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
  • †Agerostrea
    • †Agerostrea mesenterica
  • †Agialopous – type locality for genus
    • †Agialopous wyomingensis – type locality for species
  • Restoration of the Cretaceous-Pleistocene amphibian Albanerpeton
    †Albanerpeton
  • †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
  • †Alostera
    • †Alostera saskatchewanensis – type locality for species
  • †Alphadon
  • †Altacreodus
  • †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
  • †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
  • †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
  • †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
  • †Apeibopsis – tentative report
    • †Apeibopsis discolor
  • †Aploconodon – type locality for genus
  • 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
  • †Austrotindaria
    • †Austrotindaria antiqua
    • †Austrotindaria canalensis
    • †Austrotindaria svalbardensis
  • †Avernalia – type locality for genus
    • †Avernalia solida – type locality for species

B

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
  • †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
  • † 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
  • †Ceratodus
  • 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
  • Chlamys
    • †Chlamys nebrascensis
  • †Chondroceras
  • †Cimexomys
  • †Cimolestes
  • †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
  • †Cimolopteryx
  • 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
  • †Claraia
  • †Clemensodon – type locality for genus
  • †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
  • †Collignoniceras
  • †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
  • †Comodon – type locality for genus
  • †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
  • Cossmannea
  • Crassatella
    • †Crassatella evansi
  • †Crassidenticulum
    • †Crassidenticulum aquilae – type locality for species
    • †Crassidenticulum decurrens
  • Crenella
  • †Cretorectolobus
  • †Cryptometoicoceras – type locality for genus
    • †Cryptometoicoceras mite – type locality for species
  • †Cryptorhytis
    • †Cryptorhytis cheyennensis
  • †Ctenacodon – type locality for genus
  • †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

E

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
  • †Gargoyleosaurus
  • †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
  • 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
  • †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

I

J
Fossilized shell of the Late Cretaceous ammonoid cephalopod Jeletzkytes

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

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
  • †Laopteryx – type locality for genus
    • †Laopteryx priscus – type locality for species
  • †Laosaurus – type locality for genus
  • †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
  • Life restoration of the Late Cretaceous primitive horned dinosaur Leptoceratops
    †Leptoceratops
  • †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
  • 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
  • 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
  • †Megasphaeroceras
    • †Megasphaeroceras rotundum – or unidentified comparable form
  • †Meleagrinella
    • †Meleagrinella curta
  • †Melvius
    • †Melvius thomasi
  • †Meniscoessus
  • †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
  • †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
  • †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
  • Fossilized shell of the Jurassic-Cretaceous marine bivalve Myophorella
    †Myophorella
  • 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
  • †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
  • †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
  • †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

P
  • Fossilized skeleton of the Late Cretaceous dome-headed dinosaur Pachycephalosaurus
    †Pachycephalosaurus
  • †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
  • †Paleoaster
    • †Paleoaster inquirenda
  • †Paleopsephurus
  • †Paleorhinus
  • †Paliurus
    • †Paliurus minimus
    • †Paliurus zizyphoides – tentative report
  • †Pantosaurus – type locality for genus
  • †Parachondroceras
    • †Parachondroceras andrewsi
    • †Parachondroceras filicostatum
  • †Paracimexomys
  • †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
  • †Parvodus
  • †Paurodon – type locality for genus
  • †Pecopteris
    • †Pecopteris borealis
    • †Pecopteris Geyleriana
  • Pecten
    • †Pecten nebrascensis
  • Micrograph of a fossilized tooth of the Late Cretaceous troodontid Pectinodon
    †Pectinodon – type locality for genus
  • †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
  • †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
  • †Platymya
    • †Platymya rockymontana
  • †Platypterygius
  • †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
  • †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
  • 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
  • †Powellia – type locality for genus
    • †Powellia oblongata – type locality for species
  • †Priacodon
  • †Prionocyclus
    • †Prionocyclus germari
    • †Prionocyclus hyatti
    • †Prionocyclus novimexicanus
  • †Prodesmodon – type locality for genus
    • †Prodesmodon copei – type locality for species
  • †Prodiplocynodon – type locality for genus
  • †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
  • †Pseudoctenis
    • †Pseudoctenis AF013 – informal
  • †Pseudodontaspis – type locality for genus
    • †Pseudodontaspis herbsti – type locality for species
  • †Pseudoperna
  • †Pteraichnus
  • Life restoration of the Late Cretaceous pterosaur Pteranodon
    †Pteranodon
  • †Pteria
    • †Pteria gastrodes
    • †Pteria linguaeformis
    • †Pteria linguiformis
    • †Pteria lingulaeformis
    • †Pteria ussurica – or unidentified comparable form
  • †Pterodactylus
  • †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
  • †Ropalonaria
    • †Ropalonaria arachne
  • Rostellaria – tentative report
  • †Rotodactylus – or unidentified comparable form

S

T

U
  • †Ulmiphyllum
    • †Ulmiphyllum densinerve – type locality for species
  • †Uluops – type locality for genus
  • 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

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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