Geologic Map and Digital Database of the Bachelor Mountain 7.5' Quadrangle, Riverside County, California

The Geologic Map and Digital Database of the Bachelor Mountain 7.5' Quadrangle,
Riverside County, California contains a digital geologic map database of the
Bachelor Mountain 7.5 - quadrangle, Riverside County, California that includes:

1. ARC/INFO (Environmental Systems Research Institute, http://www.esri.com)
version 7.2.1 coverages of the various elements of the geologic map.

2. A Postscript file to plot the geologic map on a topographic base, and
containing a Correlation of Map Units diagram (CMU), a Description of Map Units
(DMU), and an index map.

3. Portable Document Format (.pdf) files of:
a. This Readme; includes in Appendix I, data contained in bch_met.txt
b. The same graphic as plotted in 2 above. Test plots have not produced precise
1:24,000-
scale map sheets. Adobe Acrobat page size setting influences map scale.

The Correlation of Map Units and Description of Map Units is in the editorial
format of USGS Geologic Investigations Series (I-series) maps but has not been
edited to comply with I-map standards. Within the geologic map data package,
map units are identified by standard geologic map criteria such as
formationname, age, and lithology. Where known, grain size is indicated on the
map by a subscripted letter or letters following the unit symbols as follows:
lg, large boulders; b, boulder; g, gravel; a, arenaceous; s, silt; c, clay;
e.g. Qyfa is a predominantly young alluvial fan deposit that is arenaceous.
Multiple letters are used for more specific identification or for mixed units,
e.g., Qfysa is a silty sand. In some cases, mixed units are indicated by a
compound symbol; e.g., Qyf2sc.

[Summary provided by the USGS.]