U.S. Geological Survey
Open-File Report 03-501
Version 1.0

Surficial and Bedrock Geologic Map Database of the Kelso 7.5 Minute Quadrangle, San Bernardino County, California

By David R. Bedford

Introduction This geologic map database describes geologic materials for the Kelso 7.5 Minute Quadrangle, San Bernardino County, California. The area lies in eastern Mojave Desert of California, within the Mojave National Preserve (a unit of the National Parks system). Geologic deposits in the area consist of Proterozoic metamorphic rocks, Cambrian-Neoproterozoic sedimentary rocks, Mesozoic plutonic and hypabyssal rocks, Tertiary basin fill, and Quaternary surficial deposits. Bedrock deposits are described by composition, texture, and stratigraphic relationships. Quaternary surficial deposits are classified into soil-geomorphic surfaces based on soil characteristics, inset relationships, and geomorphic expression. The surficial geology presented in this report is especially useful to understand, and extrapolate, physical properties that influence surface conditions, and surface- and soil-water dynamics. Physical characteristics such as pavement development, soil horizonation, and hydraulic characteristics have shown to be some of the primary drivers of ecologic dynamics, including recovery of those ecosystems to anthropogenic disturbance, in the eastern Mojave Desert and other arid and semi-arid environments.

This report consists of three primary components: documentation, a digital geologic map database, and a printable map plot file. This text serves to provide a discussion and interpretation of the geology, as well as introduce and describe the digital data. There is no paper map included in the report. The report includes PostScript and PDF plot files that can be used to plot images of the geologic map.

1. Documentation
• Report Text: 34 page PDF file: of03-501_1a.pdf (2 MB)
• Report Text: 34 page ASCII file: of03-501_1a.txt (140 KB)
Note: this file excludes figures and formatting
• FGDC Metadata: ASCII file: of03-501_1b.txt (51 KB)
• FGDC Metadata: HTML file: of03-501_1b.html (70 KB)
• FGDC Metadata: ASCII file: of03-501_1bfaq.html (38 KB)
• Revisions made to this report: ASCII file: of03-501revs.txt (2 KB)


2. Digital Geologic Map Database (GIS files)
• Faults, depositional contacts, and rock units: of03-501_2a.e00 (2 MB)
• Structural measurements: of03-501_2b.e00 (78 KB)
• Tar file containing the above plus FGDC Metadata and an import AML: of03-501_2.tar (2.1 MB)


3. Printable plot files of the geologic map
• Print optimized PDF plot file (45 x 30 inches): of03-501_3a.pdf (6.3 MB)
• Postscript plot file (45 x 30 inches): of03-501_3a.eps (53 MB)

For questions about the content of this report, contact David Bedford

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This report is also available via print on demand from:
U.S. Geological Survey, Map Distribution, Box 25286, Federal Center, Denver, CO 80225

or by calling the Earth Science Information Center in Denver
at (303)202-4200