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

A

B

C

D

E

F

  • †Falepetrus
    • †Falepetrus barwini
  • Ficus – or unidentified comparable form
    • †Ficus ovatifolia
  • †Fletcherithyris – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Fletcherithyris margaritovi
  • †Foraminisporis
    • †Foraminisporis undulates

G

H

I

J

K

  • †Kastanoceras – type locality for genus
    • †Kastanoceras spiniger – type locality for species
  • †Klukia
    • †Klukia canadensis
  • Life restoration of the Late Cretaceous duck-billed dinosaur Kritosaurus
    †Kritosaurus
    • †Kritosaurus breviceps – or unidentified comparable form
  • †Krokolithes

L

  • †Labrodioctes – type locality for genus
    • †Labrodioctes montanensis – type locality for species
  • †Laevigatosporites
    • †Laevigatosporites haardtii
  • Fossilized skeleton of the Early Jurassic-Late Cretaceous bony fish Lepidotes
    †Lepidotes
  • †Lepismatina – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Lepismatina mansfieldi
  • Lepisosteus
    • †Lepisosteus occidentalis
  • †Leptalestes
  • Life restoration of the Late Cretaceous primitive horned dinosaur Leptoceratops
    †Leptoceratops
  • †Leptochamops
    • †Leptochamops denticulatus
  • †Leptochondria
    • †Leptochondria occidanea
  • †Leptopecopites
    • †Leptopecopites pocockii
  • †Leptorhynchos – tentative report
  • †Lesterwardia – type locality for genus
    • †Lesterwardia palustris – type locality for species
  • †Liliacidites
  • †Lingula
  • †Lingularia
    • †Lingularia borealis
  • †Lioplacodes
    • †Lioplacodes judithensis
    • †Lioplacodes williamsi
  • †Liostrea
    • †Liostrea strigilecula
  • †Lisserpeton – type locality for genus
  • †Lonchidion
    • †Lonchidion selachos
  • Fossilized shell of the Triassic-modern marine bivalve Lopha
    Lopha
  • †Lucina
  • Lunatia
    • †Lunatia dakotensis – or unidentified comparable form
  • †Lygobius – type locality for genus
    • †Lygobius knowltoni – type locality for species

M

N

  • †Nannometoicoceras
    • †Nannometoicoceras nanos – type locality for species
  • Fossilized skull of the Late Cretaceous tyrannosaur Nanotyrannus, possibly a juvenile Tyrannosaurus rather than a distinct genus
    †Nanotyrannus
  • †Naomichelys – type locality for genus
    • †Naomichelys speciosa – type locality for species
  • †Necrocarcinus
  • †Nelumbo
    • †Nelumbo peltata – type locality for species
  • †Neocardioceras
  • †Neogastroplites
    • †Neogastroplites haasi
  • †Neoplagiaulax
  • †Neoschizodus
  • †Neurankylus – type locality for genus
    • †Neurankylus eximius – type locality for species
  • †Nezpercius – type locality for genus
    • †Nezpercius dodsoni – type locality for species
  • †Nidimys – type locality for genus
    • †Nidimys occultus – type locality for species
  • †Nilsonia
    • †Nilsonia compta – or unidentified comparable form
  • †Normannites – tentative report
    • †Normannites crickmayi – or unidentified comparable form
  • †Nortedelphys – type locality for genus
    • †Nortedelphys jasoni – type locality for species
    • †Nortedelphys minimus – type locality for species
  • Fossilized skeleton of the Late Cretaceous-Eocene bony fish Notogoneus
    †Notogoneus
    • †Notogoneus montananesis – type locality for species
    • †Notogoneus montenensis – type locality for species
  • Nucula
  • †Nymphaeites

O

P

  • Life restoration of subadults of the Late Cretaceous dome-headed dinosaur Pachycephalosaurus butting heads
    †Pachycephalosaurus – type locality for genus
  • †Pagiophyllum
  • †Palaeobatrachus
    • †Palaeobatrachus occidentalis
  • †Palaeolabrus
    • †Palaeolabrus montanensis
  • †Palaeosaniwa
  • †Palaeoscincus – type locality for genus
  • †Palatobaena
    • †Palatobaena bairdi
  • †Paleopsephurus – type locality for genus
  • †Paleoungulatum – type locality for genus
    • †Paleoungulatum hooleyi – type locality for species
  • Illustration of a fossilized skull of the Late Cretaceous armored dinosaur Panoplosaurus
    †Panoplosaurus
  • †Pappotherium
    • †Pappotherium pattersoni
  • †Parachondroceras
    • †Parachondroceras andrewsi
    • †Parachondroceras filicostatum
  • †Paracimexomys
  • †Paraderma
    • †Paraderma bogerti
  • †Paralbula
    • †Paralbula casei
  • †Paramacellodus – or unidentified comparable form
    • †Paramacellodus keebleri – type locality for species
  • †Paranecturus – type locality for genus
  • †Paranyctoides
    • †Paranyctoides maleficus
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Parapuzosia with a human indicating its size
    †Parapuzosia
  • †Parasaniwa
    • †Parasaniwa wyomingensis
  • †Parataxodium
  • †Parazolla – type locality for genus
    • †Parazolla heterotricha – type locality for species
  • †Parazollopsis – type locality for genus
    • †Parazollopsis cascadensis – type locality for species
  • †Paronychodon
  • Micrograph of a fossilized tooth of the Late Cretaceous troodontid Pectinodon
    †Pectinodon – or unidentified comparable form
  • †Pediomys
    • †Pediomys elegans
  • †Peneteius – type locality for genus
    • †Peneteius aquilonius – type locality for species
  • †Penetetrapites
    • †Penetetrapites inconspicuous
  • †Pentacrinus
    • †Pentacrinus asteriscus
  • †Permophorus
    • †Permophorus triassicus
  • †Phelopteria
  • Pholadomya
  • Shells in differing orientations of Physa freshwater bladder snails
    Physa
    • †Physa copei – or unidentified comparable form
  • †Piceoerpeton
    • †Piceoerpeton naylori – type locality for species
  • †Piksi – type locality for genus
  • †Pinna
    • †Pinna kingi
  • †Pistia
    • †Pistia corrugata
  • †Pityocladus
  • †Pityophyllum
    • †Pityophyllum lindstromi
  • †Pityosporites
    • †Pityosporites constrictus
  • †Placunopsis
  • †Plastomenus
    • †Plastomenus costatus
  • †Platacodon
    • †Platacodon nanus
  • †Platanophyllum
  • †Plesiacanthoceras
    • †Plesiacanthoceras wyomingense
  • †Plesiacanthoceratoides
    • †Plesiacanthoceratoides alzadense
  • †Plesiobaena
    • †Plesiobaena antiqua
  • †Pleuromya
    • †Pleuromya oblongata – or unidentified comparable form
    • †Pleuromya subcompressa
  • †Pleuronautilus
  • †Pleuronectites – tentative report
  • †Plicatolamna
    • †Plicatolamna arcuata
  • †Podozamites
    • †Podozamites lanceolatus
  • †Polycingulatisporites
    • †Polycingulatisporites reduncus
  • Mounted fossilized skeleton of the Late Cretaceous primitive horned dinosaur Prenoceratops
    †Prenoceratops – type locality for genus
  • †Prismatoolithus
    • †Prismatoolithus hirschi – type locality for species
    • †Prismatoolithus levis
  • †Pristinuspollenites
    • †Pristinuspollenites microsaccus
  • †Proamphiuma
    • †Proamphiuma cretacea
  • †Procerberus
  • †Prodesmodon
    • †Prodesmodon copei
  • †Promyalina
    • †Promyalina spathi – type locality for species
  • Mounted fossilized skeleton of the Late Cretaceous duck-billed dinosaur Prosaurolophus
    †Prosaurolophus
  • †Protalphadon
    • †Protalphadon foxi – type locality for species
    • †Protalphadon lulli
  • †Protexanites
  • †Protocaiman
  • †Protocardia
    • †Protocardia schucherti
  • †Protolambda
    • †Protolambda mcgilli – type locality for species
  • †Protolamna
    • †Protolamna sokolovi
  • †Protophyllocladus
    • †Protophyllocladus subintegrifolius
  • †Protophyllum – or unidentified comparable form
  • †Protoplatyrhina – type locality for genus
    • †Protoplatyrhina renae – type locality for species
  • †Protoscaphirhynchus – type locality for genus
    • †Protoscaphirhynchus squamosus – type locality for species
  • Fossilized mandible of the Late Cretaceous-Paleocene mammal Protungulatum
    †Protungulatum
    • †Protungulatum coombsi – type locality for species
    • †Protungulatum gorgun
  • †Psammorhynchus
    • †Psammorhynchus longipinnis – type locality for species
  • †Pseudocycas
    • †Pseudocycas douglasii – type locality for species
  • †Pseudohypolophus
  • †Pseudomelania
    • †Pseudomelania hendricksoni
  • †Pteria – tentative report
    • †Pteria ussurica – or unidentified comparable form
  • †Pteropelyx – type locality for genus
  • †Ptychotrygon
  • Assemblage of fossilized shells of the Cretaceous-Pleistocene oyster Pycnodonte
    Pycnodonte

Q

  • †Quenstedtia – tentative report
  • Quercus – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Quercus stantoni
  • Life restoration of a flock of the Late Cretaceous pterosaur Quetzalcoatlus feeding on the ground
    †Quetzalcoatlus – or unidentified comparable form

R

  • †Retinovena – type locality for genus
    • †Retinovena fluvialis – type locality for species
  • †Retitricolpites
    • †Retitricolpites microreticulatus
  • Rhabdocolpus
  • †Rhaeboceras
    • †Rhaeboceras burkholderi – type locality for species
    • †Rhaeboceras cedarense – type locality for species
    • †Rhaeboceras coloradoense
    • †Rhaeboceras halli
    • †Rhaeboceras subglobosum
  • †Rhamnus – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Rhamnus cleburni
  • †Richardoestesia
  • †Rostellites – tentative report
  • Life restoration of the Late Cretaceous horned dinosaur Rubeosaurus
    †Rubeosaurus
  • †Rugocaudia – type locality for genus

S

T

U

V

  • †Valenopsalis
    • †Valenopsalis joyneri
  • Valvata – tentative report
    • †Valvata montanensis
  • †Varalphadon
    • †Varalphadon wahweapensis
  • †Veniella
  • Vitis – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Vitis stantoni
  • Viviparus
    • †Viviparus couesii
  • Life restorations of the Late Cretaceous marine bivalve Volviceramus
    †Volviceramus
    • †Volviceramus exogyroides
    • †Volviceramus involutus

W

  • †Weediaphyllum – type locality for genus
    • †Weediaphyllum parkensis – type locality for species
  • †Weltrichia
  • †Wodehousia
    • †Wodehousia spinata
  • †Woodwardia – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Woodwardia crenata

X

Y

Z

References

  1. 1 2 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. 2019 (427): 1–72. doi:10.1206/0003-0090.427.1.1. hdl:2246/6926. S2CID 91263199.
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