Introduction

Open-File Report 03-293 is a digital geologic data set that maps and describes the geology of the San Bernardino 30' x 60' quadrangle, San Bernardino, Los Angeles, and Riverside Counties, southern California. The San Bernardino quadrangle database is one of several 30' x 60' quadrangle databases that are being produced by the Southern California Areal Mapping Project (SCAMP). These maps and databases are, in turn, part of the nation-wide digital geologic map coverage being developed by the National Cooperative Geologic Map Program of the U.S. Geological Survey (USGS). The San Bernardino data set consists of a digital geologic map database accompanied by graphics, map plot, and explanatory files. The digital database was created using ARC/INFO, version 8.1, commercial Geographical Information System (GIS) software designed by Environmental Systems Research Institute (ESRI), Redlands, California (http://www.esri.com). The database includes ARC/INFO geospatial coverages and supporting SCAMP symbolsets. PostScript and 508-compliant Portable Document Format files include (1) a geologic map generated from the database, (2) a fault map, (3) a Correlation of Map Units (CMU), (4) a list of map units, (5) a sheet containing three figures, and (6) a pamphlet containing a regional geologic synthesis and a detailed Description of Map Units..