Preliminary Geologic Map of the Lake Mead 30' X 60' Quadrangle, Clark County, Nevada, and Mohave County, Arizona
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Resource Abstract:
The Lake Mead Quadrangle exposes a tremendous range of strata, from Proterozoic-age crystalline rocks, Paleozoic and Mesozoic
sedimentary rocks, Tertiary sediments, volcanics and plutons, and Late-Tertiary to Quaternary surficial deposits. Introduction
The geologic map of the Lake Mead 30' x 60' quadrangle was completed for the U.S. Geological Survey's Las Vegas Urban Corridor
Project and the National Parks Project, National Cooperative Geologic Mapping Program. Lake Mead, which occupies the northern
part of the Lake Mead National Recreation Area (LAME), mostly lies within the Lake Mead quadrangle and provides recreation
for about nine million visitors annually. The lake was formed by damming of the Colorado River by Hoover Dam in 1939. The
recreation area and surrounding Bureau of Land Management lands face increasing public pressure from rapid urban growth in
the Las Vegas area to the west. This report provides baseline earth science information that can be used in future studies
of hazards, groundwater resources, mineral and aggregate resources, and of soils and vegetation distribution. The preliminary
report presents a geologic map and GIS database of the Lake Mead quadrangle and a description and correlation of map units.
The final report will include cross-sections and interpretive text. The geology was compiled from many sources, both published
and unpublished, including significant new mapping that was conducted specifically for this compilation. Geochronologic data
from published sources, as well as preliminary unpublished 40Ar/39Ar ages that were obtained for this report, have been used
to refine the ages of formal Tertiary stratigraphic units and define new informal Tertiary sedimentary and volcanic units.
Citation
Title Preliminary Geologic Map of the Lake Mead 30' X 60' Quadrangle, Clark County, Nevada, and Mohave County, Arizona
publication Date
2004-01-01T12:00:00
cited responsible party
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individual Name L.S. Beard
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