ABSTRACT

Detailed mapping in the Salina 7½-minute quadrangle has provided new data on the stratigraphic and structural history of the area. Exposed strata range from Middle Jurassic to Holocene, including one of the most complete early Tertiary sections in Utah. The rocks have undergone several episodes of faulting and folding, resulting in complex and often puzzling geologic relationships. At least seven factors have been important in development of the present structural configuration of the area: (1) relationship to the Utah hinge line, (2) position in relation to the Colorado Plateau, (3) effects of Sevier orogenic deformation, (4) effects of Basin and Range faulting, (5) effect and timing of the Wasatch monocline, (6) possible effects of older faults, and (7) results of evaporite flowage of the Arapien Shale. Extent of Sevier faulting and evaporite movement are the most controversial of these. Previous interpretations in the area range from control primarily by Sevier deformation to control primarily by evaporite flowage. Recently acquired data support an interpretation based on the combined effects of evaporite flowage and faulting to produce the features now present in the quadrangle.

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