CALIFORNIA GEOLOGICAL SURVEY
Welcome to the California Geological Survey Web Site. We're here to help you find information on the geology, natural resources and geologic hazards of California.
In 1880 the California Legislature established the State Mining Bureau which has evolved during its 127 years of continuous service into the modern California Geological Survey (CGS). Of course the earliest history of CGS has its founding roots entwined with the discovery of gold in 1848.
The CGS staff is dedicated to the fulfillment of our stated mission of providing information and advice to protect life and property from natural hazards and to promote a better understanding of California's diverse geologic environment.
CGS geoscientists, engineers, and support staff take great pride in being part of an organization that has a 127 year legacy of providing scientific and engineering service to the State of California.
Thank you, California!
RECENT RELEASES
- December 23, 2008 - Map Sheet 48 (Revised)
Earthquake Shaking Potential Map of California. Click here to view the Release Statement.Click here to view the Map.
- November 25, 2008 - Map Sheet 55A
Age and Character of Silicic Ash-Flow Tuffs at Haskell Peak, Sierra County, California: Part of a Major Eocene(?)-Oligocene Paleovalley Spanning the Sierra Nevada-Basin and Range Boundary. Click here to view the Release Statement
- November 13, 2008 - Special Report 208
Radon Potential in San Luis Obispo County, California.
Click here to view the Release Statement.Click here to view the Special Report.
- September 26, 2008 - New CD Release
GIS Data for the Geologic Map of the Lake Tahoe Basin, California and Nevada. Click here to view the Release Statement.
- September 22, 2008 - Special Publication 117A (revised).
Guidelines for Evaluating and Mitigating Seismic Hazards in California
Click here to view the Release Statement. Click here to view the Special Publication.
- August 27, 2008 - New Map Release
CGS has released two new Official Seismic Hazard Zone Maps for the Dublin and Livermore Quadrangles, in Alameda County. Click here to view the maps.
CGS has also released a new preliminary Seismic Hazard Zone Map for the Altamont Quadrangle, in Alameda County. Click here to view the map.
- July 30, 2008 - New Regional Geologic Map
CGS has released a Geologic Map of the San Diego 30' x 60' Quadrangle. Click here for the Release Statement and Sample Map.
