by Thomas W. Dibblee, Jr. ; edited by John A. Minch. Relief shown by contours and spot heights. "The field work for this map was completed as Open File Report OF-80-533C 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 NILES, CA 1961, DMA 1659 III SW-- Series V895, PHOTOREVISED 1980." "First printing, April 2005." Includes quadrangle location map, index to adjacent 7.5 minute quadrangles, and index to sources of geology. Includes "pertinent references."