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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.

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• 

  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

• 

  †Adocus
• Aegialia
  • †Aegialia opaca
• †Aelurodon
  • †Aelurodon asthenostylus

• 

  †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

• 

  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
  • †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
  • †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
  • †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

• 

  †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

• 

  †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
  • †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
  • †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
  • †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

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  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

  • 

    †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
  • †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
  • †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
  • †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
  • †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
  • †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

• 

  †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

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• †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
  • †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
  • †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
  • †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
• †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
• †Borophagus
  • †Borophagus pugnator
• †Bouromeryx
  • †Bouromeryx americanus – type locality for species
• †Brachinus
  • †Brachinus newberryi – type locality for species
  • †Brachinus repressus – type locality for species

• 

  †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
  • †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
• 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 fluviaticus – type locality for species
• Byrrhus
  • †Byrrhus eximius
  • †Byrrhus romingeri
• †Bythoscopus
  • †Bythoscopus lapidescens – type locality for species

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• †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

• 

  †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

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    †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
  • †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
  • †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

  • 

    †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
  • †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
  • †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 – 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
• 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
  • †Chamaedorea danae
• †Chaneya

  • 

    †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
  • †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

• 

  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

• 

  †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
  • †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

• 

  †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

• 

  †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

• 

  †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
  • †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
  • †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
• †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
  • †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

• 

  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
• 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

• A
• B
• C
• D
• E
• F
• G
• H
• I
• J
• K
• L
• M
• N
• O
• P
• Q
• R
• S
• T
• U
• V
• W
• X
• Y
• Z

• †Daphne
  • †Daphne septentrionalis
• Daphnia

• 

  †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
  • †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
  • †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

• 

  †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
  • †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

• 

  †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

  • 

    †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
  • †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
  • †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

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• D
• E
• F
• G
• H
• I
• J
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• U
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• X
• Y
• Z

• †Earinus
  • †Earinus saxatilis – type locality for species
• †Ecclesimus
  • †Ecclesimus tenuiceps
• †Echinaphis – type locality for genus
  • †Echinaphis rohweri – type locality for species

• 

  †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
  • †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
  • †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

• 

  †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
  • †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

• 

  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
  • †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
• 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
  • †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
  • †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 – 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

  • 

    †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

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• D
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• †Fagopsis
  • †Fagopsis longifolia
• Falcipennis
  • †Falcipennis canadenis
• Falco

  • 

    †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 (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

  • 

    Fulica americana
• †Fuscus – tentative report
  • †Fuscus faecatus – type locality for species

G

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• †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
• †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

• 

  †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
  • †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

• 

  †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

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• D
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• F
• G
• H
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• †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
  • †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

• 

  †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

• 

  †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
  • †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
  • †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
  • †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
  • †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
  • †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
  • †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

• 

  †Hyracodon
  • †Hyracodon arcidens – type locality for species
  • †Hyracodon leidyanus
  • †Hyracodon nebraskensis
• †Hyracotherium
  • †Hyracotherium vasacciense
• †Hystricops

I

• A
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• C
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• F
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• †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
  • †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
  • †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

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• †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
  • †Juglans berryana
• Junco
  • †Junco hyemalis
• †Juncus
  • †Juncus crassulus
• †Jungermanniopsis
  • †Jungermanniopsis cockerellii
• †Jupitellia – type locality for genus
  • †Jupitellia charon – type locality for species

K

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• 

  †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

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• †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

• 

  †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

• 

  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

• 

  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
  • †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

  • 

    †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
  • †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 – 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
  • †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 – 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

  • 

    †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
  • †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