geology by T.W. Dibblee Jr. Relief shown by contours and spot heights. "Topographic base map from available USGS 7.5-minute quadrangle Carneros Rocks, CA 1959, photorevised 1982, DMA 2054 IV NE -- Series V895; Belridge, CA 1953, photorevised 1973, AMS 2054 I NW --Series V895." "First printing, October 2006." Includes quadrangle location map, index to adjacent 7.5 minute quadrangles, and index to sources of geology.