Preliminary location and age database for invertebrate fossils collected in the San Francisco Bay region, California
Open-File Report
2003-465
By: John M. Parker, William B. West, William T. Malmborg, and Earl E. Brabb
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Abstract
Most geologic maps published for central California in the past century have been made without the benefit of microfossils. The age of Cretaceous and Tertiary rocks in the structurally complex sedimentary formations of the Coast Ranges is critical in determining stratigraphic succession and in determining whether the juxtapositon of similar appearing formations means that a fault is present. Since the 1930’s, at least, oil company geologists have used microfossils to assist them in geologic mapping and in determining the environments of deposition of sedimentary rocks. This information has been confidential, but in the past 20 years the attitude of petroleum companies about this information has changed, and much material is now available. We report here on approximately 4,700 samples, largely foraminifers, from surface localities in the San Francisco Bay region of California. The information contained here can be used to update geologic maps, to analyze the depth and temperature of ocean water covering parts of California during the Mesozoic and Cenozoic eras, and for solving other geologic problems.
Suggested Citation
Parker, J.M., West, W., Malmborg, W.T., and Brabb, E.E., 2003, Preliminary location and age database for invertebrate fossils collected in the San Francisco Bay region, California: U.S. Geological Survey Open-File Report 2003-465, Report: 5 p.; 3 Master Fossil files: FP7, TAB, CSV, https://doi.org/10.3133/ofr03465.
ISSN: 2331-1258 (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Preliminary location and age database for invertebrate fossils collected in the San Francisco Bay region, California |
| Series title | Open-File Report |
| Series number | 2003-465 |
| DOI | 10.3133/ofr03465 |
| Year Published | 2003 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Geology, Minerals, Energy, and Geophysics Science Center |
| Description | Report: 5 p.; 3 Master Fossil files: FP7, TAB, CSV |
| Country | United States |
| State | California |
| Other Geospatial | San Francisco Bay |