by Thomas W. Dibblee, Jr. ; edited by Helmut E. Ehrenspeck. Relief shown by contours and spot heights. Includes acknowledgments, age correlation chart, quadrangle location map, "Index to sources of geology" map, and cross-section diagram. "Prepared in cooperation with the California Department of Conservation, Division of Mines and Geology; and U.S. Geological Survey." Includes "Pertinent references."