Special Report 217: Geologic Compilation of Quaternary Surficial Deposits in Southern California (2012 Revision)

Aerial photo of suburban development at the toe of an alluvial fan.

​​by
Trinda L. Bedrossian, CEG, Peter Roffers, Cheryl A. Hayhurst, PG, Jeremy T. Lancaster, CEG and William R. Short, CEG
Digital Preparations by Solomon McCrea, Barbara Wanish, Jim Thompson, Anita Carney, Michelle A. Meyers and Shannon Utley
December 2012

Decorative imageThe Dep​artment of Conservation, California Geological Survey (DOC/CGS), with funding from the Department of Water Resources (DWR), completed this update of a Geographic Information System (GIS)-based compilation of high-resolution geologic maps of Quaternary age and older deposits in southern California from Santa Barbara to San Diego. This revision of Special Report 217 merges existing geologic mapping by various authors, and at different scales, into a common seamless format that normalizes and differentiates alluvial fan deposits, related Quaternary deposits, and various older deposits into 40 derivative units at a scale of 100,000 for the entire area. Special Report 217 is available as a free download from this web page.

SR 217 Document Downloads

SR 217 GIS Data Downloads

SR 217 Quadrangle Downloads (Plates 3 through 25)

Select your area of interest from the list of quadrangles below.

 

Amboy 30’ x 60’ Quadrangle

Blythe 30’ x 60’ Quadrangle (West Half)

Cuddeback Lake 30’ x 60’ Quadrangle

Cuyama 30’ x 60’ Quadrangle (Eastern Three-Quarters)

El Cajon 30’ x 60’ Quadrangle

Ivanpah 30’ x 60’ Quadrangle

Lancaster 30’ x 60’ Quadrangle

Long Beach 30’ x 60’ Quadrangle (Onshore Portion)

Los Angeles 30’ x 60’ Quadrangle

Mesquite Lake 30’ x 60’ Quadrangle (California Portion)

Newberry Springs 30’ x 60’ Quadrangle

Oceanside 30’ x 60’ Quadrangle (Onshore Portion)

Orange County 100k Map

Palm Springs 30’ x 60’ Quadrangle

San Bernardino 30’ x 60’ Quadrangle

San Diego 30’ x 60’ Quadrangle (Onshore Portion)

San Gabriel River Hydrologic Unit 100k Map

Santa Ana 30’ x 60’ Quadrangle

Santa Barbara 30’ x 60’ Quadrangle (Onshore Portion)

Sheep Hole Mountains 30’ x 60’ Quadrangle

Soda Mountains 30’ x 60’ Quadrangle

Taft 30’ x 60’ Quadrangle

Tehachapi 30’ x 60’ Quadrangle