Figure 2. Cretaceous and Tertiary sedimentary basins that contain petroleum source rocks, the Coast Ranges where these rocks crop out, and the location of Kesterson National Wildlife Refuge, onshore oil and gas fields, and wells mentioned in this web site.

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http://geology.wr.usgs.gov/wreg/env/location.html
Contact: Margaret A. Keller (mkeller@usgs.gov)
Western Region Energy Group–Environmental Studies
Modified: July 31, 2002

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