List of the Mesozoic life of California

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

Diagram depicting the soft part anatomy of the sea snail Abyssochrysos

Fossilized teeth of the Permian-Paleocene cartilaginous fish Acrodus

Life restoration of the Late Cretaceous armored dinosaur Aletopelta

Fossilized shell of the Jurassic-Miocene sea snail Ampullina

Interior and exterior of a shell of an Anomia , or jingle shell

Multiple views of a shell of an Aporrhais pelican foot sea snail

A living Architectonica staircase shell sea snail

Fossilized shell of the Early Jurassic ammonoid cephalopod Arnioceras

Fossilized partial skull of the Late Cretaceous duck-billed dinosaur Augustynolophus

Fossilized shell of the Late Cretaceous ammonoid cephalopod Baculites

Mounted fossilized skeleton of the Cretaceous turtle Basilemys

Fossilized shell of the Late Cretaceous ammonoid cephalopod Bostrychoceras

A living Bulimulus land snail

Restoration of the Late Triassic ichthyosaur Californosaurus

Fossilized shell of the Late Cretaceous ammonoid cephalopod Calycoceras

Shells of modern Capulus cap sea snails

Two views of a Cerithium cerith sea snail

Shell and spines of a Cidaris sea urchin

Fossilized shell of the Late Cretaceous ammonoid Collignoniceras

Fossilized shell of the Early Cretaceous ammonoid cephalopod Crioceratites

Fossilized shell of the Late Jurassic-Oligocene nautiloid cephalopod Cymatoceras

Life restoration of the Middle-Late Triassic ichthyosaur Cymbospondylus

Fossilized shell of the Middle-Late Triassic marine bivalve Daonella

Fossilized shells of the Early Cretaceous ammonoid cephalopod Desmoceras

Restoration of several species of the Late Cretaceous ammonoid cephalopod Didymoceras

Fossilized shell of the Late Cretaceous ammonoid cephalopod Discoscaphites

Fossilized shell of the Early-Late Cretaceous ammonoid cephalopod Douvilleiceras

Restoration of the Early Cretaceous-Eocene bony fish Enchodus , or the "saber-toothed herring"

Illustration of the fossilized skull of the sea turtle Euclastes

Fossilized shell of the Late Cretaceous ammonoid cephalopod Exiteloceras

Fossilized shell of the Late Cretaceous ammonoid cephalopod Fagesia

Fossilized shell of the Cretaceous ammonoid cephalopod Gaudryceras

Fossilized shell of a Glycymeris , or bittersweet clam

Fossil negative with skin impressions of the theropod dinosaur footprint ichnogenus Grallator

A living Haliotis , or abalone

Fossilized shell of the Triassic ammonoid cephalopod Hedenstroemia

Modern individual of the Cretaceous-modern cow shark genus Heptranchias

Shell of a Hipponix , or hoof sea snail

Restoration of two of the Permian-Late Cretaceous cartilaginous fish Hybodus

Restoration of the Late Cretaceous toothed bird Ichthyornis

Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size

Fossilized shell of the Permian-modern marine bivalve Isognomon

Fossilized shells of the Jurassic brachiopod Kallirhynchia

Fossilized shell of the Early Cretaceous ammonoid cephalopod Kossmaticeras

Fossilized shell of the Triassic-modern marine bivalve Lopha

Fossilized shell of the Early Jurassic-Late Cretaceous ammonoid cephalopod Lytoceras

Fossilized shell of the Middle Jurassic ammonoid cephalopod Macrocephalites

Fossilized shell of the Early-Late Cretaceous ammonoid cephalopod Mariella

Assemblage of fossilized shells of the Late Cretaceous ammonoid cephalopod Menuites

Fossilized shell of the Early Cretaceous ammonoid cephalopod Mortoniceras

Fossilized shell of the Jurassic-Cretaceous marine bivalve Myophorella

Shells washed ashore of Mytilus mussels

Life restoration of the Late Triassic thalattosaurs Nectosaurus (right) and Thalattosaurus

Fossilized shell of the Jurassic-Cretaceous sea snail Nerinea

Restoration of several species of the Late Cretaceous ammonoid cephalopod Nostoceras

Interior of a fossilized shell of the Early Ordovician-modern marine bivalve Nucula

Fossilized shell of the Late Cretaceous ammonoid cephalopod Pachydiscus

Fossilized shell of the Late Cretaceous ammonoid cephalopod Parapuzosia with a human indicating its size

Shells of Pecten scallops

Fossilized shell of the Late Cretaceous ammonoid cephalopod Peroniceras

Life restoration of the Early Jurassic-Late Cretaceous ammonoid cephalopod Phylloceras

Mounted fossilized skeleton of the Late Cretaceous mosasaur Plotosaurus

Fossilized shell of the Late Cretaceous ammonoid cephalopod Polyptychoceras

Life restoration of the Late Cretaceous mosasaur Prognathodon

Fossilized shell of the Triassic ammonoid cephalopod Protrachyceras

Fossilized shell of a Pseudomelania sea snail

Fossilized shell of the Jurassic-Cretaceous marine bivalve Pterotrigonia

Assemblage of fossilized shells of the Cretaceous-Pleistocene oyster Pycnodonte

Fossilized shell of the Silurian-Eocene articulate brachiopod Rhynchonella

Restoration of several of the Early Cretaceous-Miocene shark Scapanorhynchus

Life restoration of three species of the Middle-Late Triassic ichthyosaur genus Shastasaurus

Life restoration of the Late Cretaceous shark Squalicorax

Shell of a Tellina , or tellin

A living Terebralia horn sea snail

Reconstructive illustration of the skull in side (above) and top view of the Late Triassic thalattosaur Thalattosaurus . The frontmost portion of the snout is portrayed erroneously as straight; it actually had a pronounced downward curve

Fossilized shell of the Permian-Paleocene marine bivalve Trigonia

Fossilized shell in multiple views of the Early-Late Cretaceous sea snail Trochactaeon

Fossilized shells of the Late Jurassic-modern tower snail Turritella