Preliminary photointerpretation map of landslide and other surficial deposits of the Mount Vaca, Vacaville, and parts of Courtland, Davis, Lake Berryessa, and Woodland 15-minute quadrangles, Napa and Solano counties, California

This map presents preliminary information about the distribution and general character of landslides and other surficial deposits.  When used in combination with other types of information, such as data on soils, bedrock geology, slopes, seismic response, hydrology, vegetation and climatic variation, it should be easier to arrive at sound decisions regarding the physical aspects of land use.  The U.S. Geological Survey is studying many of these factors as part of its San Francisco Bay Regional Environment and Resources Planning Study in cooperation with the Department of Housing and Urban Development.