Geology of the onshore part of San Mateo County, California: A digital database

This digital map database, compiled from previously published and
unpublished data, and new mapping by the authors, represents the
general distribution of bedrock and surficial deposits in San Mateo
County. Together with the accompanying text, it provides current
information on the geologic stucture and stratigraphy of the area
covered. The database delineates map units that are identified by
general age and lithology following the stratigraphic nomenclature
of the U.S. Geological Survey. The scale of the source maps limits
the spatial resolution (scale) of the database to 1:62,500 or smaller.