List of the Mesozoic life of Wyoming

This list of the Mesozoic life of Wyoming contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Wyoming and are between 252.17 and 66 million years of age.

A

• †Abielites
  • †Abielites angusticarpus

• 

  Illustration of a living Acipenser sturgeon

  Acipenser
  • †Acipenser eruciferus
• †Acutostrea
  • †Acutostrea plumosa
• †Adocus
• †Agathaumas – type locality for genus
  • †Agathaumas sylvestris – type locality for species
• †Agerostrea
  • †Agerostrea mesenterica
• †Agialopous – type locality for genus
  • †Agialopous wyomingensis – type locality for species

• 

  Restoration of the Cretaceous-Pleistocene amphibian Albanerpeton

  †Albanerpeton
  • †Albanerpeton galaktion
  • †Albanerpeton nexuosus – type locality for species
• †Albertosaurus – or unidentified comparable form
• †Alethesaurus – type locality for genus
  • †Alethesaurus quadratus – type locality for species
• †Allacodon
  • †Allacodon lentus – type locality for species
  • †Allacodon pumilis – type locality for species
• †Allognathosuchus

• 

  Life restoration of the Late Jurassic theropod dinosaur Allosaurus

  †Allosaurus – type locality for genus
  • †Allosaurus fragilis – type locality for species
  • †Allosaurus jimmadseni
• †Alostera
  • †Alostera saskatchewanensis – type locality for species
• †Alphadon
  • †Alphadon attaragos – type locality for species
  • †Alphadon halleyi
  • †Alphadon marshi
  • †Alphadon sahnii
• †Altacreodus
  • †Altacreodus magnus
• †Alzadites
  • †Alzadites westonensis – type locality for species
• †Amblotherium – type locality for genus
  • †Amblotherium gracilis – type locality for species
• †Amborellites – type locality for genus
  • †Amborellites wyomingensis – type locality for species

• 

  A living Amia, or bowfin

  Amia
  • †Amia fragosa
  • †Amia uintaensis
• †Amphicoelias
  • †Amphicoelias brontodiplodocus – type locality for species
• †Amphidon – type locality for genus
  • †Amphidon superstes – type locality for species
• †Anaklinoceras
  • †Anaklinoceras mortoni
• †Anaschisma – type locality for genus
  • †Anaschisma brachygnatha – type locality for species
  • †Anaschisma browni – type locality for species
• †Anceptophyllum – type locality for genus
  • †Anceptophyllum pulcrum – type locality for species
• †Anchura – tentative report
• †Ancorichnus
• †Andromeda
  • †Andromeda grayana
• †Anemia
  • †Anemia fremonti
  • †Anemia subcretacea

• 

  Restoration of the Late Triassic phytosaur Angistorhinus

  †Angistorhinus – type locality for genus
  • †Angistorhinus aeolamnis – type locality for species
  • †Angistorhinus gracilis – type locality for species
  • †Angistorhinus grandis – type locality for species
  • †Angistorhinus maximus – type locality for species
• †Anisoceras
• †Anisomyon
  • †Anisomyon borealis
  • †Anisomyon centrale
  • †Anisomyon patelliformis
  • †Anisomyon subovatus – or unidentified related form
  • †Anisomyon subovulatus
• †Ankistrorhynchus
  • †Ankistrorhynchus washakiensis – type locality for species

• 

  Life restoration of the Late Cretaceous armored dinosaur Ankylosaurus

  †Ankylosaurus
  • †Ankylosaurus magniventris
• †Anomalofusus – tentative report
• Anomia
  • †Anomia tellinoides
• Anona
  • †Anona robusta – tentative report
• †Anthrotaxopsis
  • †Anthrotaxopsis tenuicaulis
• Antrimpos
• †Apatodonosaurus
  • †Apatodonosaurus grayi
• †Apatosaurinae
  • †Apatosaurinae – type locality for genus – informal

• 

  Life restoration of the Late Jurassic sauropod dinosaur Apatosaurus

  †Apatosaurus
  • †Apatosaurus louisae
  • †Apatosaurus minimus
• †Apeibopsis – tentative report
  • †Apeibopsis discolor
• †Aploconodon – type locality for genus
  • †Aploconodon comoensis – type locality for species
• Aporrhais
  • †Aporrhais biangulata
• †Aquilina – type locality for genus
  • †Aquilina grossidentata – type locality for species
• Aralia
  • †Aralia veatchii
• †Araliaephyllum
  • †Araliaephyllum artocarpoides

• 

  Foliage and cones of a living Araucaria tree

  Araucaria
• †Araucarites
  • †Araucarites cuneatus – type locality for species
  • †Araucarites longifolia
  • †Araucarites wyomingensis – type locality for species
• Arca – report made of unidentified related form or using admittedly obsolete nomenclature
• †Arcellites
  • †Arcellites disciformis
• †Archaeotriakis
  • †Archaeotriakis ornatus – type locality for species
  • †Archaeotriakis rochelleae
• †Archaeotrigon – type locality for genus
  • †Archaeotrigon brevimaxillus – type locality for species

• 

  Fossilized shells of the Middle Jurassic ammonoid cephalopod Arcticoceras

  †Arcticoceras
• †Arenicolites
• †Aristolochites
  • †Aristolochites brittoni
• †Ascarinites – type locality for genus
  • †Ascarinites communis – type locality for species
• Aspideretes
• †Aspideretoides
  • †Aspideretoides foveatus – or unidentified comparable form
• †Asplenites
  • †Asplenites tenellum

• 

  A living Asplenium, or spleenwort

  †Asplenium
  • †Asplenium haguei
  • †Asplenium neomexicanum
  • †Asplenium occidentale
• †Astandes
  • †Astandes densatus
• †Astarta
  • †Astarta packardi
• Astarte
  • †Astarte gregaria
  • †Astarte livingstonensis
  • †Astarte meeki
  • †Astarte morion
• †Athrotaxopsis
  • †Athrotaxopsis tenuicaulis
• † Atira – tentative report
  • †Atira nebrascensis
• †Atokatheridium – or unidentified comparable form

• 

  Illustration of fossilized teeth from the Late Cretaceous tyrannosaur Aublysodon

  †Aublysodon
  • †Aublysodon mirandus
• †Austrotindaria
  • †Austrotindaria antiqua
  • †Austrotindaria canalensis
  • †Austrotindaria svalbardensis
• †Avernalia – type locality for genus
  • †Avernalia solida – type locality for species

B

• 

  Fossilized shell of the Late Cretaceous ammonoid cephalopod Baculites

  †Baculites
  • †Baculites asper
  • †Baculites asperiformis
  • †Baculites baculus
  • †Baculites clinolobatus
  • †Baculites cobbani
  • †Baculites codyensis
  • †Baculites crickmayi
  • †Baculites elaisi
  • †Baculites eliasi
  • †Baculites gilberti
  • †Baculites grandis
  • †Baculites gregoryensis
  • †Baculites haresi
  • †Baculites jenseni – or unidentified comparable form
  • †Baculites mariasensis
  • †Baculites mclearni
  • †Baculites obtusus
  • †Baculites perplexus
  • †Baculites reesidei
  • †Baculites rugosus
  • †Baculites scotti
• †Baena
  • †Baena hatcheri – type locality for species
  • †Baena hayi – type locality for species
  • †Baena marshi – type locality for species
• †Baieropsis
  • †Baieropsis adiantifolia
  • †Baieropsis pluripartita
• †Baptanodon
  • †Baptanodon discus
  • †Baptanodon reedi – type locality for species
  • †Baptanodon robustus – type locality for species
• Barbatia – tentative report

• 

  Restoration of the Late Jurassic sauropod dinosaur Barosaurus rearing to defend itself against a pair of the theropod Allosaurus

  †Barosaurus
  • †Barosaurus lentus
• †Basilemys
  • †Basilemys sinuosa
• †Batodon
  • †Batodon tenuis – type locality for species
• †Belonostomus
  • †Belonostomus longirostris
• Berenicea
• Bombur
• †Borealosuchus
  • †Borealosuchus sternbergii – type locality for species
• †Boremys
• †Borissiakoceras
  • †Borissiakoceras orbiculatum
• Botula
  • †Botula ripleyana

• 

  A living Brachaelurus, or blind shark

  Brachaelurus
  • †Brachaelurus bighornensis – type locality for species
• †Brachiosaurus
• †Brachybrachium – type locality for genus
  • †Brachybrachium brevipes – type locality for species
• †Brachychampsa
  • †Brachychampsa montana
• †Brachyphyllum
  • †Brachyphyllum crassum
• †Brontopodus – or unidentified comparable form
  • †Brontopodus birdi

• 

  Life restoration of a herd of the Late Jurassic sauropod dinosaur Brontosaurus

  †Brontosaurus – type locality for genus
  • †Brontosaurus excelsus – type locality for species
  • †Brontosaurus parvus – type locality for species
  • †Brontosaurus yahnahpin – type locality for species
• †Bryceomys
• †Bullopsis
  • †Bullopsis cretacea – or unidentified related form

C

• †Cadoceras
• Callista
  • †Callista deweyi
  • †Callista peplucida
• †Calycoceras
  • †Calycoceras canitaurinum

• 

  Life restoration of a herd of the Late Jurassic sauropod dinosaur Camarasaurus

  †Camarasaurus – type locality for genus
  • †Camarasaurus grandis – type locality for species
  • †Camarasaurus lentus – type locality for species
• †Camborygma
• Campeloma
• †Camptomus
  • †Camptomus amplus – type locality for species
• †Camptonectes
  • †Camptonectes bellistriatus
  • †Camptonectes distans – or unidentified comparable form
  • †Camptonectes platessiformis
  • †Camptonectes stygius

• 

  Life restoration of the Late Jurassic ornithopod dinosaur Camptosaurus

  †Camptosaurus
  • †Camptosaurus dispar – type locality for species
• † Canna
  • †Canna magnifolia – tentative report
• †Capillirhynchia
  • †Capillirhynchia gallatinensis – type locality for species
• Cardium sp.
• †Carpites
  • †Carpites lancensis
  • †Carpites verrucosus
  • †Carpites walcotti
• †Carpolithus
  • †Carpolithus barrensis – type locality for species
  • †Carpolithus fasciculatus
  • †Carpolithus foenarius – type locality for species
  • †Carpolithus montiumnigrorum – type locality for species
  • †Carpolithus virginiensis
• †Carthaginites
  • †Carthaginites aquilonius – type locality for species
• †Cataceramus
  • †Cataceramus tenuilineatus
• †Cedrobaena
  • †Cedrobaena brinkman
• †Celastrophyllum
  • †Celastrophyllum gyminaefolium

• 

  Foliage and fruit of a living Celastrus, or staff vine

  †Celastrus – tentative report
  • †Celastrus taurinensis
• †Cemeterius – type locality for genus
  • †Cemeterius monstrosus – type locality for species
• †Centrophoroides
  • †Centrophoroides worlandensis – type locality for species
• †Cephalotaxopsis
  • †Cephalotaxopsis magnifolia
• †Ceramornis – type locality for genus
  • †Ceramornis major – type locality for species
• †Ceratodus
  • †Ceratodus frazieri
  • †Ceratodus guentheri

• 

  Restoration of the Late Jurassic ceratosaur Ceratosaurus

  †Ceratosaurus
• Cercidiphyllum
  • †Cercidiphyllum arcticum
  • †Cercidiphyllum ellipticum
• †Cercomya
  • †Cercomya punctata
• †Ceritella
• Cerithium – tentative report
• †Chamops – type locality for genus
  • †Chamops segnis – type locality for species

• 

  Life restoration of the Late Cretaceous-Eocene choristoderan reptile Champsosaurus

  †Champsosaurus
  • †Champsosaurus natator
• †Chelonipus – or unidentified comparable form
• Chiloscyllium
  • †Chiloscyllium missouriense
• †Chirotherium
  • †Chirotherium barthii
• Chlamys
  • †Chlamys nebrascensis
• †Chondroceras
• †Cimexomys
  • †Cimexomys minor
• †Cimolestes
  • †Cimolestes incisus – type locality for species
  • †Cimolestes stirtoni – type locality for species
• †Cimolodon
  • †Cimolodon nitidus – type locality for species
  • †Cimolodon peregrinus – type locality for species

• 

  Life restoration of the face of the Late Cretaceous multituberculate mammal Cimolomys

  †Cimolomys
  • †Cimolomys clarki
  • †Cimolomys gracilis – type locality for species
  • †Cimolomys parvus – type locality for species
• †Cimolopteryx
  • †Cimolopteryx maxima – type locality for species
  • †Cimolopteryx rara
• Cinnamomum
  • †Cinnamomum hesperium
• †Cissitis
  • †Cissitis rocklandensis
• Cissus
  • †Cissus lobato-crenata – tentative report
• †Cladoceramus
  • †Cladoceramus undulatoplicatus – or unidentified related form

• 

  Fossilized foliage of the Permian-Late Cretaceous fern Cladophlebis

  Cladophlebis
  • †Cladophlebis parva
  • †Cladophlebis readi – type locality for species
  • †Cladophlebis readii
  • †Cladophlebis wyomingensis – type locality for species
• †Claraia
  • †Claraia clarai
  • †Claraia mulleri
  • †Claraia stachei
• †Clemensodon – type locality for genus
  • †Clemensodon megaloba – type locality for species
• †Clioscaphites
  • †Clioscaphites saxitonianus
  • †Clioscaphites vermiformis
• †Coahuilites
  • †Coahuilites sheltoni
• †Coelostylina
• †Coelosuchus – type locality for genus
  • †Coelosuchus reedii – type locality for species

• 

  Diagram illustrating the known fossil material of the Late Jurassic theropod dinosaur Coelurus

  †Coelurus – type locality for genus
  • †Coelurus fragilis – type locality for species
• †Collignoniceras
  • †Collignoniceras woollgari
• †Colpodontosaurus – type locality for genus
  • †Colpodontosaurus cracens – type locality for species
• †Comobatrachus – type locality for genus
  • †Comobatrachus aenigmaticus – type locality for species
• †Comodactylus – type locality for genus
  • †Comodactylus ostromi – type locality for species
• †Comodon – type locality for genus
  • †Comodon gidleyi – type locality for species
• †Comonecturoides – type locality for genus
  • †Comonecturoides marshi – type locality for species
• †Comotherium – type locality for genus
  • †Comotherium richi – type locality for species
• †Compsemys
  • †Compsemys victa
• †Confusionella
  • †Confusionella loczyi – type locality for species

• 

  Illustration of fossilized vertebrae of the Late Cretaceous-Eocene snake Coniophis. Othniel Charles Marsh (1892).

  †Coniophis – type locality for genus
  • †Coniophis precedens – type locality for species
• †Coniopteris – tentative report
• †Contogenys – or unidentified comparable form
• †Corax
• †Corbicella – tentative report
• Corbula
  • †Corbula crassimarginata
  • †Corbula kanabensis
  • †Corbula munda
• †Coriops
  • †Coriops amnicolus
• †Cornophyllum
  • †Cornophyllum wardii

• 

  Life restoration of the Early Triassic plesiosaur relative Corosaurus

  †Corosaurus
  • †Corosaurus alcovensis
• Cossmannea
• Crassatella
  • †Crassatella evansi
• †Crassidenticulum
  • †Crassidenticulum aquilae – type locality for species
  • †Crassidenticulum decurrens
• Crenella
• †Cretorectolobus
  • †Cretorectolobus olsoni
• †Cryptometoicoceras – type locality for genus
  • †Cryptometoicoceras mite – type locality for species
• †Cryptorhytis
  • †Cryptorhytis cheyennensis
• †Ctenacodon – type locality for genus
  • †Ctenacodon laticeps – type locality for species
  • †Ctenacodon scindens – type locality for species
  • †Ctenacodon serratus – type locality for species
• †Cteniogenys – type locality for genus
  • †Cteniogenys antiquus – type locality for species
• †Ctenostreon
  • †Ctenostreon gikshanensis – or unidentified comparable form

• 

  Shell of a Cucullaea, or false ark shell

  Cucullaea
  • †Cucullaea haguei
  • †Cucullaea shumardi
• †Cunningtoniceras
• Cuspidaria
  • †Cuspidaria variablis
• †Cycadeospermum
  • †Cycadeospermum rotundatum
• †Cyclurus
  • †Cyclurus fragosus
• †Cylindricum
• †Cymbophora
  • †Cymbophora canonensis – or unidentified comparable form
  • †Cymbophora formosa
  • †Cymbophora holmesi
• †Cyperacites
• †Czekanowskia
  • †Czekanowskia nervosa

D

• †Dakotasaurus – type locality for genus
  • †Dakotasaurus browni – type locality for species
• †Daspletosaurus

• 

  Life restoration of the Early Cretaceous dromaeosaur ("raptor") Deinonychus

  †Deinonychus
  • †Deinonychus antirrhopus
• †Delphodon
  • †Delphodon comptus – type locality for species
• †Deltatheroides – or unidentified comparable form
• †Dennstaedtia
  • †Dennstaedtia fremonti
• Dentalium
  • †Dentalium gracile
  • †Dentalium pauperculum
• †Derrisemys
  • †Derrisemys sterea

• 

  Restoration of the Late Triassic aetosaur Desmatosuchus with an anachronistic human to scale

  †Desmatosuchus
• †Desmoscaphites
  • †Desmoscaphites bassleri
• †Dewalquea
  • †Dewalquea pulchella
• †Diastopora
  • †Diastopora cutleri – type locality for species
• †Dicellonema
  • †Dicellonema abrekensis
• †Dicotyledon

• 

  Life restoration of the Late Cretaceous marsupial relative Didelphodon

  †Didelphodon
  • †Didelphodon vorax – type locality for species
• †Didymoceras
  • †Didymoceras nebrascense
  • †Didymoceras stevensoni
• †Dillenites
  • †Dillenites cleburni
• †Dinochelys
  • †Dinochelys whitei
• †Diospyros
  • †Diospyros stenosepala
• †Diploconcha
• †Diplocraterion
• †Diplodocinae
  • †Diplodocinae – type locality for genus – informal

• 

  Life restoration of the Late Jurassic long-necked dinosaur Diplodocus

  †Diplodocus
  • †Diplodocus carnegii – type locality for species
  • †Diplodocus hallorum
  • †Diplodocus longus
• †Discoscaphites
• †Docodon – type locality for genus
  • †Docodon affinis – type locality for species
  • †Docodon crassus – type locality for species
  • †Docodon striatus – type locality for species
  • †Docodon superus – type locality for species
  • †Docodon victor – type locality for species
• †Dolichobrachium – type locality for genus
  • †Dolichobrachium gracile – type locality for species

• 

  Mounted fossilized skeleton of the Late Cretaceous plesiosaur Dolichorhynchops

  †Dolichorhynchops
  • †Dolichorhynchops osborni
• †Dombeyopsis
  • †Dombeyopsis colgatensis
  • †Dombeyopsis obtusa
  • †Dombeyopsis platanoides
  • †Dombeyopsis trivialis
• †Doratodon – tentative report
• †Dorsetisaurus
• †Dosiniopsis
  • †Dosiniopsis deweyi
• †Drepanocheilus
  • †Drepanocheilus evansi
  • †Drepanocheilus nebrascensis
  • †Drepanocheilus obesus
  • †Drepanocheilus scotti – or unidentified comparable form
• †Drinker – type locality for genus
  • †Drinker nisti – type locality for species

• 

  Life restoration of the Late Cretaceous "raptor" Dromaeosaurus

  †Dromaeosaurus
• †Dryandroides
  • †Dryandroides lanceolata
• †Dryolestes – type locality for genus
  • †Dryolestes priscus – type locality for species
  • †Dryolestes vorax
• †Dryophyllum – type locality for genus
  • †Dryophyllum lanceolatum
  • †Dryophyllum polymorphum – type locality for species
  • †Dryophyllum subfalcatum
• Dryopteris
  • †Dryopteris coloradensis
• †Dryosaurus
  • †Dryosaurus altus – type locality for species
• †Dryptosaurus – or unidentified comparable form
• †Dunveganoceras
  • †Dunveganoceras pondi
  • †Dunveganoceras problematicum
• †Dyslocosaurus – type locality for genus
  • †Dyslocosaurus polyonychius – type locality for species

E

• †Echidnocephalus – tentative report
• †Edmontonia
  • †Edmontonia rugosidens – or unidentified comparable form
• †Edmontosaurus

  • 

    Life restoration of the Late Cretaceous duck-billed dinosaur Edmontosaurus annectens

    †Edmontosaurus annectens – type locality for species
• †Egertonodus
• †Elaphrosaurus – tentative report
• †Elasmosaurus
• †Elatides
• †Ellipsoscapha
  • †Ellipsoscapha occidentalis
• †Emarginachelys
• †Empo
• †Enneabatrachus – type locality for genus
  • †Enneabatrachus hechti – type locality for species
• Entalis
  • †Entalis paupercula – tentative report
• †Entalophora
  • †Entalophora stokesi – type locality for species
• †Eobatrachus – type locality for genus
  • †Eobatrachus agilis – type locality for species
• †Eocephalites
  • †Eocephalites primus
• †Eokainaster – type locality for genus
  • †Eokainaster pewei

• 

  Fossilized skeleton of the Eocene-Pliocene frog Eopelobates

  †Eopelobates
• †Equisetites
• †Equisetum
  • †Equisetum FF014 – informal
  • †Equisetum RS016 – informal
  • †Equisetum virginicum
• †Essonodon
  • †Essonodon browni
• †Estescincosaurus – type locality for genus
  • †Estescincosaurus cooki – type locality for species
• †Eubaena – type locality for genus
  • †Eubaena cephalica – type locality for species

• 

  Fossilized shell of the Late Cretaceous ammonoid cephalopod Eubostrychoceras

  †Eubostrychoceras
  • †Eubostrychoceras matsumotoi – type locality for species
• †Eubrachiosaurus – type locality for genus
  • †Eubrachiosaurus browni – type locality for species
• †Eucalycoceras
  • †Eucalycoceras templetonense
• †Eucrossorhinus
  • †Eucrossorhinus microcuspidatus
• †Eumorphotis
  • †Eumorphotis multiformis
• †Euomphaloceras
  • †Euomphaloceras merewetheri
• †Eurysalenia
  • †Eurysalenia minima
• †Euspira
  • †Euspira obliquata
• †Euthlastus – type locality for genus
  • †Euthlastus cordiformis – type locality for species

• 

  Illustration in multiple views of a fossilized shell of the Late Jurassic-Miocene nautiloid cephalopod Eutrephoceras

  †Eutrephoceras
  • †Eutrephoceras montanaense
• †Eutretauranosuchus
  • †Eutretauranosuchus delfsi
• †Exiteloceras
  • †Exiteloceras jenneyi
• †Exogyra
  • †Exogyra costata
• †Exostinus – type locality for genus
  • †Exostinus lancensis – type locality for species

F

• †Falepetrus
  • †Falepetrus barwini – type locality for species

• 

  Shell of a Fasciolaria, or tulip sea snail

  Fasciolaria
  • †Fasciolaria flexicostata – tentative report
• †Feistmantelia – type locality for genus
  • †Feistmantelia oblonga – type locality for species
• †Ficophyllum
  • †Ficophyllum serratum
• Ficus
  • †Ficus fremonti
  • †Ficus Fremontii
  • †Ficus inaequalis
  • †Ficus paryearensis
  • †Ficus planicosta
  • †Ficus planicostata
  • †Ficus rockvalensis
  • †Ficus trinervis
• †Filicites
  • †Filicites knowltoni
• †Forresteria
  • †Forresteria stantoni

• 

  Known material diagram of the Late Jurassic ceratosaur Fosterovenator

  †Fosterovenator – type locality for genus
  • †Fosterovenator churei – type locality for species
• †Foxraptor – type locality for genus
  • †Foxraptor atrox – type locality for species
• †Fraxinus
  • †Fraxinus denticulata
  • †Fraxinus leii

G

• 

  Fossilized skull of the Late Jurassic long-necked dinosaur Galeamopus

  †Galeamopus
  • †Galeamopus hayi
  • †Galeamopus pabsti – type locality for species
• †Gargoyleosaurus
  • †Gargoyleosaurus parkpinorum
• †Geinitzia
  • †Geinitzia Jenneyi – type locality for species
• †Geonomites
  • †Geonomites schimperi
• Gerrhonotus – or unidentified comparable form
• †Gervillaria
  • †Gervillaria montanaensis
• †Gervillia
  • †Gervillia dolabrata
  • †Gervillia ussurica – or unidentified comparable form
• †Gilmoremys
  • †Gilmoremys lancensis – type locality for species
• Ginglymostoma
  • †Ginglymostoma globidens

• 

  Fossilized leaf of the Permian-modern tree Ginkgo

  Ginkgo
  • †Ginkgo adiantoides – tentative report
• †Glasbius
  • †Glasbius intricatus – type locality for species
• †Gleichenites
  • †Gleichenites sepulta
• †Glyptops – type locality for genus
  • †Glyptops pervicax
  • †Glyptops plicatulus – type locality for species
• Glyptostrobus
  • †Glyptostrobus brookensis

• 

  Mounted fossilized skeleton of the Middle Jurassic-Late Cretaceous mammal Gobiconodon

  †Gobiconodon
  • †Gobiconodon ostromi
• †Goniomya
  • †Goniomya montanaensis
• †Goniopholis
• †Gracilimanus
  • †Gracilimanus obscurus
• †Grammatodon
  • †Grammatodon haguei
• †Graphidula
  • †Graphidula alleni – or unidentified comparable form

  • 

    Interior and exterior of a fossilized shell of the Late Triassic-Eocene marine bivalve Gryphaea

    †Graphidula culbertsoni
• †Grewiopsis
  • †Grewiopsis saportana
• †Gryphaea
  • †Gryphaea nebrascensis
  • †Gryphaea planoconvexa
• †Gypsonictops
  • †Gypsonictops hypoconus – type locality for species
  • †Gypsonictops lewisi
• †Gypsonicus
  • †Gypsonicus wyomingensis

H

• †Habrosaurus – type locality for genus
  • †Habrosaurus dilatus – type locality for species
• †Hadrosauropodus
• †Halymenites
  • †Halymenites major
• †Hamites
  • †Hamites cimarronensis
  • †Hamites novimexicanus
  • †Hamites salebrosus

• 

  Life restoration of the Late Jurassic sauropod dinosaur Haplocanthosaurus

  †Haplocanthosaurus
• †Haptosphenus – type locality for genus
  • †Haptosphenus placodon – type locality for species
• †Haresiceras
  • †Haresiceras natronense
• †Harpactognathus – type locality for genus
  • †Harpactognathus gentryii – type locality for species
• †Hatcheritherium – type locality for genus
  • †Hatcheritherium alpha – type locality for species
• †Hausmannia
  • †Hausmannia AF017
• †Helopanoplia
  • †Helopanoplia distincta
• Hemiaster
  • †Hemiaster humphreysanus

• 

  Known material diagram of the Middle-Late Triassic distant crocodilian relative Heptasuchus

  †Heptasuchus – type locality for genus
  • †Heptasuchus clarki – type locality for species
• †Herpetarius
  • †Herpetarius humilis
• †Hesperornithoides – type locality for genus
  • †Hesperornithoides miessleri – type locality for species
• †Hesperosaurus – type locality for genus
  • †Hesperosaurus mjosi – type locality for species
• †Heteroceras
  • †Heteroceras cochleatum – tentative report
• †Homomya
  • †Homomya gallatinensis
• †Hoploscaphites
  • †Hoploscaphites birkelundae – type locality for species
  • †Hoploscaphites gilli
  • †Hoploscaphites macer
  • †Hoploscaphites nodosus
  • †Hoploscaphites plenus
  • †Hoploscaphites quadrangularis
• †Hummelichelys
  • †Hummelichelys beecheri – type locality for species

• 

  Life restoration of the Late Triassic rhynchosaur Hyperodapedon

  †Hybodus
  • †Hybodus montanensis
  • †Hybodus wyomingensis – type locality for species
• †Hyperodapedon
  • †Hyperodapedon sanjuanensis – or unidentified comparable form
• †Hypotodus
  • †Hypotodus grandis
• †Hypsodon – tentative report
  • †Hypsodon radiatulus

I

• 

  Life restoration of the Late Cretaceous bony fish Ichthyodectes

  †Ichthyodectes
• †Icthyodectes – tentative report
• †Icthyodesctes – tentative report
• †Idiohamites
  • †Idiohamites bispinosus
• †Iguanavus
  • †Iguanavus teres – type locality for species

• 

  Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size

  †Inoceramus
  • †Inoceramus agdjakendensis – or unidentified comparable form
  • †Inoceramus americanus – type locality for species
  • †Inoceramus anglicus
  • †Inoceramus balchii
  • †Inoceramus barabini
  • †Inoceramus crispii
  • †Inoceramus deformis
  • †Inoceramus dimidius
  • †Inoceramus erectus – or unidentified related form
  • †Inoceramus fibrosus
  • †Inoceramus fragilis – or unidentified related form
  • †Inoceramus gibbosus
  • †Inoceramus glacierensis
  • †Inoceramus grandis
  • †Inoceramus incurvus
  • †Inoceramus lundbreckensis
  • †Inoceramus perplexus
  • †Inoceramus prefragilis
  • †Inoceramus proximus – or unidentified related form
  • †Inoceramus sagensis
  • †Inoceramus subcircularis
  • †Inoceramus subcompressus
  • †Inoceramus sublaevis
  • †Inoceramus tenuirostratus
  • †Inoceramus tenuiumbonatus – or unidentified comparable form
  • †Inoceramus turgidus – or unidentified related form
  • †Inoceramus typicus
  • †Inoceramus umbonatus
  • †Inoceramus undabundus
• †Ischyrhiza

  • 

    Fossilized shell of the Permian-modern marine bivalve Isognomon

    †Ischyrhiza avonicola – type locality for species
  • †Ischyrhiza basinensis – type locality for species
  • †Ischyrhiza mira
• Isocrinus
  • †Isocrinus knighti
  • †Isocrinus wyomingensis
• †Isocyprina
  • †Isocyprina cinnabarensis
• Isognomon
  • †Isognomon perplana – or unidentified comparable form
• Isurus – tentative report

J

Fossilized shell of the Late Cretaceous ammonoid cephalopod Jeletzkytes

• †Janumys
• †Jeletzkytes
  • †Jeletzkytes dorfi – type locality for species
• †Jensensispermum
• †Judithemys
  • †Judithemys backmani

K

Diagram illustrating the size of the Late Jurassic long-necked dinosaur Kaatedocus with an anachronistic human to scale

• †Kaatedocus – type locality for genus
  • †Kaatedocus siberi – type locality for species
• †Koskinonodon – type locality for genus
  • †Koskinonodon perfectus – type locality for species

L

• †Lamarqueavis
  • †Lamarqueavis minima – type locality for species
  • †Lamarqueavis petra – type locality for species
• †Lamiasaura – type locality for genus
  • †Lamiasaura ferox – type locality for species
• †Lanceosaurus – type locality for genus
  • †Lanceosaurus compressus – type locality for species
  • †Lanceosaurus hatcheri – type locality for species
• †Laolestes – type locality for genus
  • †Laolestes eminens – type locality for species
  • †Laolestes goodrichi – type locality for species
  • †Laolestes oweni – type locality for species
• †Laopteryx – type locality for genus
  • †Laopteryx priscus – type locality for species
• †Laosaurus – type locality for genus
  • †Laosaurus celer – type locality for species
• †Laurophyllum
  • †Laurophyllum coloradensis
  • †Laurophyllum meeki
  • †Laurophyllum salicifolium
  • †Laurophyllum wardiana
• Laurus
  • †Laurus aspensis – type locality for species
• †Lepidotes – or unidentified related form
• Lepisosteus
  • †Lepisosteus occidentalis
• †Leptalestes
  • †Leptalestes cooki – type locality for species
  • †Leptalestes krejcii

• 

  Life restoration of the Late Cretaceous primitive horned dinosaur Leptoceratops

  †Leptoceratops
  • †Leptoceratops gracilis
• †Leptochamops
  • †Leptochamops denticulatus – type locality for species
  • †Leptochamops thrinax
• †Leptochondria
  • †Leptochondria occidanea
• †Leptostrobus
  • †Leptostrobus alatus – type locality for species
  • †Leptostrobus longifolia
  • †Leptostrobus longifolius
• †Lesterwardia – type locality for genus
  • †Lesterwardia palustris – type locality for species
• †Leucichthyops
  • †Leucichthyops vagans
• †Leucicthyops
  • †Leucicthyops vagans
• Lima
  • †Lima occidentalis
• Lingula
  • †Lingula nitida – or unidentified comparable form
• †Lingularia
  • †Lingularia borealis
• †Lioplacodes – or unidentified comparable form
• †Liostrea
  • †Liostrea strigilecula
• Liquidambar
  • †Liquidambar fontanella – type locality for species
• †Lisserpeton
  • †Lisserpeton bairdi

• 

  Electron micrograph of fossilized teeth from the Early Jurassic-Early Cretaceous freshwater shark Lissodus

  †Lissodus
  • †Lissodus griffisi – type locality for species
• †Litakis – type locality for genus
  • †Litakis gilmorei – type locality for species
• †Lonchidion – type locality for genus
  • †Lonchidion selachos – type locality for species
• †Lonchisaurus – type locality for genus
  • †Lonchisaurus trichurus – type locality for species
• †Lonchodytes – type locality for genus
  • †Lonchodytes estesi – type locality for species
  • †Lonchodytes pterygius – type locality for species
• †Lophochelys

• 

  A living Lunatia moon sea snail

  Lucina
  • †Lucina mattiformis – or unidentified comparable form
  • †Lucina occidentalis
  • †Lucina subundata
• Lunatia – tentative report
• Lygodium
  • †Lygodium AF030 – informal
• †Lyosoma
  • †Lyosoma powelli

M

• 

  Diagram illustrating the known fossil material of two specimens of the Late Jurassic crocodile relative Macelognathus

  †Macelognathus – type locality for genus
  • †Macelognathus vagans – type locality for species
• Mactra
  • †Mactra emmonsi
• †Mactromya – tentative report
• †Magadiceramus
  • †Magadiceramus soukupi
  • †Magadiceramus subquadratus
• †Magnoliophyllum
  • †Magnoliophyllum cordatum
• †Malapoenna
  • †Malapoenna weediana – tentative report
• Malletia
  • †Malletia stephensoni
• †Manihotites
  • †Manihotites georgiana
• †Martinectes
  • †Martinectes bonneri – type locality for species
• †Matonidium
  • †Matonidium Althaausii
  • †Matonidium Althausii
• †Mecochirus

• 

  Life restoration of the Late Jurassic plesiosaur Megalneusaurus

  †Megalneusaurus
  • †Megalneusaurus rex – type locality for species
• †Megasphaeroceras
  • †Megasphaeroceras rotundum – or unidentified comparable form
• †Meleagrinella
  • †Meleagrinella curta
• †Melvius
  • †Melvius thomasi
• †Meniscoessus
  • †Meniscoessus gracilis – type locality for species
  • †Meniscoessus intermedius
  • †Meniscoessus robustus – type locality for species
  • †Meniscoessus seminoensis – type locality for species
• †Meniscognathus – type locality for genus
  • †Meniscognathus altmani – type locality for species
• †Menispermites
  • †Menispermites belli
  • †Menispermites cockerelli
  • †Menispermites knightii

• 

  Assemblage of fossilized shells of the Late Cretaceous ammonoid cephalopod Menuites

  †Menuites
  • †Menuites complexus
• †Mesembrioxylon
• †Mesodma
  • †Mesodma formosa
  • †Mesodma hensleighi
  • †Mesodma primaeva
  • †Mesodma thompsoni – type locality for species
• †Metaptychoceras
• †Metoicoceras
  • †Metoicoceras geslinianum
  • †Metoicoceras mosbyense – or unidentified comparable form
  • †Metoicoceras praecox
• †Micrabacia
  • †Micrabacia radiata
• †Microtaenia
  • †Microtaenia paucifolia
  • †Microtaenia variabilis

• 

  Life restoration of the Early Cretaceous oviraptorosaur Microvenator

  †Microvenator
  • †Microvenator celer
• †Minerisporites
  • †Minerisporites pseudorichardsonii
• Modiolus
  • †Modiolus meekii
  • †Modiolus subimbricatus
• †Montania – type locality for genus
  • †Montania glandulosa – type locality for species
• †Moremanoceras
  • †Moremanoceras costatum
  • †Moremanoceras scotti
• †Moriconia
  • †Moriconia cyclotoxon
• †Morosaurus
• †Myalina
  • †Myalina postcarbonica
• †Myledaphus
  • †Myledaphus bipartitus

• 

  Fossilized shell of the Jurassic-Cretaceous marine bivalve Myophorella

  †Myophorella
  • †Myophorella yellowstonensis
• Myrica
  • †Myrica bolanderi – tentative report
  • †Myrica nervosa
• †Myrtophyllum
  • †Myrtophyllum torreyi
• †Mytiloides
  • †Mytiloides stantoni
• †Mytilus
  • †Mytilus whitei

N

• †Nageiopsis
  • †Nageiopsis angustifolia
  • †Nageiopsis longifolia
• †Nanocuris
  • †Nanocuris improvida
• †Nanomyops
• †Nanosaurus
  • †Nanosaurus rex
• †Nanotyrannus – tentative report
• †Naomichelys
  • †Naomichelys speciosa

• 

  A living Nelumbo lotus

  †Nelumbo
  • †Nelumbo weymouthi – type locality for species
  • †Nelumbo weymouthii
• †Nemocardium
  • †Nemocardium parahillanum
• †Nemodon
  • †Nemodon eufalensis
  • †Nemodon grandis
• †Neocardioceras
  • †Neocardioceras laevigatum – type locality for species
  • †Neocardioceras minutum – type locality for species
  • †Neocardioceras transiens
  • †Neocardioceras uptonense – type locality for species
• †Neogastroplites
  • †Neogastroplites wyomingensis
• †Neonereites – or unidentified comparable form
  • †Neonereites biserialis
• †Neoplagiaulax
• †Neoschizodus
  • †Neoschizodus laevigatus
• †Nerinea – tentative report
• †Neurankylus
  • †Neurankylus wyomingensis – type locality for species
• †Nilsonia
  • †Nilsonia mehli
  • †Nilsonia nigricollensis
• Nodosaria

• 

  Historical reconstruction of the holotype skeleton from 1921

  †Nodosaurus – type locality for genus
  • †Nodosaurus textilis – type locality for species
• †Nonactaeonina
  • †Nonactaeonina attenuata
• †Normannites – tentative report
  • †Normannites crickmayi – or unidentified comparable form
• †Nortedelphys
  • †Nortedelphys jasoni
  • †Nortedelphys magnus
  • †Nortedelphys minimus

• 

  Interior of a fossilized shell of the Early Ordovician-modern marine bivalve Nucula

  Nucula
  • †Nucula cancellata
  • †Nucula nacatochana
  • †Nucula planimarginata
• Nuculana
  • †Nuculana bisulcata
  • †Nuculana corsicana
  • †Nuculana equilateralis – tentative report
  • †Nuculana evansi
  • †Nuculana pittensis
• †Nymphaeites
  • †Nymphaeites dawsoni

O

• †Obamadon
  • †Obamadon gracilis
• †Obnixia – type locality for genus
  • †Obnixia thaynesiana
• †Odaxosaurus – type locality for genus
  • †Odaxosaurus piger – type locality for species

• 

  A living Odontaspis sand shark

  Odontaspis
  • †Odontaspis cheathami – type locality for species
  • †Odontaspis steineri – type locality for species
• †Oklatheridium
  • †Oklatheridium wiblei
• †Oligoptycha
  • †Oligoptycha concinna
• †Omasaria
• †Onoclea
  • †Onoclea minima
• †Opertochasma
• †Ophiopsis
• †Ophthalmosaurus
  • †Ophthalmosaurus natans
• †Opisthias
  • †Opisthias rarus – type locality for species
• †Opisthotriton
  • †Opisthotriton kayi

• 

  Mounted fossilized skeleton of the Late Jurassic theropod dinosaur Ornitholestes

  †Ornitholestes – type locality for genus
  • †Ornitholestes hermanni – type locality for species
• †Ornithomimus
  • †Ornithomimus minutus
  • †Ornithomimus sedens – type locality for species
  • †Ornithomimus velox – or unidentified comparable form
• †Orthotrigonia
  • †Orthotrigonia sohli – tentative report
• †Osmakasaurus – tentative report
  • †Osmakasaurus depressus

• 

  Mounted fossilized skeleton of the Late Jurassic herbivorous dinosaur Othnielosaurus

  Ostrea
  • †Ostrea inornata
• †Othnielia
• †Othnielosaurus
  • †Othnielosaurus consors – type locality for species
• †Oxybeloceras
  • †Oxybeloceras crassum
• †Oxytoma
  • †Oxytoma nebrascana

P

• 

  Fossilized skeleton of the Late Cretaceous dome-headed dinosaur Pachycephalosaurus

  †Pachycephalosaurus
  • †Pachycephalosaurus wyomingensis – type locality for species
• †Pachyrhizodus
• †Pachyteuthis
  • †Pachyteuthis densus
• †Palaeoaster
  • †Palaeoaster inquirenda
• †Palaeobatrachus
  • †Palaeobatrachus occidentalis – type locality for species
• †Palaeocypraea
  • †Palaeocypraea squyeri – type locality for species
• †Palaeosaniwa – type locality for genus
  • †Palaeosaniwa canadensis – type locality for species
• †Paleoaster
  • †Paleoaster inquirenda
• †Paleopsephurus
  • †Paleopsephurus wilsoni
• †Paleorhinus
  • †Paleorhinus parvus – type locality for species
• †Paliurus
  • †Paliurus minimus
  • †Paliurus zizyphoides – tentative report
• †Pantosaurus – type locality for genus
  • †Pantosaurus striatus – type locality for species
• †Parachondroceras
  • †Parachondroceras andrewsi
  • †Parachondroceras filicostatum
• †Paracimexomys
  • †Paracimexomys priscus
• †Paracredneria
  • †Paracredneria cretacea – type locality for species
• †Paraderma – type locality for genus
  • †Paraderma bogerti – type locality for species
• †Paradiscoglossus – type locality for genus
  • †Paradiscoglossus americanus – type locality for species
• †Paralbula
  • †Paralbula casei
• †Paramacellodus
  • †Paramacellodus keebleri
• †Paranymphaea
  • †Paranymphaea hastata
• †Parasaniwa – type locality for genus
  • †Parasaniwa wyomingensis – type locality for species
• †Parastomechinus
  • †Parastomechinus brightoni

• 

  Life restoration of the Late Triassic phytosaur Parasuchus

  †Parasuchus
  • †Parasuchus bransoni – type locality for species
• †Paressonodon
  • †Paressonodon nelsoni
• †Pariguana – type locality for genus
  • †Pariguana lancensis – type locality for species
• †Parikimys
  • †Parikimys carpenteri
• †Parmicorbula
  • †Parmicorbula bisulcata
• †Paronychodon
  • †Paronychodon lacustris – type locality for species
• †Parvodus
• †Paurodon – type locality for genus
  • †Paurodon valens – type locality for species
• †Pecopteris
  • †Pecopteris borealis
  • †Pecopteris Geyleriana
• Pecten
  • †Pecten nebrascensis

• 

  Micrograph of a fossilized tooth of the Late Cretaceous troodontid Pectinodon

  †Pectinodon – type locality for genus
  • †Pectinodon bakkeri – type locality for species
• †Pediomys
  • †Pediomys elegans – type locality for species
• †Pentacrinus
• †Permophorus
  • †Permophorus triassicus – type locality for species
• Persea – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Persea hayana
• †Petalolepis – tentative report
  • †Petalolepis fibrillatus
• †Phlycticrioceras
  • †Phlycticrioceras trinodosus
• †Phoenicites – or unidentified comparable form

• 

  Fossilized shell of the Early Triassic-Pliocene marine bivalve Pholadomya

  Pholadomya
  • †Pholadomya inaequiplicata
  • †Pholadomya kingi
• †Phragmites
  • †Phragmites falcata
• †Phyllites
  • †Phyllites crassipes
  • †Phyllites cretaceous
  • †Phyllites dentata
  • †Phyllites ficifolius
  • †Phyllites grandifolius-cretaceous
• Phyllodus
  • †Phyllodus toliapicus

• 

  A live individual of Physa marmorata

  Physa – or unidentified comparable form
• †Piceoerpeton
  • †Piceoerpeton naylori
• Pinna
  • †Pinna kingi
• Pinus
  • †Pinus susquaensis
• Pistacia
  • †Pistacia eriensis
• †Pistia
  • †Pistia corrugata

• 

  Fossilized shell of the Late Cretaceous ammonoid cephalopod Placenticeras

  †Placenticeras
  • †Placenticeras intercalare
  • †Placenticeras meeki
  • †Placenticeras pseudoplacenta
• †Plagiostoma
  • †Plagiostoma occidentalis
• Planorbis
• †Plastomenus
• †Platacodon – type locality for genus
  • †Platacodon nanus – type locality for species
• †Platanites
  • †Platanites marginata
• †Platanophyllum
  • †Platanophyllum montanum
  • †Platanophyllum platanoides
• Platanus
  • †Platanus primaeva

• 

  Life restoration of the Late Cretaceous mosasaur Platecarpus

  †Platecarpus
  • †Platecarpus brachycephalus
  • †Platecarpus tympaniticus
• †Platymya
  • †Platymya rockymontana
• †Platypterygius
  • †Platypterygius americanus – type locality for species
• †Plesiacanthoceras
  • †Plesiacanthoceras bellsanum – or unidentified comparable form
  • †Plesiacanthoceras wyomingense
• †Plesiobaena
  • †Plesiobaena antiqua

• 

  Life restoration of the Late Cretaceous plesiosaur Plesiopleurodon

  †Plesiopleurodon – type locality for genus
  • †Plesiopleurodon wellesi – type locality for species
• †Plesiosaurus
  • †Plesiosaurus shirleyensis – type locality for species
• †Pleuromya
  • †Pleuromya haydeniana – type locality for species
  • †Pleuromya subcompressa
• †Plicatolamna
  • †Plicatolamna arcuata
• Plicatula
• Polinices
  • †Polinices concinna – or unidentified related form
• †Polyacrodus
  • †Polyacrodus parvidens – or unidentified comparable form
• †Polycotylus

• 

  Restoration of the Late Triassic crocodile relative Poposaurus with an anachronistic human to scale

  †Poposaurus – type locality for genus
  • †Poposaurus gracilis – type locality for species
• Populus
  • †Populus aspens
  • †Populus aspensis – type locality for species
• †Porosoma
  • †Porosoma reesidei – type locality for species
• †Portheus
• †Postligata
  • †Postligata crenata
• †Potamoceratodus
• †Potamornis – type locality for genus
  • †Potamornis skutchi – type locality for species
• †Powellia – type locality for genus
  • †Powellia oblongata – type locality for species
• †Priacodon
  • †Priacodon ferox – type locality for species
  • †Priacodon grandaevus – type locality for species
  • †Priacodon lulli – type locality for species
  • †Priacodon robustus – type locality for species
• †Prionocyclus
  • †Prionocyclus germari
  • †Prionocyclus hyatti
  • †Prionocyclus novimexicanus
• †Prodesmodon – type locality for genus
  • †Prodesmodon copei – type locality for species
• †Prodiplocynodon – type locality for genus
  • †Prodiplocynodon langi – type locality for species
• †Promyalina
  • †Promyalina putiatinensis
  • †Promyalina spathi
• †Pronoella
  • †Pronoella cinnabarensis
  • †Pronoella iddingsi – or unidentified comparable form
  • †Pronoella uintahensis
• †Prorokia
  • †Prorokia fontenellensis
• †Protalphadon
  • †Protalphadon lulli – type locality for species
• †Protexanites
  • †Protexanites bourgeoisianus
• †Protocardia
  • †Protocardia rara
  • †Protocardia schucherti – or unidentified comparable form
• †Protolambda
  • †Protolambda florencae – type locality for species
  • †Protolambda hatcheri
• †Protophyllocladus
  • †Protophyllocladus subintegrifolius
• †Protophyllum
• †Protoplatyrhina
  • †Protoplatyrhina renae

• 

  Fossilized mandible of the Late Cretaceous-Paleocene mammal Protungulatum

  †Protungulatum – tentative report
• Prunus
  • †Prunus aspensis – type locality for species
• †Psalodon
  • †Psalodon fortis – type locality for species
  • †Psalodon marshi – type locality for species
  • †Psalodon potens – type locality for species
• †Pseudoctenis
  • †Pseudoctenis AF013 – informal
• †Pseudodontaspis – type locality for genus
  • †Pseudodontaspis herbsti – type locality for species
• †Pseudoperna
  • †Pseudoperna congesta
• †Pteraichnus
  • †Pteraichnus stokesi – type locality for species

• 

  Life restoration of the Late Cretaceous pterosaur Pteranodon

  †Pteranodon
  • †Pteranodon longiceps
• †Pteria
  • †Pteria gastrodes
  • †Pteria linguaeformis
  • †Pteria linguiformis
  • †Pteria lingulaeformis
  • †Pteria ussurica – or unidentified comparable form
• †Pterodactylus
  • †Pterodactylus montanus – type locality for species
• †Ptilotodon
  • †Ptilotodon wilsoni
• †Ptychodous
• †Ptychotrygon
  • †Ptychotrygon boothi – type locality for species
  • †Ptychotrygon ellae – type locality for species
  • †Ptychotrygon greybullensis – type locality for species

Q

• †Quenstedtia
  • †Quenstedtia sublevis

  • 

    A living Quercus, or oak tree

    †Quenstedtia sublewis
• †Quercophyllum
  • †Quercophyllum gardneri
  • †Quercophyllum wyomingense – type locality for species
• Quercus
  • †Quercus ellisiana
  • †Quercus stantoni
  • †Quercus stantonii
  • †Quercus viburnifolia
• †Quereuxia
  • †Quereuxia angulata

R

• †Raninella
• †Reesidella
• †Retinovena – type locality for genus
  • †Retinovena fluvialis – type locality for species
• †Retispira
  • †Retispira bittneri
• Rhabdocolpus – tentative report
• †Rhaeboceras
  • †Rhaeboceras halli
  • †Rhaeboceras subglobosum
• †Rhamnus

  • 

    Micrograph with magnified inset of a fossilized tooth of the Late Cretaceous theropod dinosaur Richardoestesia

    †Rhamnus hirsuta
  • †Rhamnus minutus
• Rhinobatos
  • †Rhinobatos casieri
• †Rhizocorallium
• †Rhynchosauroides – type locality for genus
  • †Rhynchosauroides palmatus – type locality for species
• †Richardoestesia
  • †Richardoestesia isosceles
• †Ropalonaria
  • †Ropalonaria arachne
• Rostellaria – tentative report
• †Rotodactylus – or unidentified comparable form

S

• †Sabalites
  • †Sabalites eocenica
  • †Sabalites montana
• †Saccoloma – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Saccoloma gardneri
• †Saliciphyllum
  • †Saliciphyllum wyomingensis

• 

  A living Salix, or willow

  Salix
  • †Salix cumberlandensis
  • †Salix frontierensis
  • †Salix lancensis
• †Salpichlaena
  • †Salpichlaena AF003 – informal
• †Sapindopsis
  • †Sapindopsis belviderensis
  • †Sapindopsis magnifolia
  • †Sapindopsis schultzi – type locality for species
  • †Sapindopsis schultzii
  • †Sapindopsis variabilis
• †Sarjeantopodus – type locality for genus
  • †Sarjeantopodus semipalmatus – type locality for species

• 

  Foliage of a living Sassafras tree

  Sassafras
  • †Sassafras bradleyi – type locality for species
  • †Sassafras bradleyii
  • †Sassafras thermale
• †Saurexallopus – type locality for genus
  • †Saurexallopus lovei – type locality for species
  • †Saurexallopus zerbsti – type locality for species
• †Saurocephalus
• †Saurolophus
• †Sauropelta
  • †Sauropelta edwardsorum

• 

  Diagram illustrating the Early Cretaceous long-necked dinosaur Sauroposeidon with anachronistic humans to scale

  †Sauroposeidon
  • †Sauroposeidon proteles
• †Saurornithoides – or unidentified comparable form
• †Saurornitholestes
• †Sauvagesia
  • †Sauvagesia austinensis – or unidentified comparable form
• †Scapanorhynchus
  • †Scapanorhynchus texanus
• †Scapherpeton
  • †Scapherpeton tectum

• 

  Fossilized shell of the Late Cretaceous ammonoid cephalopod Scaphites

  †Scaphites
  • †Scaphites aquilaensis
  • †Scaphites binneyi
  • †Scaphites hippocrepis
  • †Scaphites stantoni
  • †Scaphites ventricosus
  • †Scaphites whitfieldi
• †Scleropteris
  • †Scleropteris distantifolia – type locality for species
  • †Scleropteris rotundifolia – type locality for species
• †Scotiophryne
  • †Scotiophryne pustulosa
• Scyliorhinus
  • †Scyliorhinus tensleepensis – type locality for species
• †Selaginella
  • †Selaginella falcata – tentative report
• †Semiungula – type locality for genus
  • †Semiungula assymetrica – type locality for species

• 

  Base of the trunk of a living Sequoia tree with a human to scale

  Sequoia
  • †Sequoia cuneata
  • †Sequoia dakotensis
  • †Sequoia gracilia
  • †Sequoia gracilis
  • †Sequoia langsdorfii
  • †Sequoia reichenbachi
  • †Sequoia Reichenbachi
• †Serrifusus
  • †Serrifusus dakotensis
• †Skolithos
• †Smilax
  • †Smilax coloradensis – tentative report
• †Socognathus
  • †Socognathus brachyodon – type locality for species
• †Sohlites
  • †Sohlites spinosus
• †Sokophyllum – type locality for genus
  • †Sokophyllum dentatum – type locality for species

• 

  Modern specimen of the marine bivalve Solemya

  Solemya
  • †Solemya bilix
  • †Solemya obscura
• †Solenoceras
• †Solyma
• †Sparganium
  • †Sparganium aspens
  • †Sparganium aspensis – type locality for species
• Sphaerium – or unidentified comparable form
• †Sphenodiscus
  • †Sphenodiscus lobatus – or unidentified comparable form
  • †Sphenodiscus pleurisepta
• †Sphenolepidium
  • †Sphenolepidium Kurrianum
  • †Sphenolepidium parceramosum
• †Sphenopteris
  • †Sphenopteris plurinervia
• †Spiroceras
  • †Spiroceras orbignyi – or unidentified comparable form

• 

  Fossilized tooth of the Late Cretaceous shark Squalicorax

  Squalicorax
  • †Squalicorax kaupi
  • †Squalicorax pristodontus
• †Squatirhina
  • †Squatirhina americana – type locality for species
  • †Squatirhina roessingi – type locality for species
• †Staphylea
  • †Staphylea fremonti
  • †Staphylea fremontii
• †Stegopelta – type locality for genus
  • †Stegopelta landerensis – type locality for species

• 

  Restoration of the Late Jurassic stegosaur Stegosaurus

  †Stegosaurus – type locality for genus
  • †Stegosaurus affinis – type locality for species
  • †Stegosaurus armatus – type locality for species
  • †Stegosaurus longispinus – type locality for species
  • †Stegosaurus stenops
  • †Stegosaurus sulcatus – type locality for species
  • †Stegosaurus ungulatus – type locality for species
• †Steinichnus
• †Stemmatoceras
  • †Stemmatoceras albertense – or unidentified related form
• Sterculia
  • †Sterculia mucronata
  • †Sterculia towneri
• †Stokesosaurus – tentative report
  • †Stokesosaurus clevelandi
• †Struthiomimus – or unidentified comparable form

• 

  Restoration in multiple views of the Late Jurassic sauropod dinosaur Supersaurus with an anachronistic human to scale

  †Stygiochelys
• †Styxosaurus
  • †Styxosaurus browni – type locality for species
• †Supersaurus
  • †Supersaurus vivianae
• †Syncyclonema
  • †Syncyclonema rigida
• †Synechodus
  • †Synechodus turneri – type locality for species

T

• †Tancredia
  • †Tancredia transversa

• 

  Life restoration of the Late Jurassic theropod dinosaur Tanycolagreus

  †Tanycolagreus – type locality for genus
  • †Tanycolagreus topwilsoni – type locality for species
• Tapeinidium
  • Tapeinidium undulatum – tentative report
• †Tarrantoceras
  • †Tarrantoceras exile – type locality for species
  • †Tarrantoceras flexicostatum – type locality for species
  • †Tarrantoceras sellardsi
• †Tatenectes
  • †Tatenectes laramiensis – type locality for species
• †Tathiodon – type locality for genus
  • †Tathiodon agilis – type locality for species
• †Telacodon
  • †Telacodon laevis – type locality for species
• †Tenea
  • †Tenea circularis

• 

  Life restoration of the Early Cretaceous Iguanodon relative Tenontosaurus

  †Tenontosaurus
  • †Tenontosaurus tilletti
• Teredo
• †Thalassinoides
• †Theatonius – type locality for genus
  • †Theatonius lancensis – type locality for species
• †Theretairus – type locality for genus
  • †Theretairus antiquus – type locality for species

• 

  Life restoration of the Late Cretaceous herbivorous dinosaur Thescelosaurus

  †Thescelosaurus – type locality for genus
  • †Thescelosaurus neglectus – type locality for species
• †Thescelus
  • †Thescelus insiliens – type locality for species
• †Thoracosaurus – or unidentified comparable form
• Thracia
  • †Thracia weedi
• Thyasira

• 

  Illustration of a living Thyrsopteris tree fern

  †Thyrsopteris
  • †Thyrsopteris brevifolia
  • †Thyrsopteris brevipennis
  • †Thyrsopteris crassinervis
  • †Thyrsopteris dentifolia – type locality for species
  • †Thyrsopteris elliptica
  • †Thyrsopteris pecopteroides
  • †Thyrsopteris pinnatifida
• †Tinodon – type locality for genus
  • †Tinodon bellus – type locality for species
• †Torosaurus – type locality for genus
  • †Torosaurus latus – type locality for species
• †Torotix – type locality for genus
  • †Torotix clemensi – type locality for species

• 

  Mounted fossilized skeleton of the Late Jurassic megalosaur Torvosaurus

  †Torvosaurus – type locality for genus
  • †Torvosaurus tanneri – type locality for species
• †Trachodon
• †Trachyscaphites
  • †Trachyscaphites redbirdensis
• †Trachytriton
  • †Trachytriton vinculum
• †Tragodesmoceras
  • †Tragodesmoceras carlilense
• †Trapa
  • †Trapa microphylla

• 

  Mounted fossilized skeleton of the Late Cretaceous horned dinosaur Triceratops

  †Triceratops – type locality for genus
  • †Triceratops horridus – type locality for species
  • †Triceratops ingens – type locality for species
  • †Triceratops prorsus – type locality for species
  • †Triceratops sulcatus – type locality for species
• †Trigonia
  • †Trigonia americana
  • †Trigonia elegantissima
  • †Trigonia montanaensis
  • †Trigonia quadrangularis
• †Trioracodon
  • †Trioracodon bisulcus – type locality for species

• 

  Fossilized skeleton of the Late Cretaceous tyrannosaur Tyrannosaurus

  Trochocyathus – tentative report
• †Trochodendroides
• †Troodon
  • †Troodon formosus
• †Turgidodon
  • †Turgidodon rhaister – type locality for species
  • †Turgidodon russelli
• Typha
• †Tyrannosaurus – type locality for genus
  • †Tyrannosaurus rex – type locality for species

U

• †Ulmiphyllum
  • †Ulmiphyllum densinerve – type locality for species
• †Uluops – type locality for genus
  • †Uluops uluops – type locality for species
• Unio
• †Unionites
  • †Unionites fassaensis

V

• Vanikoro
  • †Vanikoro ambigua
• †Vanikoropsis
  • †Vanikoropsis nebrascensis
• †Vaugonia

  • 

    Leaves and fruit of a living Vitis, or grapevine

    †Vaugonia conradi
• †Veniella
  • †Veniella mortoni
• †Viburnum
  • †Viburnum marginatum
  • †Viburnum montanum
  • †Viburnum rotundifolium
• Vitis
  • †"Vitis" stantoni
• Viviparus – or unidentified comparable form
• †Volutoderma

W

Living Woodwardia ferns

• †Weediaphyllum – type locality for genus
  • †Weediaphyllum parkensis – type locality for species
• †Weichselia
  • †Weichselia reticulata
• †Williamsonia – tentative report
  • †Williamsonia phoenicopsoides – type locality for species
• †Woodwardia
  • †Woodwardia crenata

X

Life restoration of the Cretaceous bony fish Xiphactinus

• †Xenocephalites
• †Xenoxylon
• †Xiphactinus
  • †Xiphactinus vetus

Y

• Yoldia
  • †Yoldia scitula – or unidentified related form
  • †Yoldia ventricosa

Z

Fossil of the Early Triassic-Eocene cycad-like frond Zamites

• †Zamites
  • †Zamites arcticus
  • †Zamites borealis
  • †Zamites brevipennis
• †Zapsalis – or unidentified comparable form
• †Zephyrosaurus – or unidentified comparable form
• †Zofiabaatar – type locality for genus
  • †Zofiabaatar pulcher – type locality for species

External links

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.