List of the Mesozoic life of Montana

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.

Life restoration of the Late Cretaceous dromaeosaurid ("raptor") Acheroraptor
Life restoration of the Late Cretaceous horned dinosaur Albertaceratops
Life restoration of the Late Jurassic theropod dinosaur Allosaurus
Image of restored specimen of a squat quadruped with knobby back
Life restoration of the Late Cretaceous armored dinosaur Ankylosaurus
Life restoration of the Early Cretaceous primitive horned dinosaur Aquilops
Fossilized shells of the Middle Jurassic ammonoid cephalopod Arcticoceras
Shell of a modern Astarte bivalve
Life restoration of the Late Cretaceous toothed bird Avisaurus with prey
Fossilized shell of the Late Cretaceous ammonoid cephalopod Baculites
Diagram of the known fossil material of the Late Cretaceous dromaeosaurid ("raptor") Bambiraptor
Fossilized skeleton of the Late Cretaceous bony fish Belonostomus
Fossilized natural mummy of the Late Cretaceous duck-billed dinosaur Brachylophosaurus
Life restoration of a herd of the Late Jurassic sauropod dinosaur Camarasaurus
Life restoration of the Late Cretaceous horned dinosaur Centrosaurus
Life restoration of the Late Cretaceous horned dinosaur Chasmosaurus
Life restoration of the face of the Late Cretaceous multituberculate mammal Cimolomys
Life restoration of the Late Cretaceous mosasaurid Clidastes
Mounted fossilized skeleton of the Late Cretaceous duck-billed dinosaur Corythosaurus
Life restoration of the Early Cretaceous dromaeosaur ("raptor") Deinonychus
Mounted fossilized skeleton of the Late Cretaceous marsupial relative Didelphodon
Life restoration of the Late Jurassic long-necked dinosaur Diplodocus
Illustration of the fossilized pelvis and tail of the Late Cretaceous armored dinosaur Dyoplosaurus
Life restoration of the Late Cretaceous duck-billed dinosaur Edmontosaurus annectens
A living Equisetum , or horsetail
Life restoration of the Late Cretaceous armored dinosaur Euoplocephalus
Fossilized leaf of the Permian-modern tree Ginkgo
Mounted fossilized skeleton of the Middle Jurassic-Late Cretaceous mammal Gobiconodon
Interior and exterior of a fossilized shell of the Late Triassic-Eocene marine bivalve Gryphaea
Life restoration of the Late Cretaceous toothed bird Hesperornis
Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size
Fossilized skeleton of the Middle Jurassic-Miocene Chimaera relative Ischyodus
Life restoration of the Late Cretaceous horned dinosaur Judiceratops
Life restoration of the Late Cretaceous duck-billed dinosaur Kritosaurus
Fossilized skeleton of the Early Jurassic-Late Cretaceous bony fish Lepidotes
Life restoration of the Late Cretaceous primitive horned dinosaur Leptoceratops
Fossilized shell of the Triassic-modern marine bivalve Lopha
Life restoration of the Late Cretaceous horned dinosaur Mercuriceratops
Life restoration of the Early Cretaceous oviraptorosaur Microvenator
Mounted fossilized skeletons of the Late Cretaceous pterosaur Montanazhdarcho
Shells washed ashore of Mytilus mussels
Fossilized skull of the Late Cretaceous tyrannosaur Nanotyrannus , possibly a juvenile Tyrannosaurus rather than a distinct genus
Fossilized skeleton of the Late Cretaceous-Eocene bony fish Notogoneus
Fossilized partial cranium of the Late Cretaceous armored dinosaur Oohkotokia
Life restoration of the Late Cretaceous herbivorous dinosaur Oryctodromeus in a burrow
Life restoration of subadults of the Late Cretaceous dome-headed dinosaur Pachycephalosaurus butting heads
Illustration of a fossilized skull of the Late Cretaceous armored dinosaur Panoplosaurus
Fossilized shell of the Late Cretaceous ammonoid cephalopod Parapuzosia with a human indicating its size
Micrograph of a fossilized tooth of the Late Cretaceous troodontid Pectinodon
Shells in differing orientations of Physa freshwater bladder snails
Mounted fossilized skeleton of the Late Cretaceous primitive horned dinosaur Prenoceratops
Mounted fossilized skeleton of the Late Cretaceous duck-billed dinosaur Prosaurolophus
Fossilized mandible of the Late Cretaceous-Paleocene mammal Protungulatum
Assemblage of fossilized shells of the Cretaceous-Pleistocene oyster Pycnodonte
Life restoration of a flock of the Late Cretaceous pterosaur Quetzalcoatlus feeding on the ground
Life restoration of the Late Cretaceous horned dinosaur Rubeosaurus
Life restoration of the Early Cretaceous armored dinosaurs Sauropelta
Fossilized cranium in multiple views of the Late Cretaceous armored dinosaur Scolosaurus
Life restoration of the Late Cretaceous horned dinosaur Spiclypeus
Restoration of the Late Jurassic stegosaur Stegosaurus
Life restoration of the Early Cretaceous Iguanodon relative Tenontosaurus
Mounted fossilized skeleton of the Late Cretaceous horned dinosaur Triceratops
Illustration of fossilized teeth of the Late Cretaceous Troodon
Fossilized skeleton of the Late Cretaceous tyrannosaur Tyrannosaurus
Life restorations of the Late Cretaceous marine bivalve Volviceramus
A view of the fossil shell of Xenophora infundibulum
Fossil of the Early Triassic-Eocene cycad-like frond Zamites