Geologic Map and Digital Database of the Apache Canyon 7.5' Quadrangle, Ventura and Kern Counties, California

This data set maps and describes the geology of the Apache Canyon
7.5' quadrangle, Ventura and Kern Counties, California. 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.