Additional Details

Description

Introduction

This digital map database, which is compiled from previously published and unpublished sources combined with new mapping, represents the general distribution and identity of bedrock in Contra Costa County, California. Together with the accompanying text file (ccgeo.txt), it provides current information on the stratigraphy and structural geology of the area covered. The database delineates map units that are identified by general age and lithology, and stratigraphic nomenclature. Quaternary units, however, are almost all combined into an undifferentiated unit, with the exception of Pleistocene gravels (Qmz) and several landslides on Mount Diablo (Qls). More specific information about the units may be available in the original publications. The scale of the source maps limits the spatial resolution (scale) of the database to 1:50,000 or smaller. For those interested in the geology of Contra Costa County who do not use an ARC/INFO compatible Geographic Information System (GIS), we have included two Postscript plot files containing images of much of the data included in the digital database. The content and character of the database, as well as two methods of obtaining the database are described briefly below. A more detailed description of the database is included with it.

Height In Inches

34.000

Length In Inches

44.000

Pieces

3