Geologic Map and Digital Database of the Apache Canyon 7.5' Quadrangle, Ventura and Kern Counties, California, USGS OFR 00-359

Created using Environmental Systems Research Institute's ARC/INFO software, the data base consists of the following items: (1) a map coverage showing geologic contacts, faults and units, (2) a separate coverage layer showing structural data, (3) an additional point coverage which contains bedding data, (4) a point coverage containing sample localities, (5) a scanned topographic base at a scale of 1:24,000, and (6) attribute tables for geologic units (polygons), contacts (arcs), and site-specific data (points).

The data base is accompanied by a readme file and this metadata file. In addition, the data set includes the following graphic and text products: (1) A jpg file (.jpg) containing a browse-graphic of the geologic map on a 1:24,000 topographic base. The map is accompanied by a marginal explanation consisting of a List of Map Units, a Correlation of Map Units, and a key to point and line symbols.

(2) A .pdf file of a geologic explanation pamphlet that includes a Description of Map Units. (3) Two postScript graphic plot-files: one containing the geologic map on a 1:24,000 topographic base and the other, three accompanying structural cross sections. The geologic map database contains original U.S. Geological Survey data generated by detailed field observation and by interpretation of aerial photographs.

The map was created by transferring lines and point data from the aerial photographs to a 1:24,000 topographic base by using a PG-2 plotter. The map was scribed, scanned, and imported into ARC/INFO, where the database was built. Within the database, geologic contacts are represented as lines (arcs), geologic units as polygons, and site-specific data as points.

Polygon, arc, and point attribute tables (.pat, .aat, and .pat, respectively) uniquely identify each geologic datum and link it to other tables (.rel) that provide more detailed geologic information.