National Geologic Map Database
General Information
- Title: Quaternary geology of Contra Costa County, and surrounding parts of Alameda, Marin, Sonoma, Solano, Sacramento, and San Joaquin Counties, California: a digital database
- Author(s): Helley, E.J., and Graymer, R.W.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Open-File Report OF-97-98
- Publication Date: 1997
- Map Scale: 1:100,000
- Cross Section: None
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Additional Resources
- Links and Downloads:
- Publication (includes original ARC/INFO 7.x GIS data)
- Shapefile version (converted by NGMDB, Sept., 2023 )
- For more information, please contact:
- U.S. Geological Survey
- USGS Information Services
- Box 25286
- Denver, CO 80225
- Phone: (303) 202-4700 or 1-888-ASK-USGS
- Fax: (303) 202-4710
* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.