Purisima Formation

The Purisima Formation is a geologic formation in California that preserves fossils dating from the Late Miocene to Late Pliocene.

[1] It stretches from Point Reyes to the Santa Cruz Mountains.

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Trace fossils in Purisima Formation sandstone at San Gregorio State Beach in California. The trace fossils appear as a lighter colored sandstone than the surrounding material. The trace fossils, likely left by clams or worms, come in both circular and elongated oval shapes.
Trace fossils in Purisima Formation sandstone at San Gregorio State Beach in California