The Purisima Formation and related rocks (upper Miocene - Pliocene), greater San Francisco Bay area, central California [electronic resource] : review of literature and USGS collection now housed at the Museum of Paleontology, University of California, Berkeley / by Charles L. Powell, II.
Imprint
[Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : USGS Information Service [distributor], 1998.
