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
  • †Aletridelphys
    • †Aletridelphys florencae – type locality for species
    • †Aletridelphys hatcheri
  • †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
  • †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
  • †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
  • †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 bonneri – type locality for species
    • †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
  • †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
  • †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[1]
    • †Hesperornithoides miessleri – type locality for species[2]
  • †Hesperosaurus – type locality for genus
    • †Hesperosaurus mjosi – type locality for species
  • †Heteroceras
    • †Heteroceras cochleatum – tentative report
  • †Homomya
    • †Homomya gallatinensis
  • †Hoploscaphites[3]
    • †Hoploscaphites birkelundae – type locality for species
    • †Hoploscaphites gilli
    • †Hoploscaphites macer[3]
    • †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
  • †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
  • †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
  • †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

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
gollark: What would a RTOS for CC *do*?
gollark: Badness.
gollark: THERE IS NO ESCAPE.
gollark: There is no escape.
gollark: You cannot.

References
  1. Scott Hartman; Mickey Mortimer; William R. Wahl; Dean R. Lomax; Jessica Lippincott; David M. Lovelace (2019). "A new paravian dinosaur from the Late Jurassic of North America supports a late acquisition of avian flight". PeerJ. 7: e7247. doi:10.7717/peerj.7247. PMC 6626525. PMID 31333906.
  2. Scott Hartman; Mickey Mortimer; William R. Wahl; Dean R. Lomax; Jessica Lippincott; David M. Lovelace (2019). "A new paravian dinosaur from the Late Jurassic of North America supports a late acquisition of avian flight". PeerJ. 7: e7247. doi:10.7717/peerj.7247. PMC 6626525. PMID 31333906.
  3. Neil H. Landman; W. James Kennedy; Neal L. Larson; Joyce C. Grier; James W. Grier; Tom Linn (2019). "Description of two species of Hoploscaphites (Ammonoidea, Ancyloceratina) from the Upper Cretaceous (Lower Maastrichtian) of the U.S. Western Interior". Bulletin of the American Museum of Natural History. 427: 1–72. doi:10.1206/0003-0090.427.1.1. hdl:2246/6926.
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