Graduate Thesis Or Dissertation
 

Mississippian flysch-trough sediments, sources, and structure of the southern Fish Creek Range, Eureka County, Nevada

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  • Sometime in the early Mississippian, huge blocks broke off the toe of the advancing Roberts Mountains thrust and fell into the flysch trough. Within the thesis area, the largest blocks are the Webb/Woodruff blocks, which are composed of Devonian Woodruff Formation thrust over Mississippian Webb Formation. The blocks came to rest on the lower part of the Mississippian Antelope Range Formation (Mar). Deposition of the Mar continued and covered the blocks. When movement on the thrust ceased the allochthon began to rise and volumes of coarse, poorly sorted sediment were deposited in the trough. A coarsening-upward trend is shown in the lithology of the Antelope Range Formation and elsewhere in central Nevada by the Dale Canyon and Diamond Peak Formations. The Mar conglomerate on the east side of the thesis area represents the final stage of molasse sedimentation, locally. Other allochthonous blocks are present in the study area. Represented are the following Devonian units: Devils Gate Limestone, Beacon Peak Dolomite, and the Oxyoke Canyon Sandstone. The provenance of these blocks cannot be exactly determined. They may have been introduced into the flysch trough at the same time as the Webb/Woodruff blocks or they may have arrived during the late Jurassic or early Cretaceous. There is no record of deposition within the thesis area from the late Mississippian to the early Cretaceous. All allochthonous blocks rest on the Mar. Lack of exposure prevented accurate location and analysis of structures, determination of stratigraphic succession, stratigraphic correlation, and interpretion and dating of tectonic events that affected the study area.
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