Skip to main content
U.S. flag

An official website of the United States government

Geologic and geophysical maps of the Stockton 30’ × 60’ quadrangle, California

August 1, 2023

This pamphlet and accompanying geologic and geophysical maps are the products of cooperative efforts by the California Geological Survey (CGS) and United States Geological Survey (USGS) to compile a comprehensive, digital representation of the bedrock geology, Quaternary surficial deposits, and potential-field anomalies within the boundaries of the Stockton 30’ × 60’ quadrangle. The Stockton 30’ × 60’ quadrangle covers approximately 4,890 km2 of Contra Costa, Alameda, San Joaquin, and Stanislaus Counties, California. From the rugged hillsides of the northern Diablo Range in the west to the San Joaquin Valley in the east, the map extends roughly 88 km across growing suburban communities of the eastern San Francisco Bay Area and Livermore Valley, grass-covered ranchlands along eastern slopes of the Diablo Range, and into the low farmlands of the San Joaquin Valley and Sacramento-San Joaquin River Delta (Figure 1). The elevation ranges from near sea level in the Delta to 1,173 meters on Mt. Diablo, the most prominent peak of the San Francisco Bay region.

Publication Year 2023
Title Geologic and geophysical maps of the Stockton 30’ × 60’ quadrangle, California
Authors M. P. Delattre, Russell W. Graymer, Victoria Langenheim, Keith L. Knudsen, T. E. Dawson, Earl E. Brabb, Carl M. Wentworth, Loren A. Raymond
Publication Type Report
Publication Subtype State or Local Government Series
Series Title Preliminary Regional Geologic Maps
Index ID 70248708
Record Source USGS Publications Warehouse
USGS Organization Geology, Minerals, Energy, and Geophysics Science Center