Skip to main content
U.S. flag

An official website of the United States government

Geologic map of the San Francisco Bay region

April 19, 2006

The rocks and fossils of the San Francisco Bay region reveal that the geology there is the product of millions of years at the active western margin of North America. The result of this history is a complex mosaic of geologic materials and structures that form the landscape. A geologic map is one of the basic tools to understand the geology, geologic hazards, and geologic history of a region.

With heightened public awareness about earthquake hazards leading up to the 100th anniversary of the 1906 San Francisco earthquake, the U.S. Geological Survey (USGS) is releasing new maps of the San Francisco Bay Area designed to give residents and others a new look at the geologic history and hazards of the region. The “Geologic Map of the San Francisco Bay region” shows the distribution of geologic materials and structures, demonstrates how geologists study the age and origin of the rocks and deposits that we live on, and reveals the complicated geologic history that has led to the landscape that shapes the Bay Area.

Publication Year 2006
Title Geologic map of the San Francisco Bay region
DOI 10.3133/sim2918
Authors R. W. Graymer, B. C. Moring, G.J. Saucedo, C. M. Wentworth, E. E. Brabb, K. L. Knudsen
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Scientific Investigations Map
Series Number 2918
Index ID sim2918
Record Source USGS Publications Warehouse