Geologic Map Database of the El Mirage Lake Area, San Bernardino and Los Angeles Counties, California
Dataset Identification:
Resource Abstract:
<div> This geologic map database for the El Mirage Lake area describesgeologic materials for the dry lake, parts of the adjacent
ShadowMountains and Adobe Mountain, and much of the piedmont extendingsouth from the lake upward toward the San Gabriel Mountains.This
area lies within the western Mojave Desert of San Bernardinoand Los Angeles Counties, southern California. The area istraversed
by a few paved highways that service the community ofEl Mirage, and by numerous dirt roads that lead to outlyingproperties.
An off-highway vehicle area established by theBureau of Land Management encompasses the dry lake and much ofthe land north
and east of the lake. The physiography of thearea consists of the dry lake, flanking mud and sand flats andalluvial 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 surficialdeposits of the El Mirage Lake area. It was prepared as part ofa water-resource assessments of
the area, describing andinterpreting surface geology that provides information to helpunderstand distribution and extent of
deeper groundwater-bearingunits. The area mapped covers the Shadow Mountains SE and partsof the Shadow Mountains, Adobe Mountain,
and El Mirage 7.5-minutequadrangles. The map database includes detailed geology ofsurface and bedrock deposits, which represent
a significantupdate from previous bedrock geologic maps by Dibblee (1960) andTroxel and Gunderson (1970), and the surficial
geologic map ofPonti and Burke (1980); it incorporates a fringe of the detailedbedrock mapping in the Shadow Mountains by
Martin (1992). </div>
Citation
Title Geologic Map Database of the El Mirage Lake Area, San Bernardino and Los Angeles Counties, California
other Citation Details
Cinergi keyword enhanced at Mon Jan 16 15:08:36 UTC 2017
purpose:
This digital geologic map database, intended for use at 1:24,000-scale, describes and portrays the rock units and surficialdeposits
of the El Mirage Lake area. It was prepared as part ofa water-resource assessments of the area, describing andinterpreting
surface geology that provides information to helpunderstand distribution and extent of deeper groundwater-bearingunits. Map
data were assembled as a digital database using ARC/INFO to enable wider applications than traditional paper-productgeologic
maps and to provide for efficient integration with otherdigital data bases prepared by the U.S. Geological Survey'sSouthern
California Areal Mapping Project(http://geology.wr.usgs.gov/wgmt/scamp), other federal and stateagencies, and the Mojave Water
Agency.