List of the Mesozoic life of Oregon

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

†Modiolus

Fossilized shells of the Early-Late Cretaceous marine bivalve Actinoceramus
Life restoration of two species of the Late Triassic ammonoid cephalopod Arcestes
Shell of a modern Astarte bivalve
Fossilized shell of the Late Cretaceous ammonoid cephalopod Calycoceras
Life restoration of the Late Triassic-Middle Jurassic nautiloid cephalopod Cenoceras
Fossilized shell of the Early Cretaceous ammonoid cephalopod Crioceratites
Fossilized shell of the Carboniferous-Eocene bivalve Gervillia
Interior and exterior of a fossilized shell of the Late Triassic-Eocene marine bivalve Gryphaea
Fossil of the Jurassic-Paleogene lobster Hoploparia
Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size
Electron micrograph of fossilized teeth from the Early Jurassic-Early Cretaceous freshwater shark Lissodus
Fossilized shell of the Early Cretaceous ammonoid cephalopod Lyelliceras
Fossilized shell of the Late Cretaceous ammonoid cephalopod Mantelliceras
Fossilized shell of the Devonian-modern marine bivalve Modiolus , or horsemussel
Fossilized shell of the Jurassic-Cretaceous sea snail Nerinea
Fossilized shell of the Early Cretaceous ammonoid cephalopod Olcostephanus
Shell of an Ostrea , or oyster
Fossilized shell of the Late Cretaceous ammonoid cephalopod Pachydiscus
Fossil of the Devonian-Cretaceous sponge Peronidella
Life restoration of three species of the Middle-Late Triassic ichthyosaur genus Shastasaurus
Fossil of the Triassic-Eocene stony coral Thamnasteria
Fossilized shell of the Permian-Paleocene marine bivalve Trigonia
Fossilized shells of the Late Jurassic-modern tower snail Turritella