[Parameters: Topic='SOLID EARTH', Term='ROCKS/MINERALS', Variable_Level_1='MINERALS/CRYSTALS']
Geologic Map Database of the El Mirage Lake Area, San Bernardino and Los Angeles Counties, CaliforniaEntry ID: USGS_OFR_00222
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.]
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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
Data Presentation Form: vector digital dataOnline Resource: http://geopubs.wr.usgs.gov/open-file/of00-222
Start Date: 1999-01-01Stop Date: 1999-12-31
Latitude Resolution: 0.000016 m
Longitude Resolution: 0.000016 m
LAND SURFACE > GEOMORPHOLOGY > FLUVIAL LANDFORMS/PROCESSES
LAND SURFACE > GEOMORPHOLOGY > GLACIAL LANDFORMS/PROCESSES
LAND SURFACE > GEOMORPHOLOGY > TECTONIC LANDFORMS/PROCESSES
LAND SURFACE > TOPOGRAPHY > LANDFORMS
LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > AGE DETERMINATIONS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > BEDROCK LITHOLOGY
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > IGNEOUS ROCKS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > METAMORPHIC ROCKS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > MINERALS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > SEDIMENTARY ROCKS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > SEDIMENTS
SOLID EARTH > TECTONICS > PLATE TECTONICS > FAULT MOVEMENT
Quality Written Quality Assurance reviews were prepared by the Manchester
Laboratory for all laboratory data contained in this report. QA
measures included an assessment of sample holding times, instrument
calibration, method blanks, spike and surrogate recoveries and
precision data. All chemical data are considered acceptable for ... use
with the qualifiers provided.
The laboratory data were reviewed and data qualifiers were added as
appropriate. The data qualifiers used were defined as follows:
B-Analyte also found in laboratory blank;
E-Estimated maximum possible concentration.
N-Spike recovery outside of laboratory control limits.
P-For metals "P" indicates that analyte detected below
quantitation limit. For dioxin and furan congers "P" indicates that
there were poorly resolved gas chromatograph peaks.
U-Not detected. Value is the detection limit.
Data not meeting project guidelines for laboratory precision or
accuracy have been qualified where appropriate.
All data entered in the database were reviewed for data entry errors.
All detected errors were corrected.
Access Constraints None
Use Constraints None
Data Set Progress
Role: TECHNICAL CONTACT
Phone: (360) 407-6766
Email: rjo461 at ECY.WA.GOV
Washington Department of Ecology
Province or State: WA
Postal Code: 98504-7710
Role: DIF AUTHOR
Phone: (301) 614-6898
Email: Tyler.B.Stevens at nasa.gov
NASA Goddard Space Flight Center Global Change Master Directory
Province or State: MD
Postal Code: 20771
Johnson, A. and M. Heffner. 1993. Class II inspection of the Boise
Cascade Pulp & Paper Mill, Wallula, Washington - April 1992.
Washington State Department of Ecology, Environmental Investigations
and Laboratory Services Program, Olympia, WA.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2001-04-27
Last DIF Revision Date: 2012-12-12
Future DIF Review Date: 2002-04-27