Title: Preliminary geologic map of the Wabuska quadrangle, Lyon County, Nevada

Author: Nicholas H. Hinz, Alan R. Ramelli, and James E. Faulds
Year: 2013
Series: Open-File Report 2013-08
Version:
Format: 40 x 27 inches, color, includes cross sections
Scale: 1:24,000

A 1:24,000-scale, color preliminary geologic map of the Wabuska 7.5-minute quadrangle in Lyon County, Nevada. The bedrock exposures in this quadrangle consist of Mesozoic and Tertiary volcanic and sedimentary rocks. The Mesozoic section includes locally fossiliferous Late Triassic Limestone that conformably overlies Late to Early Triassic volcanic and volcaniclastic strata.

The Tertiary section includes late Oligocene ash-flow tuffs and a complex middle to late Miocene section of lavas, intrusions, and sedimentary rocks. The Tertiary section is cut by a system primarily down-to-the-east northeast-striking normal faults and is locally folded along north-northeast-trending synextensional synclines and anticlines.

Principal surficial deposits include late Pliocene to modern alluvial fan deposits, Late Quaternary lacustrine deposits of pluvial Lake Lahontan, and Late Quaternary eolian deposits. The Wabuska fault zone cuts across the quadrangle along the southern edge of the Desert Mountains and consists of a system of right-stepping, ENE-striking, strike-slip and oblique-slip faults. Quaternary fault scarps were mapped along segments of the Wabuska fault zone and along several northeast-striking fault zones in the northwest quarter of the quadrangle. This quadrangle also includes the Wabuska power plant–Nevada’s first geothermal power plant, and the natural gas-powered, Fort Churchill General Station.

This map was prepared as part of the STATEMAP component of the National Cooperative Geologic Mapping Program, in cooperation with the U.S. Geological Survey and with support from the Department of Energy.

Original Product Code: OF138