The Paleontology of North America

The Cretaceous in Washington, US

 map

undifferentiated rock units

See exposures in this state from the:

Quaternary
Tertiary
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
Precambrian

Cretaceous Fossils

No slide show is available for the Cretaceous in Washington.

Paleontology and geology

Mid-Cretaceous marine ammonite and clam fossils are found east of Mt. Baker in the Cascade Range. These animals must have lived on the western edge of the North American continent before the final pieces of crust were attached as exotic terranes. Fossils of Late Cretaceous ammonites, clams, snails, and marine reptiles occur in the westernmost San Juan Islands and the adjacent Gulf and Vancouver Islands of British Columbia.

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