AAPG 2000 - Bookstore Catalog
Students at a University of California - Berkeley Extension class are examining a sea cave at San Gregorio State Beach south of San Francisco. The sea cave is developed in Miocene-Pliocene marine sedimentary rocks of the Purisima Formation. The ceiling in the sea cave provides excellent exposures of trace fossils, probably formed by worms, clams, and shrimp, which burrowed into the sediment.
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