CALIFORNIA GEOLOGICAL SURVEY
Welcome to the California Geological Survey Web Site!
In April 1860 the California Legislature established the Geological Survey of California that has evolved during its 150 years of service, and several name changes, into today’s modern California Geological Survey (CGS). Of course, the earliest history of CGS has its founding roots entwined with the discovery of gold in 1848.
CGS is dedicated to the fulfillment of its mission to provide scientific products and services about the state's geology, seismology and mineral resources that affect the health, safety, and business interests of the people of California.
CGS geoscientists, engineers and support staff take great pride in upholding the heritage of an organization that has a 150 year legacy of providing the highest quality of scientific and engineering products and services to the State of California.
Altiora Petimus (1860)
- April 17, 2013 - California's Non-Fuel Mineral Production for 2011
The report is now available for download. Click here to download.
- April 10, 2013 - New Landslide Inventory Maps
Landslide Inventory Map of the Burbank and Hollywood 7.5-minute Quadrangle is now available.
Click here for the Release Statement.Click here to download the maps.
- March 1, 2013 - Map Sheet 52 (UPDATED 2012)
Aggregate Sustainability in California
Click here for the Release Statement.Click here to download the Report and Map.
- January 22, 2013 - Special Report 217 (REVISED)
Geologic Compilation of Quaternary Surficial Deposits in Southern California.
Click here for the Release Statement.Click here to download the Report.
- October 26, 2012 - New Official Seismic Hazard Zone Map Release
The Lick Observatory 7.5-minute Quadrangle is now available.
Click here to download the Map.
- October 4, 2012 - Map Sheet 60
Geologic Map of the North Lake Tahoe - Donner Pass Region, Northern Sierra Nevada, California.
Click here for the Release Statement.View Map Sheet 60 on an Interactive Google Map.
- September 21, 2012 - Thirteen new and revised Official Alquist-Priolo Earthquake Fault Zone Maps Released.
Areas covered include parts of Alameda, Imperial, Riverside, San Diego, and Ventura counties. This release introduces a new graphic presentation of these regulatory zone maps.
Click here to view or download the new and revised Official Maps.
- July 31, 2012 - Special Report 225
The Oak Creek Post Fire Debris and Hyperconcentrated Flows of July 12, 2008
Inyo County, California: A Geologic Investigation
Click here for the Release Statement.
Click here to view the Report.
- CGS releases State Geologic Map and State Fault Activity Map.
Printed copies are now available for purchase.
Geologic Map Release Statement.
Fault Activity Map Release Statement.
- Click here for more recent releases!