This study of Lower Permian rocks in northeastern Nevada and northwestern Utah was undertaken to provide a basis for interpretation of Early Permian history of the Cordilleran Miogeosyncline. The area of study extends from the western margin of the miogeosyncline, along the eastern edge of the old Antler highlands, eastward into the Salt Lake Desert west of Salt Lake City (Fig. 1), where outcrops of Permian rocks are few. It extends along the miogeosyncline in Nevada from northern Lincoln County into northern Elko County. The base of the Permian was selected as the lower stratigraphic limit for this study. The base of the Kaibab Limestone was selected as the upper limit, although the Lower-Upper.*** Permian boundary occurs above it (Baird and Collinson, 1975), because it forms a reliable horizon for correlation and marks the commencement of a new depositional cycle in this region.
Work concerning Lower Permian rocks of the central Cordilleran Miogeosyncline includes that of Steele (1959, 1960) and Bissell (1960, 1962a, 1962b, 1964, 1967, 1970, 1974), which are regional in scope, and that of Stevens (1965), Collinson (1968), Zabriskie (1970), and, Marcantel (1975), which presents more details in smaller areas. Many different facies, the distribution of which generally has been credited to various highs depocenters, troughs, basins, highlands, or shelves, often on the basis of tenuous data have been recognized.