U.S. Geological
Survey
Open-File Report 01-031
Online version 1.0
By
Digital preparation by
Pamela M. Cossette
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INTRODUCTION The Southern California Areal Mapping Project (SCAMP) has undertaken regional geologic mapping investigations in Joshua Tree National Park, sponsored by Geologic Division's National Cooperative Geologic Mapping Program in cooperation with the National Park Service. These investigations span the east end of Pinto Basin and include parts of the Eagle, Cottonwood, Hexie, and Pinto Mountains. Quadrangles being mapped include the Conejo Well, Porcupine Wash, San Bernardino, and Pinto Mountain 7.5' quadrangles, Riverside County, California. Mapping of the Conejo Well quadrangle has been directed toward generating a multipurpose digital geologic map database. The quadrangle, situated in the eastern Transverse Ranges physiographic and structural province, encompasses part of the northern Eagle Mountains and part of the south flank of Pinto Basin. It is underlain by a basement terrane comprising Proterozoic metamorphic rocks, Mesozoic plutonic rocks, and Mesozoic and Mesozoic or Cenozoic hypabyssal dikes. The basement terrane is capped by a widespread Tertiary erosion surface preserved in remnants in the Eagle Mountains and buried beneath Cenozoic deposits in Pinto Basin. Locally, Miocene basalt overlies the erosion surface. A sequence of at least three Quaternary pediments is planed into the north piedmont of the Eagle Mountains, each in turn overlain by successively younger residual and alluvial deposits. The Tertiary erosion surface is deformed and broken by north-northwest-trending, high-angle, dip-slip faults in the Eagle Mountains and an east-west trending system of high-angle dip- and left-slip faults. In and adjacent to the Conejo Well quadrangle, faults of the both sets displace Miocene sedimentary rocks and basalt deposited on the Tertiary erosion surface and Pliocene and (or) Pleistocene deposits that accumulated on the oldest pediment. Faults of the NNW-trending system appear to be overlain by Pleistocene deposits that accumulated on younger pediments. |
Learn more about the Conego Well dataset and its contents
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This illustration is a .jpg (JPEG) non-navigable image of the USGS geologic-map plot of the Conejo Well quadrangle. A full-size, navigable map graphic can be viewed on-screen (cwell_map.pdf ) or can be plotted either from the PostScript file (cwell_map.ps.gz) or the PDF file. Note: the full-size plot requires a large-format plotter, and is best reproduced at 600 (or greater) dpi. |
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EXPLANATORY
FILES
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File
Name
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File
Type and Description
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File Size | |
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Readme tabulates contents of database and describes how to access them. Provided in ASCII text and Portable Document formats. Metadata file contains detailed technical descriptions of structure and content of digital data. Provided as parseable text in ASCII format, and as outline in Hypertext Markup Language format. Also available on the USGS Geologic Division Node of the National Geospatial Data Clearinghouse in these two and other formats. Explanatory pamphlet describes approach used in building database, and discusses purpose, content, and geologic framework of database. |
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| cwell_readme.txt |
ASCII
readme file
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25
KB
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| cwell_readme.pdf |
PDF
readme file
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111
KB
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| cwell_met.txt |
ASCII
metadata file
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74
KB
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| cwell_met.html |
HTML
metadata file
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95
KB
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| cwell_pamph.txt |
ASCII version of explanatory pamphlet
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51
KB
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| cwell_pamph.pdf |
PDF
version of explanatory pamphlet
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138
KB
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DATA
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| Database files are packaged as a tarred and gzipped file that bundles and compresses the following information: Database files: ASCII-formatted ARC/INFO interchange/export (.e00) file for each ARC/INFO coverage, symbolset, and dictionary. ASCII text files for readme, metadata, and explanatory pamphlet. | |||
| cwell.tar.gz | GZIP compressed 25.2-MB TAR bundle of all database files |
5.4
MB
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FILES
FOR VIEWING AND PLOTTING
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| Gzip-compressed PostScript plot-file for generating paper copy of geologic map with marginal explanation. Portable Document Format file containing full-sized, navigable graphic image of geologic map with marginal explanation. Portable Document Format files containing stand-alone versions of Description of Map and Database Units (DMU) and Correlation of Map and Database Units (CMU) from map-margin explanation | |||
| cwell_map.ps.gz |
Gzipped
244-MB PostScript plot file of map with marginal explanation
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8.9
MB
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| cwell_map.pdf |
PDF
file containing geologic map with marginal explanation
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5.0
MB
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| cwell_cmu.pdf | PDF Correlation of Map and Database Units file |
77
KB
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| cwell_dmu.pdf | PDF Description of Map and Database Units file |
70
KB
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Visit the GeoScience Node of the National Spatial Data Clearinghouse to find other geologic-map datasets in southern California or elsewhere in the Nation Download a free copy of Adobe Reader For questions about the content of this report, contact Robert Powell |
This report
is only available on the web.
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URL
of this page: https://pubs.usgs.gov/of/2001/of01-031
Maintained by: Michael Diggles
Created: March 8, 2001
Last modified: November 17, 2005 (mfd)