AN  INTEGRATED PETROLEUM  EVALUATION OF NORTHEASTERN  NEVADA


Introduction Evaluation Prospects


 

 

Up
Havallah
Reservation Hill
Pumpernickel
Mitchell Creek
Schoonover
Lee Canyon Argillite
Webb
Antelope Range
 

 

 

 

 

 

 

UPPER PALEOZOIC
WESTERN SILICEOUS AND VOLCANIC ASSEMBLAGE

The Upper Paleozoic Western Siliceous and Volcanic Assemblage includes cherts, shales, mudstones and siltstone, basalt and andesite, with minor limestones, calcareous quartzites, sandstones and conglomerate in Elko, Lander, Eureka, and northern Nye Counties (Fagan, 1962; Smith and Ketner, 1978; Stewart and McKee, 1977). These units most probably represent accretionary wedges originally deposited within subduction complexes. These units have been displaced eastward by the Antler and Sonoma orogenies and now represent parts of the upper plate of both the Devonian through Mississippian Roberts Mountains allochthon, and the Permian through Triassic Golconda allochthon.

These allochthonous and para-autochthonous Mississippian through Permian lithologies were deposited in a variety of marine environments from relatively shallow to deep marine. Reconstruction of depositional environment and thickness is made difficult by the siliceous and allochthonous nature of the lithologies.


Upper Paleozoic Western Siliceous and Volcanic Assemblage

Permian-Pennsylvanian
    Havallah Formation
    Reservation Hill Formation
    Pumpernickel Formation

Pennsylvanian
    Mitchell Creek Formation
Pennsylvanian-Mississippian
    Schoonover Formation
Mississippian
    Lee Canyon Argillite
    Webb Formation
    Antelope Range Formation


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Last modified: 09/12/06