Abstract

A maximum composite thickness of 18,200 feet of Paleozoic strata ranging in age from early Lale Cambrian to late Early Pennsylvanian and about 3500 feet of Neogene and Pleistocene rocks are exposed in the Pahranagat Range. Nineteen Paleozoic formations and 35 members belonging to 13 formations are recognized along with five Cenozoic formations on a Composite Column which presents the thickness ranges, detailed lithologic description, and tentatively identified fauna for all units.

Paleozoic formations have been correlated where possible with lithologies and faunas described elsewhere in eastern Nevada and Utah, resulting in the employment of only one new formation term. The sequence is typical of a miogeosynclinal facies being composed primarily of dolomite, limestone, and orthoquartzite with only 10 per cent shale.

Four Neogene formations are distinguished by a sequence of welded tuffs, other pyroclastic rocks, water-worked tuffs, lacustrine beds, and basalt flows (Dolgoff and Reso, 1962). The “Older Alluvium” refers to well-indurated Pleistocene sands and gravels.

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