Geologic Map Database of the El Mirage Lake Area, San Bernardino and Los Angeles Counties, California
Entry ID: USGS_OFR_00222

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Summary
Abstract: This geologic map database for the El Mirage Lake area describes geologic materials for the dry lake, parts of the adjacent Shadow Mountains and Adobe Mountain, and much of the piedmont extending south from the lake upward toward the San Gabriel Mountains. This area lies within the western Mojave Desert of San Bernardino and Los Angeles Counties, southeastern California (see Fig. 1). The area is traversed by a few paved highways that service the community of El Mirage, and by numerous dirt roads that lead to outlying properties. An off-highway vehicle area established by the Bureau of Land Management encompasses the dry lake and much of the land north and east of the lake. The physiography of the area consists of the dry lake, flanking mud and sand flats and alluvial piedmonts, and a few sharp craggy mountains.

This digital geologic map database, intended for use at 1:24,000-scale, describes and portrays the rock units and surficial deposits of the El Mirage Lake area. The map database was prepared to aid in a water-resource assessment of the area by providing surface geologic information with which deepergroundwater-bearing units may be understood. The area mapped covers the Shadow Mountains SE and parts of the Shadow Mountains, Adobe Mountain, and El Mirage 7.5-minute quadrangles (see Fig. 2). The map includes detailed geology of surface and bedrock deposits, which represent a significant update from previous bedrock geologic maps by Dibblee (1960) and Troxel and Gunderson (1970), and the surficial geologic map of Ponti and Burke (1980); it incorporates a fringe of the detailed bedrock mapping in the Shadow Mountains by Martin (1992). The map data were assembled as a digital database using ARC/INFO to enable wider applications than traditional paper-product geologic maps and to provide for efficient meshing with other digital data bases prepared by the U.S. Geological Survey's Southern California Areal Mapping Project.

[Summary provided by the USGS.]

Related URL
Link: GET DATA
Description: Access to data and documentation for OFR 00-222


Link: VIEW EXTENDED METADATA
Description: Complete FGDC metadata for OFR 00-222


Link: VIEW PROJECT HOME PAGE
Description: Southern California Areal Mapping Project (SCAMP) Home Page


Geographic Coverage
 N: 34.73541 S: 34.49907  E: -117.50146  W: -117.690704

Data Set Citation
Dataset Originator/Creator: Miller, David M.; Bedford, David R.
Dataset Title: Geologic Map Database of the El Mirage Lake Area, San Bernardino and Los Angeles Counties, California
Dataset Series Name: U.S. Geological Survey Open-File Report
Dataset Release Date: 2000
Dataset Release Place: Menlo Park, CA
Dataset Publisher: U.S. Geological Survey
Version: 1.0
Data Presentation Form: vector digital data
Online Resource: http://pubs.usgs.gov/of/2000/0222/


Temporal Coverage
Start Date: 1999-01-01
Stop Date: 1999-12-31


Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > CALIFORNIA


Data Resolution
Latitude Resolution: 0.000016 m
Longitude Resolution: 0.000016 m


Science Keywords
LAND SURFACE >GEOMORPHOLOGY >FLUVIAL LANDFORMS/PROCESSES    [Definition]
LAND SURFACE >GEOMORPHOLOGY >GLACIAL LANDFORMS/PROCESSES    [Definition]
LAND SURFACE >GEOMORPHOLOGY >TECTONIC LANDFORMS/PROCESSES    [Definition]
LAND SURFACE >TOPOGRAPHY >LANDFORMS    [Definition]
LAND SURFACE >TOPOGRAPHY >TERRAIN ELEVATION    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >AGE DETERMINATIONS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >BEDROCK LITHOLOGY    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >IGNEOUS ROCKS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >METAMORPHIC ROCKS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >MINERALS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >SEDIMENTARY ROCKS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >SEDIMENTS    [Definition]
SOLID EARTH >TECTONICS >PLATE TECTONICS >FAULT MOVEMENT    [Definition]


ISO Topic Category
ELEVATION
GEOSCIENTIFIC INFORMATION


Platform
MAPS    [Information]


Project
SCAMP >Southern California Areal Mapping Project    [Information]


Access Constraints
None


Use Constraints
Acknowledgement of the U.S. Geological Survey, Southern California Areal
Mapping Project, Mojave Water Agency, and California Division of Mines and
Geology would be appreciated in products derived from this dataset


Keywords
Mojave
Geology
geologic map
geologic database
ARC/INFO
GIS
Mojave Desert
San Bernardino County
Los Angeles County
Southern California
El Mirage
Nash Hill
Shadow Mountains
Adobe Mountain


Data Set Progress
COMPLETE


Originating Center
USGS


Data Center
Publications-Western Region,Geological Division, U.S. Geological Survey, U.S. Department of the Interior    [Information]
Data Center URL: http://geopubs.wr.usgs.gov/
Dataset ID: El Mirage Lake California Database

Data Center Personnel
Name: CAROLYN A. DONLIN
Phone: 650-329-5015
Fax: 650-329-5119
Email: cdonlin at usgs.gov
Contact Address:
U.S. Geological Survey
Geology Division
345 Middlefield Road
City: Menlo Park
Province or State: California
Postal Code: 94025
Country: USA



Distribution
Distribution_Media: online
Distribution_Format: ARC/INFO
Fees: None


Personnel
DAVID M. MILLER
Role: TECHNICAL CONTACT
Phone: (650) 329-4923
Fax: (650) 329-4936
Email: dmiller at usgs.gov
Contact Address:
U.S. Geological Survey
Geology Division
345 Middlefield Rd
MS 975
City: Menlo Park
Province or State: CA
Postal Code: 94025
Country: USA


DAVID R. BEDFORD
Role: DIF AUTHOR
Phone: 650-329-4924
Fax: 650-329-4936
Email: dbedford at usgs.gov
Contact Address:
U.S. Geological Survey
Geology Division
345 Middlefield Rd
MS 975
City: Menlo Park
Province or State: CA
Postal Code: 94025
Country: USA


Publications/References
Dibble, T.W. (1960), Preliminary geologic map of the Shadow Mountains quadrangle, Los Angeles and San Bernardino Counties, California, U.S. Geological Survey Miscellaneous Field Studies Map MF-227

Troxel, B.W. Gunderson, J.N. (1970), Geology of the Shadow Mountains and northern part of the Shadow Mountains SE quadrangles, western San Bernardino County, California, California Division of Mines and Geology Preliminary Report 12

Ponti, D.J. Burke, D.B (1980), Map showing Quaternary geology of the eastern Antelope Valley and vicinity, California: U.S., Geological Survey Open-File Report OFR80-1064

Martin, M.W. (1992), Stratigraphic and structural evolution of the Shadow Mountains, western Mojave Desert, California: Implications for the tectonic development of the central and western Mojave Desert, 196, University of Kansas, Unpublished Ph.D. dissertation

Creation and Review Dates
DIF Creation Date: 2000-03-23
Last DIF Revision Date: 2014-04-09

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