General distribution of geologic materials in the San Francisco Bay region, California: A digital map database
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Geology topics
Publications and source records attributed to C. M. Wentworth.
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This report describes the various bedrock and soil materials and slope gradients that constitute hillsides in the San Francisco Bay region. Distribution of materials and slopes is shown on 1:125,000-scale maps of the region. Approximately 360 materials units are described by bedrock composition, physical properties of bedrock (rock hardness, spacing of fractures and partings, and bed thickness), texture of the soil cover, expansivity, permeability, and stratigraphic thickness. Materials map units are based on compilations of geologic mapping of the region; descriptions are based on systematic field observations, free-swell tests for expansivity, examination of aerial photographs, and the literature.
This structure contour map shows the general structural configuration of the Cenozoic section in the area surrounding Kettleman Hills and Lost Hills. It was compiled from electric well-log data available through April 1982 (Ammann Map Services, 1978; Petroleum Information Corporation, 1982; California Division of Oil and Gas, 1982) and from surface geology (Dibblee, 1971; 1973).
This structure contour map, originally compiled during a study of the 1983 Coalinga earthquakes, shows the general structural configuration of the upper several kilometers of section in the Coalinga area. It was compiled by using electric well-log data available through April 1982 (Ammann Map Services, 1978; Petroleum Information Corporation, 1982; California Division of Oil and Gas, 1982) and surface geology (Dibblee, 1971; Mansfield, 1971).
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