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The carnotite deposits of the Colorado Plateau appear to have been localized by geologic structures resulting from sedimentary conditions rather than from regional deformation* Ihey are thought to have accumulated from ground-water solutions shortly after the ore-bearing beds were deposited. Even though many problems regarding the origin of the carnotite deposits cannot be satisfactorily explained, some of the geologic features with which ore is commonly associated are useful guides in ore-finding. The relations of these features to ore are summarized as a preliminary statement of the results of studies being made by the li, S. Geological Survey* Most of the carnotite deposits are in the korrison formation of Jurassic age. The ore generally impregnates sandstone, but some of the fossil plant material in the ore-bearing beds is richly mineralized* Many of the deposits are in or near the thicker, central parts of sandstone lenses. Beds of sandstone less than about 20 feet thick rarely contain sizeable ore deposits. In places the ore-bearing sandstone lenses are well defined, but most are broad and poorly defined* Where observations can be made, trends of the lenses can be recognized by a study of bedding and the orientation of fossil logs, but because the lenses are discontinuous, their trends cannot be projected very far* The sandstone

Geologic guides to carnotite deposits on the Colorado Plateau