Abstract
The Humboldt formation of northeastern Nevada consists of 5,800 feet of continental deposits which range in grain size from coarse fanglomerate to fine shale and in composition from lake deposits of limestone and oil shale to stream-laid conglomerate, sandstone, and mudstone interbedded with fine pyroclastics of water-laid and air-borne types. These beds may be divided into three members: (1) a lower member, mostly lake beds; (2) a middle member characterized by ash and tuff beds; (3) an upper member, mostly stream-laid deposits. Vertebrate and plant remains indicate a late Miocene age and an environment more humid than the present. The formation occupies basins separated by northward-trending fault-block mountains. It was originally deposited in a large irregular depression or a series of connected intermontane basins, which have become basins of sedimentation through warping or faulting. In the area considered, some of the basin and mountain blocks have been outlined by faulting during deposition of the...
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