CGS Geologic Mapping Program

Basic geologic mapping is the foundation for any comprehensive study undertaken to evaluate earth science related societal and environmental issues. The Geologic Mapping Program was established to prepare and maintain a baseline source of the most current information on the framework geology of California. CGS geologists map and compile geologic maps of the state and its offshore continental margin at various scales.

Thumbnail image of STATEMAP information sheet

The Geologic Mapping Program works in cooperation with the U.S. Geological Survey (USGS) through STATEMAP and SCAMP. Geologic mapping priorities are established under the direction of the State Geologist and the California Geologic Mapping Advisory Committee. Click the image to view the California STATEMAP Project Information Sheet.

Products of the Geologic Mapping Program

Products include statewide 1:750,000-scale geologic and fault activity maps; 1:250,000-scale geologic atlas and regional geologic map series and offshore continental margin maps; 1:100,000 and 1:24,000-scale quadrangle maps of selected areas of the state. Other products include indexes to geologic mapping and graduate theses.

Statewide Geologic Data Maps (1:750,000 scale)

Geologic Atlas of California (1958-1969), and Regional Geologic Map Series (1981-present)

Published and Preliminary maps are available in the following sizes and scales:

  • 1’ x 2’ Quadrangles (1:250,000 scale) Published | Preliminary
    The Geologic Atlas Maps provide complete coverage of the state, while the more recent Regional Geologic Map series provides coverage of selected areas of northern and southern California.
  • 30’ x 60’ Quadrangles (1:100,000 scale) Published | Preliminary
    Coverage of selected areas of northern and southern California. Regional Geologic Map Series only.
  • 15-Minute Quadrangles (1:62,500 scale)
    Coverage of selected areas of northern California only. NOTE: These maps are not available for download; please contact CGS Publications for ordering information.
  • 7.5-Minute Quadrangles (1:24,000 scale) Preliminary only
    Coverage of selected areas of northern and southern California. Regional Geologic Map Series only.

Continental Margin Maps (1:250,000 scale)

Nearly complete coverage of off-shore areas. Continental Margin Maps are currently not available for download; please contact CGS Publications for ordering information.

Compilation of California Regional Geologic Mapping References

This link does not provide a pathway to viewable maps; to view maps, click one of the links above or visit our Maps and Data page.