhamnus
 * †Rhamnus cleburni
 * †Rhamnus goldiana
 * Rhamphomyia.marginata.female.jpg †[[Rhamphomyia]]
 * †Rhamphomyia aeterna – type locality for species
 * †Rhamphomyia craterae – type locality for species
 * †Rhamphomyia enena – type locality for species
 * †Rhamphomyia fossa – type locality for species
 * †Rhamphomyia hypolitha – type locality for species
 * †Rhamphomyia inanimata – type locality for species
 * †Rhamphomyia infernalis – type locality for species
 * †Rhamphomyia interita – type locality for species
 * †Rhamphomyia morticina – type locality for species
 * †Rhamphomyia senecta – type locality for species
 * †Rhamphomyia sepulta – type locality for species
 * †Rhamphomyia spodites – type locality for species
 * †Rhamphomyia tumulata – type locality for species
 * †Rhepocoris – type locality for genus
 * †Rhepocoris macrescens – type locality for species
 * †Rhepocoris minima – type locality for species
 * †Rhepocoris praetectus – type locality for species
 * †Rhepocoris praevalens – type locality for species
 * †Rhepocoris propinquans – type locality for species
 * Rhineastes
 * †Rhineastes peltatus
 * †Rhineastes smithi
 * Amphisbaenia 1.jpg, or North American worm lizard]] Rhineura''
 * †Rhineura hatcheri
 * †Rhineura hatcherii – type locality for species
 * †Rhingia
 * †Rhingia zephyrea – type locality for species
 * †Rhingiopsis
 * †Rhingiopsis prisculus – type locality for species
 * Rhizophagus
 * †Rhizophagus remotus
 * [[file:Rhus nigricans (fossil leaf) (Green River Formation, Eocene; Utah, USA) 1 (43464239600).jpg|thumb|right|upright|A [[Rhus nigricans]] leaf]] Rhus
 * †Rhus lesquereuxi
 * †Rhus migricans
 * †Rhus nigricans
 * †Rhus obscura
 * †Rhus stellariaefolia
 * †Rhyparochromus
 * †Rhyparochromus verrillii – type locality for species
 * †Rhysosternum
 * †Rhysosternum aeternabile – type locality for species
 * †Rhysosternum longirostre – type locality for species
 * †Rhyssa
 * †Rhyssa petiolata – type locality for species
 * †Rhyssomatus
 * †Rhyssomatus tabescens – type locality for species
 * †Ribes
 * †Ribes errans – type locality for species
 * †Riodinella – type locality for genus
 * †Riodinella nympha – type locality for species
 * †Robinia
 * †Robinia lesquereuxi
 * †Robinia wardi
 * †Rogas
 * †Rogas tertiarius – type locality for species
 * Rosa
 * †Rosa hilliae
 * Rothschildia jacobaea01.jpg †[[Rothschildia]]
 * †Rothschildia fossilis – type locality for species
 * Rubus
 * †Rubus coloradensis
 * †Runaria – type locality for genus
 * †Runaria ostenta – type locality for species
 * †Rupiforficula
 * †Rupiforficula inferna – type locality for species
 * †Rupiforficula labens – type locality for species
 * †Rupiforficula scudderi – type locality for species

S

 * SabalPalm.jpg [[Sabal]]
 * †Sabal grayana
 * †Sabal imperialis
 * †Saccoloma
 * †Saccoloma gardneri
 * †Sackenia – type locality for genus
 * †Sackenia arcuata – type locality for species
 * Salix
 * †Salix coloradensis
 * †Salix coloradica – type locality for species
 * †Salix libbeyi
 * †Salix longiacuminata
 * †Salix longipetiolatum – or unidentified comparable form
 * †Salix ramaleyi
 * †Salix taxifolioides
 * †Sambucus
 * †Sambucus newtoni
 * Saniwa ensidens.jpg †[[Saniwa]]
 * †Saperda
 * †Saperda caroli – type locality for species
 * †Saperda florissantensis – type locality for species
 * †Saperdirhynchus – type locality for genus
 * †Saperdirhynchus priscotitillator – type locality for species
 * †Sapindus
 * †Sapindus coloradensis
 * †Sapromyza
 * †Sapromyza veterana – type locality for species
 * †Saropogon
 * †Saropogon oblitescens – type locality for species
 * Sassafras
 * †Sassafras CR010 informal
 * Sassafras hesperia 01.jpg †[[Sassafras hesperia]]
 * †Sassafras thermale
 * †Scalopoides
 * †Scalopoides isodens
 * Scaphinotus
 * †Scaphinotus serus – type locality for species
 * †Scaptolenopsis – type locality for genus
 * †Scaptolenopsis wilmattae – type locality for species
 * Sceloporus
 * †Sceloporus undulatus
 * †Scenopagus
 * †Scenopagus edenensis
 * †Scenopagus priscus
 * †Schaubeumys
 * †Schaubeumys clivosus
 * †Schaubeumys galbreathi
 * †Schmaltzia
 * †Schmaltzia vexans
 * †Sciabregma – type locality for genus
 * †Sciabregma rugosa – type locality for species
 * †Sciabregma tenuicornis – type locality for species
 * Sciara
 * †Sciara dormitans – type locality for species
 * †Sciara florissantensis – type locality for species
 * †Sciara requieta – type locality for species
 * †Sciara sopora – type locality for species
 * Sciomyza
 * †Sciomyza florissantensis – type locality for species
 * †Sciomyza manca
 * †Sciophila
 * †Sciophila mirandula – type locality for species
 * †Sciuravus
 * Eastern Gray Squirrel 800.jpg [[Sciurus]]
 * Scolytus
 * †Scolytus piceae
 * †Scoparidea – type locality for genus
 * †Scoparidea nebulosa – type locality for species
 * †Scottimus
 * †Scottimus ambiguus
 * †Scyphophorus
 * †Scyphophorus fossionis – type locality for species
 * †Scyphophorus laevis – type locality for species
 * †Scyphophorus tertiarius – type locality for species
 * †Scythropus
 * †Scythropus somniculosus – type locality for species
 * †Segestria
 * †Segestria scudderi – type locality for species
 * †Segestria secessa
 * Selaginella-sp.jpg †[[Selaginella]]
 * †Selaginella berthoudi
 * †Selandria
 * †Selandria sapindi – type locality for species
 * †Semanotus
 * †Semanotus puncticollis – type locality for species
 * †Senoprosopis
 * †Senoprosopis antiquus – type locality for species
 * †Senoprosopis borealis – type locality for species
 * †Senoprosopis eureka – type locality for species
 * †Senoprosopis romeri – type locality for species
 * Sequoia
 * Sequoia affinis SR 95-07-06 01.jpg †[[Sequoia affinis]]
 * Serica
 * †Serica antediluviana – type locality for species
 * †Serica cockerelli – type locality for species
 * †Sespia
 * †Sespia nitida
 * †Setodes
 * †Setodes abbreviata – type locality for species
 * †Setodes portionalis – type locality for species
 * †Sialia
 * †Sibinia
 * †Sibinia whitneyi – type locality for species
 * †Sifrhippus
 * †Sifrhippus grangeri
 * †Sigaretta
 * †Sigaretta florissantella – type locality for species
 * Sigmodon
 * †Sigmodon curtisi
 * †Sigmodon minor
 * †Silpha
 * †Silpha beutenmuelleri – type locality for species
 * †Silpha colorata – type locality for species
 * †Silvius
 * †Silvius merychippi – type locality for species
 * Simplocaria
 * †Simplocaria tessellata
 * †Simpsonlemur
 * †Simpsonlemur jepseni
 * †Simpsonodus
 * †Simpsonodus chacensis
 * †Sinclairella
 * †Sinclairella dakotensis
 * Sinonyx jiashanensis cropped.png †[[Sinonyx]] – or unidentified comparable form
 * †Siphlurites – type locality for genus
 * †Siphlurites explanatus – type locality for species
 * †Siphonophoroides – type locality for genus
 * †Siphonophoroides antiqua – type locality for species
 * †Siphonophoroides gillettei – type locality for species
 * †Siphonophoroides lassa – type locality for species
 * †Siphonophoroides pennatus – type locality for species
 * †Siphonophoroides simplex – type locality for species
 * Sitona
 * †Sitona exitiorum – type locality for species
 * †Sitona paginarum
 * †Sitones
 * †Sitones exitiorum
 * Sitta
 * †Sitta carolinensis
 * †Smicrorhynchus
 * †Smicrorhynchus macgeei
 * †Smilax
 * †Smilax labidurommae
 * DMNS65L PrimateSkeleton.jpg †[[Smilodectes]]
 * †Smilodectes gracilis
 * †Smilodectes mcgrewi
 * †Solenopsites – type locality for genus
 * †Solenopsites minutus – type locality for species
 * Sonoma
 * †Sonoma margemina
 * Sorex
 * †Sorex arcticus
 * †Sorex hoyi
 * †Sparganium
 * †Sparganium antiquum
 * Spea
 * Spea bombifrons cropped.jpg †[[Spea bombifrons]]
 * †Spermophagus
 * †Spermophagus pluto – type locality for species
 * †Spermophagus vivificatus – type locality for species
 * Spermophilus
 * †Spermophilus elegans – or unidentified comparable form
 * †Spermophilus lateralis
 * †Spermophilus richardsonii
 * †Spermophilus tridecemlineatus
 * †Sphegina
 * †Sphegina obscura – type locality for species
 * Mesatirhinus cropped.jpg †[[Sphenocoelus]]
 * †Sphenocoelus uintensis
 * †Spiladomyia – type locality for genus
 * †Spiladomyia simplex – type locality for species
 * †Spiladopygia
 * †Spiladopygia exsulata – type locality for species
 * †Spiladopygia mortalis – type locality for species
 * Spilogale
 * †Spilogale putorius
 * †Spiniphora
 * †Spiniphora cockerelli – type locality for species
 * Spizella
 * Spizella breweri.jpg †[[Spizella breweri]]
 * †Spodotribus – type locality for genus
 * †Spodotribus terrulentus – type locality for species
 * †Staphylea
 * †Staphylea acuminata
 * †Staphylea minutidens
 * Staphylinus
 * †Staphylinus lesleyi
 * †Staphylinus vetulus – type locality for species
 * †Staphylinus vulcan – type locality for species
 * †Steganus – type locality for genus
 * †Steganus barrandei – type locality for species
 * †Stenoechinus
 * †Stenoechinus tantalus
 * †Stenogomphus – type locality for genus
 * †Stenogomphus carletoni – type locality for species
 * Stenolophusteutonus.png †[[Stenolophus]]
 * †Stenolophus religatus – type locality for species
 * †Stenopamera – type locality for genus
 * †Stenopamera subterrea – type locality for species
 * †Stenopamera tenebrosa – type locality for species
 * †Stenosphenus
 * †Stenosphenus pristinus – type locality for species
 * †Stenovelia – type locality for genus
 * †Stenovelia nigra – type locality for species
 * Stenus
 * †Stenus morsei – type locality for species
 * Scarlet Shower (Sterculia coccinea) (8679258490).jpg [[Sterculia]]
 * †Sterculia rigida
 * †Sterictiphora
 * †Sterictiphora konowi – type locality for species
 * †Stibarus
 * †Stibarus obtusilobus
 * †Stibarus quadricuspis
 * Stilbus
 * †Stilbus pallidus
 * †Stipa
 * †Stipa florissanti
 * †Stolopsyche – type locality for genus
 * †Stolopsyche libytheoides – type locality for species
 * †Strategus
 * †Strategus cessatus – type locality for species
 * †Stratimus
 * †Stratimus strobeli
 * †Striaderes – type locality for genus
 * †Striaderes conradi – type locality for species
 * †Strigorhysis
 * †Strigorhysis huerfanensis – type locality for species
 * †Stygiochelys
 * †Stygiochelys estesi
 * †Stylinodon
 * †Stylinodon mirus
 * Knight Caenopus.jpg †[[Subhyracodon]]
 * †Subhyracodon mitis – type locality for species
 * †Subhyracodon occidentalis
 * †Submeryceros
 * †Submeryceros minor
 * Sylvilagus
 * †Sylvilagus audubonii
 * †Symphoromyia
 * †Symphoromyia subtrita – type locality for species
 * †Synchroa
 * †Synchroa quiescens – type locality for species
 * †Syntomostylus
 * †Syntomostylus rudis
 * Syrphus
 * †Syrphus aphidopsidis – type locality for species
 * †Syrphus carpenteri – type locality for species
 * †Syrphus eocenicus – type locality for species
 * †Syrphus hendersoni – type locality for species
 * †Syrphus lithaphidis – type locality for species
 * †Syrphus petrographicus – type locality for species
 * †Syrphus platychiralis – type locality for species
 * †Syrphus willistoni – type locality for species
 * †Systena
 * †Systena florissantensis – type locality for species

T

 * †Tabanus
 * †Tabanus hipparionis – type locality for species
 * †Tabanus parahippi – type locality for species
 * Tachinus
 * †Tachinus angustatus
 * †Tachinus elongatus
 * †Tachinus fimbriatus
 * †Tachinus schwarzi
 * †Tachinus sommatus – type locality for species
 * Tachycineta
 * Tree swallow at Stroud Preserve.jpg †[[Tachycineta bicolor]]
 * †Tachypeza
 * †Tachypeza primitiva – type locality for species
 * Tachyporus
 * †Tachyporus annosus – type locality for species
 * †Tachyporus nimbicola
 * †Tachys
 * †Tachys haywardi – type locality for species
 * †Taeniopodites – type locality for genus
 * †Taeniopodites pardalis – type locality for species
 * †Taeniurites – type locality for genus
 * †Taeniurites fortis – type locality for species
 * †Tagalodes – type locality for genus
 * †Tagalodes inermis – type locality for species
 * †Talpavus
 * Tamiasciurus
 * Tamiasciurus hudsonicus CT.jpg †[[Tamiasciurus hudsonicus]]
 * Tanysphyrus
 * †Tanysphyrus lemnae
 * †Taphacris – type locality for genus
 * †Taphacris bittaciformis – type locality for species
 * †Taphacris reliquata – type locality for species
 * †Tapholyda
 * †Tapholyda caplani – type locality for species
 * Tapirus
 * †Tapirus haysii
 * †Taracticus
 * †Taracticus contusus – type locality for species
 * †Taracticus hypogaeus – type locality for species
 * †Taracticus renovatus – type locality for species
 * Taxidea
 * †Taxidea taxus
 * †Teilhardina
 * Teleoceras Horsfall cropped.jpg †[[Teleoceras]]
 * †Teleoceras americanum – type locality for species
 * †Teleoceras hicksi
 * †Teleoceras medicornutum
 * †Teleocoris – type locality for genus
 * †Teleocoris pothetias – type locality for species
 * †Teleoschistus
 * †Teleoschistus placatus – type locality for species
 * †Teleoschistus rigoratus – type locality for species
 * †Tenebrionites
 * †Tenebrionites alatus – type locality for species
 * †Tenebroides
 * †Tenebroides corrugata – type locality for species
 * †Tenillus – type locality for genus
 * †Tenillus firmus – type locality for species
 * †Tenor – type locality for genus
 * †Tenor speluncae – type locality for species
 * †Tenthredella
 * †Tenthredella fenestralis – type locality for species
 * †Tenthredella oblita – type locality for species
 * †Tenthredella toddi – type locality for species
 * Tenthredinidae - Tenthredo arcuata-1.jpg †[[Tenthredo]]
 * †Tenthredo avia – type locality for species
 * †Tenthredo infossa – type locality for species
 * †Tenthredo saxorum – type locality for species
 * †Tenthredo submersa – type locality for species
 * †Teretrum
 * †Teretrum primulum – type locality for species
 * †Tethneus
 * †Tethneus guyoti
 * †Tethneus hentzi – type locality for species
 * †Tethneus obduratus – type locality for species
 * †Tethneus provectus – type locality for species
 * †Tethneus robustus – type locality for species
 * †Tethneus twenhofeli – type locality for species
 * †Tetigonia
 * †Tetigonia obtecta – type locality for species
 * †Tetigonia priscotincta – type locality for species
 * †Tetonius
 * †Tetonius matthewi
 * †Tetonius mckennai – type locality for species
 * Tetragnatha.extensa.female.jpg †[[Tetragnatha]]
 * †Tetragnatha tertiaria – type locality for species
 * †Tetragoneura
 * †Tetragoneura peritula – type locality for species
 * †Tetraonyx
 * †Tetraonyx minuscula – type locality for species
 * †Tetraopes
 * †Tetraopes submersus – type locality for species
 * †Tetrapus
 * †Tetrapus mayri – type locality for species
 * Tetratoma
 * †Tetratoma concolor
 * †Tettoraptor – type locality for genus
 * †Tettoraptor maculatus – type locality for species
 * †Texasophis
 * †Texasophis fossilis
 * †Texasophis galbreathi – type locality for species
 * †Texoceros
 * †Texoceros vaughani – type locality for species
 * Thamnophis
 * †Thamnophis elegans
 * Thamnophis sirtalis sirtalis Wooster.jpg †[[Thamnophis sirtalis]]
 * †Thamnotettix
 * †Thamnotettix eocenicus – type locality for species
 * †Thamnotettix fundi – type locality for species
 * †Thamnotettix packardi – type locality for species
 * †Thanasimus
 * †Thanasimus florissantensis – type locality for species
 * Thanatophilus
 * †Thanatophilus coloradensis
 * †Thaumastocladius – type locality for genus
 * †Thaumastocladius simplex – type locality for species
 * Themira.putris.jpg †[[Themira]]
 * †Themira saxifica – type locality for species
 * †Theronia
 * †Theronia wickhami – type locality for species
 * †Thisbemys
 * †Thisbemys elachistos
 * †Thisbemys perditus – type locality for species
 * †Thlibomenus – type locality for genus
 * †Thlibomenus limosus – type locality for species
 * †Thlibomenus macer – type locality for species
 * †Thlibomenus parvus – type locality for species
 * †Thlibomenus perennatus – type locality for species
 * †Thlibomenus petreus – type locality for species
 * †Thlimmoschistus – type locality for genus
 * †Thlimmoschistus gravidatus – type locality for species
 * †Thnetoschistus – type locality for genus
 * †Thnetoschistus revulsus – type locality for species
 * Thomisus kitamurai.female.1.-.tanikawa.jpg †[[Thomisus]]
 * †Thomisus defossus – type locality for species
 * †Thomisus disjunctus – type locality for species
 * †Thomisus resutus – type locality for species
 * Thomomys
 * †Thomomys talpoides
 * †Thouinia
 * †Thouinia straciata
 * †Thryptacodon
 * †Thryptacodon antiquus
 * †Thryptacodon australis – type locality for species
 * †Thuja
 * †Thuja interrupta
 * †Thylacodon
 * †Thylacodon montanensis
 * †Thylacodon pusillus
 * Hypsiops breviceps Exhibit Museum of Natural History cropped.jpg †[[Ticholeptus]]
 * Tilia
 * †Tilia populifolia
 * †Tillomys
 * †Tillomys senex – or unidentified comparable form
 * †Tingis
 * †Tingis florissantensis – type locality for species
 * †Tinodes – tentative report
 * †Tinodes paludigena – type locality for species
 * Tipula – type locality for genus
 * †Tipula bilineata – type locality for species
 * †Tipula carolinae – type locality for species
 * †Tipula carpenteri – type locality for species
 * †Tipula clauda
 * †Tipula consumpta – type locality for species
 * †Tipula evanitura
 * †Tipula florissanta
 * †Tipula fmartinbrowni – type locality for species
 * †Tipula heilprini – type locality for species
 * †Tipula hepialina – type locality for species
 * †Tipula internecata
 * †Tipula lapillescens – type locality for species
 * †Tipula lethaea – type locality for species
 * †Tipula limi
 * †Tipula maclurei
 * †Tipula magnifica – type locality for species
 * †Tipula needhami – type locality for species
 * †Tipula paludis – type locality for species
 * †Tipula picta – type locality for species
 * †Tipula reliquiae – type locality for species
 * †Tipula revivificata – type locality for species
 * †Tipula rigens
 * †Tipula subterjacens – type locality for species
 * †Tipula tartari – type locality for species
 * †Tipula wilmatteae – type locality for species
 * †Tipulidea
 * †Tipulidea distincta
 * †Tiromerus – type locality for genus
 * †Tiromerus tabifluus – type locality for species
 * †Tiromerus torpefactus – type locality for species
 * †Tiroschistus – type locality for genus
 * †Tiroschistus indurescens – type locality for species
 * †Titanoeca
 * †Titanoeca ingenua – type locality for species
 * Titanoides2010.jpg †[[Titanoides]]
 * †Titanoides looki
 * †Titanoides primaevus
 * †Tithonomyia
 * †Tithonomyia atra – type locality for species
 * †Tomarctus
 * †Tomarctus brevirostris – type locality for species
 * †Tomoxia
 * †Tomoxia inundata – type locality for species
 * †Torreya
 * †Torreya geometrorum
 * †Tortricites
 * †Tortricites destructus – type locality for species
 * British Moths - Green Oak Tortrix - Tortrix viridana 3.jpg †[[Tortrix]]
 * †Tortrix florissantana – type locality for species
 * †Torymus
 * †Torymus sackeni – type locality for species
 * †Toxorhynchus
 * †Toxorhynchus arctus
 * †Toxorhynchus confectum – type locality for species
 * †Toxorhynchus corruptus – type locality for species
 * †Toxorhynchus florissantensis – type locality for species
 * †Toxorhynchus grandis – type locality for species
 * †Toxorhynchus minusculus – type locality for species
 * †Toxorhynchus oculatus – type locality for species
 * †Toxorhynchus pumilum
 * †Toxorhynchus refrenatum – type locality for species
 * †Toxorhynchus reventus – type locality for species
 * †Toxorhynchus scudderianum – type locality for species
 * †Tracheliodes
 * †Tracheliodes mortuellus – type locality for species
 * †Trapezonotus
 * †Trapezonotus exterminatus – type locality for species
 * †Trapezonotus stygialis – type locality for species
 * Trechoblemus micros - Reitter.jpg [[Trechus]]
 * †Trechus fractus – type locality for species
 * †Tribochrysa – type locality for genus
 * †Tribochrysa firmata – type locality for species
 * †Tribochrysa inequalis – type locality for species
 * †Tricentes
 * †Tricentes subtrigonus
 * †Trichilia
 * †Trichilia florissanti
 * †Trichiosomites – type locality for genus
 * †Trichiosomites obliviosus – type locality for species
 * †Triga
 * †Triga coeni – type locality for species
 * †Trigonias
 * †Trigonias osborni – type locality for species
 * †Trigonorhinus
 * †Trigonorhinus sordidus – type locality for species
 * †Trigonoscuta
 * †Trigonoscuta inventa – type locality for species
 * †Triplax
 * †Triplax diluviana – type locality for species
 * †Triplax materna – type locality for species
 * †Triplax petrefacta – type locality for species
 * †Triplax submersa – type locality for species
 * †Triplopus
 * †Triplopus implicatus
 * †Trirhabda
 * †Trirhabda majuscula – type locality for species
 * †Trirhabda megacephala – type locality for species
 * †Trirhabda sepulta
 * Tritemnodon agilis cropped.jpg †[[Tritemnodon]]
 * †Tritemnodon strenuus – or unidentified comparable form
 * †Triumfetta
 * †Triumfetta ovata – type locality for species
 * Trixagus
 * †Trixagus sericeus
 * †Trixoscelis
 * †Trixoscelis patefacta – type locality for species
 * †Trogosus
 * †Trogosus grangeri
 * Trogoxylon
 * †Trogoxylon parallelopipedum
 * †Trogus
 * †Trogus vetus – type locality for species
 * †Tropideres
 * †Tropideres vastatus – type locality for species
 * †Tropisternus
 * †Tropisternus limitatus – type locality for species
 * †Tropisternus vanus – type locality for species
 * Trox
 * †Trox antiquus – type locality for species
 * †Trypherus
 * †Trypherus aboriginalis – type locality for species
 * †Tryphon
 * †Tryphon amasidis – type locality for species
 * †Tryphon cadaver – type locality for species
 * †Tryphon explanatum – type locality for species
 * †Tryphon florissantensis – type locality for species
 * †Tryphon lapideus – type locality for species
 * †Tryphon peregrinus – type locality for species
 * †Tryphon senex – type locality for species
 * †Tychius
 * †Tychius evolatus
 * †Tychius ferox – type locality for species
 * †Tychius secretus – type locality for species
 * †Tylecomnus
 * †Tylecomnus davisii – type locality for species
 * †Tylecomnus pimploides – type locality for species
 * †Tylocomnus
 * †Tylocomnus creedensis – type locality for species
 * Typha-cattails-in-indiana.jpg [[Typha]]
 * †Typha lesquereuxi
 * †Tyrbula
 * †Tyrbula russelli – type locality for species
 * †Tyrbula scudderi – type locality for species

U

 * †Ubiquitoxylon – type locality for genus
 * †Ubiquitoxylon raynoldsii – type locality for species
 * †Uintacyon
 * †Uintacyon asodes
 * †Uintacyon massetericus – or unidentified comparable form
 * †Uintanius
 * †Uintanius rutherfurdi
 * †Uintascorpio – type locality for genus
 * †Uintascorpio halandrasorum – type locality for species
 * East Coker elm, 2.jpg [[Ulmus]]
 * †Ulmus rhamnifolia
 * †Ulmus tenuinervis
 * †Ulus
 * †Ulus minutus – type locality for species
 * Urocyon
 * †Urocyon cinereoargenteus
 * †Urolibellula – type locality for genus
 * †Urolibellula eocenica – type locality for species
 * †Urortalis
 * †Urortalis caudatus – type locality for species
 * †Urosigalphus
 * †Urosigalphus aeternus – type locality for species
 * †Ursavus
 * †Ursavus pawniensis
 * Ursus
 * 01 Schwarzbär cropped.jpg †[[Ursus americanus]]
 * †Ustatochoerus
 * †Ustatochoerus medius
 * †Utemylus
 * †Utemylus latomius – type locality for species
 * †Utemylus serior

V

 * †Vanessa
 * †Vanessa amerindica – type locality for species
 * †Vauquelinia
 * †Vauquelinia coloradensis
 * †Verrallites – type locality for genus
 * †Verrallites cladurus – type locality for species
 * †Viburnum
 * †Viburnum goldianum
 * †Viburnum solitarium
 * †Vicia
 * †Villa – type locality for genus
 * †Villa setosa – type locality for species
 * Vitis californica with grapes.jpg [[Vitis]]
 * †Vitis lobata
 * †Vitis olriki
 * †Viverravus
 * †Viverravus acutus
 * †Viverravus gracilis
 * †Viverravus lutosus
 * †Viverravus minutus
 * †Viverravus politus – or unidentified comparable form
 * †Viverravus sicarius
 * †Vrilletta
 * †Vrilletta monstrosa – type locality for species
 * †Vrilletta tenuistriata – type locality for species
 * Vulpavus ovatus.JPG †[[Vulpavus]]
 * †Vulpavus australis – or unidentified comparable form
 * †Vulpavus canavus
 * Vulpes
 * †Vulpes stenognathus
 * †Vulpes velox
 * †Vulpes vulpes

W

 * †Washakius
 * †Washakius izetti – or unidentified comparable form
 * Weinmannia tinctoria flowers.JPG †[[Weinmannia]]
 * †Weinmannia phenacophylla
 * †Wickia – type locality for genus
 * †Wickia brevirhinus – type locality for species
 * †Wilsoneumys
 * †Wilsoneumys planidens
 * †Wilsonosorex
 * †Wilsonosorex conulatus
 * †Woodwardia
 * †Woodwardia arctica

X

 * Xantholinus sp.jpg †[[Xantholinus]]
 * †Xantholinus tenebrarius – type locality for species
 * †Xenacodon
 * †Xenacodon mutilatus – type locality for species
 * †Xenicohippus
 * †Xenicohippus craspedotum
 * †Xenicohippus grangeri
 * †Xenicohippus osborni
 * †Xenoberotha – type locality for genus
 * †Xenoberotha angustialata – type locality for species
 * †Xestobium
 * †Xestobium alutaceum – type locality for species
 * Xyela
 * †Xyela florissantensis – type locality for species
 * Xyleborinus
 * †Xyleborinus saxeseni
 * †Xyleborites – type locality for genus
 * †Xyleborites longipennis – type locality for species
 * †Xylobiops
 * †Xylobiops lacustre – type locality for species
 * Carpenter bee.jpg †[[Xylocopa]]
 * †Xylocopa gabrielae – type locality for species
 * †Xylomya
 * †Xylomya inornata – type locality for species
 * †Xylomyia
 * †Xylomyia moratula – type locality for species
 * †Xylonomus
 * †Xylonomus sejugatus – type locality for species
 * †Xyronomys
 * †Xyronomys robinsoni – type locality for species

Y

 * †Ylasoia
 * †Ylasoia secunda – type locality for species
 * †Yumaceras
 * †Yumaceras figginsi

Z

 * †Zacallites – type locality for genus
 * †Zacallites balli – type locality for species
 * Starr 060905-8736 Zamia furfuracea.jpg [[Zamia]]
 * †Zamia coloradensis
 * †Zanycteris – type locality for genus
 * †Zanycteris honeyi – type locality for species
 * †Zanycteris paleocenus – type locality for species
 * Zelkova
 * †Zelkova nervosa
 * †Zelkova planeroides
 * †Zetobora
 * †Zetobora brunneri – type locality for species
 * †Zingiberites
 * †Zingiberites dubius
 * Zizyphus
 * †Zizyphus fibrillosus
 * †Zizyphus florissanti
 * Zonotrichia
 * †Zonotrichia leucophrys
 * †Zootermopsis
 * †Zootermopsis coloradensis – type locality for species
 * Mammut borsoni from Milia.jpg †[[Zygolophodon]]