Preliminary Geologic Map of the Elsinore 7.5 - Quadrangle, Riverside County, California

Geologic Map of the Elsinore 7.5? Quadrangle, Riverside County, California
ontains a digital geologic map database of the Elsinore 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 els_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
formation-name, 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. Even though this is an Open-File Report and
includes the standard USGS Open-File disclaimer, the report closely adheres to
the stratigraphic nomenclature of the U.S. Geological Survey. Descriptions of
units can be obtained by viewing or plotting the .pdf file (3b above) or
plotting the postscript file (2 above).

[Summary provided by the USGS.]