Prepared for the joint annual field trip of the Pacific Section, American Association of Petroleum Geologists and Pacific Section, Society of Economic Paleontologists and Mineralogists, October 20-21, 1967
editors, Karen Grove and Stephen Graham ; [prepared for presentation at the 1986 Fall fieldtrip of the Pacific Section of the Society of Economic Paleontologists and Mineralogists held at Nacimiento Lake, California] October 4-5, 1986