Introduction Evaluation Prospects










Antler Thrust Domain

The Antler Thrust Domain is defined by the presence of simple and imbricate thrusts of Devonian-Mississippian age related to emplacement of the Roberts Mountains allochthon over Cambrian through Mississippian sediments. This domain is broadly exposed along the western margin of the evaluation area within the southern Independence and Tuscarora Mountains, Sheep Creek Range, Dry Hills, Shoshone Range, Cortez, Simpson Park, and Roberts Mountains, Sulphur Spring, northern Toiyabe, Antelope, and Fish Creek Ranges, and the Mahogany Hills.

The geometry of various Antler or Roberts Mountains thrusts within this domain are discussed both in the Structural Setting and Range Structure portions of this volume. Both thrust exposure and intensity vary to some degree across the domain. Thrusting is somewhat poorly exposed in the northern portion of the domain where it is overprinted by the Northern Nevada Rift Domain and its associated Miocene volcanic flows. Thrusting is also obscured in the southern portion of the domain by thick Oligocene and Miocene ignimbrites that are locally eroded through to expose the underlying structural level. Abundant imbricate thrusts are present in the Shoshone and northern Toquima Ranges and in the southern Independence and Tuscarora Mountains, while relatively simple thrust surfaces are present in the Cortez and Simpson Park Mountains, and in the Sulphur Spring and Monitor Ranges.

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Last modified: 09/12/06