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Open-File Report 2014–1127

Prepared in cooperation with the California Department of Water Resources

Geologic Logs of Geotechnical Cores From the Subsurface Sacramento-San Joaquin Delta, California

By Katherine L. Maier, Daniel J. Ponti, John C. Tinsley, Emma Gatti, and Mark Pagenkopp

Thumbnail of and link to report PDF (1.7 MB)Abstract

This report presents and summarizes descriptive geologic logs of geotechnical cores collected from 2009–12 in the Sacramento–San Joaquin Delta, California, by the California Department of Water Resources. Graphic logs are presented for 1,785.7 ft of retained cores from 56 borehole sites throughout the Sacramento-San Joaquin Delta. Most core sections are from a depth of ~100–200 feet. Cores primarily contain mud, silt, and sand lithologies. Tephra (volcanic ash and pumice), paleosols, and gravels are also documented in some core sections. Geologic observations contained in the core logs in this report provide stratigraphic context for subsequent sampling and data for future chronostratigraphic subsurface correlations.

First posted July 25, 2014

For additional information, contact:
Earthquake Science Center—Menlo Park, Calif. Office
U.S. Geological Survey
345 Middlefield Road, MS 977
Menlo Park, CA 94025

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Suggested citation:

Maier, K.L., Ponti, D.J, Tinsley, J.C., Gatti, E., Pagenkopp, M., 2014, Geologic logs of geotechnical cores from the subsurface Sacramento-San Joaquin Delta, California: U.S. Geological Survey Open-File Report 2014-1127, 10 p.,

ISSN 2331-1258 (online)







References Cited




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