U.S. Geological Survey Open-File Report 2011–1262
Introduction and BackgroundChevron Petroleum Company in 2001 donated an estimated 50,000 foraminifer slides, 5,000 well logs, geologic and surface locality maps, and paleontologic reports to the California Academy of Sciences and Stanford University for safekeeping, because they stopped or cut back exploration for petroleum deposits in California. The material was loaned to Earl Brabb temporarily so that information useful to the U.S. Geological Survey could be extracted. Among the estimated 5,000 well logs, more than 2,500 were printed on fragile Ozalid paper that had deteriorated by turning brown and hardening so that they could be easily damaged. These 2,516 well logs were scanned to provide a digital copy of the information (data set 1, posted separately at https://pubs.usgs.gov/of/2011/1262/of2011-1262_data_set1_filecabinets The 2,516 wells extend over an area from Eureka in Humboldt County south to the Imperial Valley and from the Pacific Ocean east to the eastern side of the Great Valley and the Los Angeles Basin. The wells are located in 410 7.5-minute quadrangle maps in 42 counties. The digital information herein preserves the data, makes the logs easily distributed to others interested in subsurface geology, and makes previously proprietary information widely available to the public for the first time. |
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Brabb, E.E., 2011, Location and age of foraminifer samples examined by Chevron Petroleum Company paleontologists from more than 2,500 oil test wells in California: U.S. Geological Survey Open-File Report, 2011-1262, 4 p. and data files, available at https://pubs.usgs.gov/of/2011/1262/.
Introduction and Background
Information Provided
Ages of Foraminifers
Acknowledgments
References Cited
Readme file
Data Sets