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Open-File Report 01-449

Prepared in cooperation with California Division of Mines and Geology and U.S. Air Force

Geologic Map of the Steele Peak 7.5’Quadrangle, Riverside County, California

By Douglas M. Morton

Digital preparation by Rachel M. Alvarez and Van M. Diep

Thumbnail of and link to report PDF (1.6 MB)Introduction

Open-File Report 01-449 contains a digital geologic map database of the Steele Peak 7.5’ quadrangle, Riverside County, California that includes:

  1. ARC/INFO (Environmental Systems Research Institute, 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 stp_met.txt

b. The same graphic as plotted in 2 above. Test plots have not produced 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. Marine deposits are in part overlain by local, mostly alluvial fan, deposits and are labeled Qomf. Grain size follows f.

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).

First posted January 15, 2002

  • Symbols TAR.GZ (44 kB)
    Symbol set (including points, lines, and color sets) used for this map. This file will allow users to generate plots that use the same symbols as in the plot available here

Learn more about the Steele Peak data set and its contents

For additional information, contact:
Geology, Minerals, Energy, and Geophysics Science Center
U.S. Geological Survey
345 Middlefield Road, MS 901
Menlo Park, CA 94025-3591

Part or all of this report is presented in Portable Document Format (PDF). For best results viewing and printing PDF documents, it is recommended that you download the documents to your computer and open them with Adobe Reader. PDF documents opened from your browser may not display or print as intended. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Morton, Douglas M., Alvarez, Rachel M., Diep, Van M., 2001, Geologic Map of the Steele Peak 7.5’Quadrangle, Riverside County, California: U.S. Geological Survey Open-File Report 01-449,


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