California Paleontology

The Precambrian and Paleozoic: Sedimentary rocks from the Precambrian and Early Paleozoic are most often found in the White Mountains, Inyo Mountains, and near Death Valley in Southern California. The Precambrian rocks rarely contain fossils, but deposits from the Cambrian through Devonian contain numerous fossils, such as corals, ammonites, and brachiopods, indicating a shallow, warm water environment teeming with life. The fossil record of the later Paleozoic (Carboniferous and Permian), best represented in Northern California (Shasta and Butte Counties), indicates both shallow and deep water deposits, as well as swamps and estuarine environments. Some of the late Paleozoic rocks are most likely exotic terranes that were carried in from the west as a result of tectonic activity.

Here's the linkie:
Map of California Precambrian Deposits