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

Preliminary Regional Geologic Maps
By: , and 



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.

Study Area

Publication type Report
Publication Subtype State or Local Government Series
Title Geologic and geophysical maps of the Stockton 30’ × 60’ quadrangle, California
Series title Preliminary Regional Geologic Maps
Year Published 2023
Language English
Publisher California Geological Survey
Contributing office(s) Geology, Minerals, Energy, and Geophysics Science Center
Description Report: iv, 73 p.; 1 Plate: 60.00 x 35.00 inches
Country United States
State California
Other Geospatial Stockton quadrangle
Google Analytic Metrics Metrics page
Additional publication details