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Open-File Report 2014-1198

Late Holocene Sedimentary Environments of South San Francisco Bay, California, Illustrated in Gravity Cores

By Donald L. Woodrow, Theresa A. Fregoso, Florence L. Wong, and Bruce E. Jaffe

Thumbnail of and link to report PDF (8.4 MB)Abstract

Data are reported here from 51 gravity cores collected from the southern part of San Francisco Bay by the U.S. Geological Survey in 1990. The sedimentary record in the cores demonstrates a stable geographic distribution of facies and spans a few thousand years. Carbon-14 dating of the sediments suggests that sedimentation rates average about 1 mm/yr. The geometry of the bay floor and the character of the sediment deposited have remained about the same in the time spanned by the cores. However, the sedimentary record over periods of centuries or decades is likely to be much more variable. Sediments containing a few bivalve shells and bivalve or oyster coquinas are most often found west of the main channel and near the San Mateo Bridge. Elsewhere in the south bay, shells are rare except in the southernmost reaches where scattered gastropod shells are found.

First posted October 10, 2014

For additional information, contact:
Pacific Coastal and Marine Science Center
U.S. Geological Survey
Pacific Science Center
400 Natural Bridges Drive
Santa Cruz, CA 95060
http://walrus.wr.usgs.gov/

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Suggested citation:

Woodrow, D.L., Fregoso, T.A., Wong, F.L., Jaffe, B.E., 2014, Late Holocene sedimentary environments of south San Francisco Bay, California, illustrated in gravity cores: U.S. Geological Survey Open-File Report 2014–1198, 91 p. https://dx.doi.org/10.3133/ofr20141198.

ISSN: 2331-1258 (online)



Contents

Abstract

Introduction

Main Features of the Sediments

Age of Sediments

Discussion and Summary

Acknowledgments

References Cited

Appendixes 1-4


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