by Thomas W. Dibblee, Jr. ; edited by John A. Minch. Relief shown by contours and spot heights; depths shown by contours. "The field work for this map was completed while Tom Dibblee was with the U.S. Geological Survey. Where appropriate this map has recently been updated and revised by Tom." "Topographic base map from available USGS 7.5-minute quadrangle NEWARK, CA 1959." "First printing, April 2005." Includes quadrangle location map, index to adjacent 7.5 minute quadrangles, and index to sources of geology. Includes "pertinent references."