Preliminary Geologic Map of the Lake Mead 30' X 60' Quadrangle, Clark County, Nevada, and Mohave County, Arizona
Open-File Report
2007-1010
Prepared in cooperation with the National Park Service
By: L. S. Beard, R.E. Anderson, D.L. Block, R. G. Bohannon, R.J. Brady, S.B. Castor, E. M. Duebendorfer, J. E. Faulds, T.J. Felger, K. A. Howard, M. A. Kuntz, and V. S. Williams
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Abstract
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 The geology was compiled from many sources, both published and unpublished, including significant new mapping that was conducted specifically for this compilation. Geochronologic data from published sources, as well as preliminary unpublished 40Ar/39Ar ages that were obtained for this report, have been used to refine the ages of formal Tertiary stratigraphic units and define new informal Tertiary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.
Suggested Citation
Beard, L.S., Anderson, R., Block, D., Bohannon, R.G., Brady, R., Castor, S., Duebendorfer, E.M., Faulds, J.E., Felger, T., Howard, K.A., Kuntz, M.A., Williams, V.S., 2007, Preliminary Geologic Map of the Lake Mead 30' X 60' Quadrangle, Clark County, Nevada, and Mohave County, Arizona (Version 1.0): U.S. Geological Survey Open-File Report 2007-1010, 3 Plates (Plate 1: 37 x 27 in, Plate 2: 37 x 30 in, Plate 3: 34 x 30 in); Pamphlet: iv, 105 p.; Metadata; Read Me; Data Files, https://doi.org/10.3133/ofr20071010.
ISSN: 2331-1258 (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Preliminary Geologic Map of the Lake Mead 30' X 60' Quadrangle, Clark County, Nevada, and Mohave County, Arizona |
| Series title | Open-File Report |
| Series number | 2007-1010 |
| DOI | 10.3133/ofr20071010 |
| Edition | Version 1.0 |
| Year Published | 2007 |
| Language | ENGLISH |
| Contributing office(s) | Western Earth Surface Processes |
| Description | 3 Plates (Plate 1: 37 x 27 in, Plate 2: 37 x 30 in, Plate 3: 34 x 30 in); Pamphlet: iv, 105 p.; Metadata; Read Me; Data Files |
| Projection | Transverse Mercator |
| Scale | 100000 |
| Online Only (Y/N) | Y |
| Additional Online Files (Y/N) | Y |