Pa<"e FIGURE 1. Index map showing the principal mountain ranges in the Great Basin region in northwestern Utah ___ /2 2. Sketch map of the Oquirrh Mountains and South Mountain showing the locations of the Rogers Canyon, Bingham, and Curry Peak sequences _____.__________________________________ 3 3. Generalized columnar sections of the Rogers Canyon and Bingham sequences in the Oquirrh Mountains_ 4 4. Sketch map of the Oquirrh Mountains showing location of type and reference sections _______ _ _ 5 5. Columnar sections showing the development of upper Paleozoic rock-stratigraphic divisions in the Bingham sequence ________________________.___________________________________ 6 6. Columnar sections showing the development of upper Paleozoic rock stratigraphic divisions in the Rogers Canyon sequence __________________._____________________________________ 8 7-12. Photographs of: 7. Typical exposures of Rogers Canyon sequence _____________________ _ 12 8. General features of the lithology of the lowermost part of the Lake Point Limestone _ __ __ ]"3 9. The upper two-thirds of Erda Formation and the basal part of Kessler Canyon Formation _ 15 10. Typical exposures of reference section of the West Canyon Limestone and the basal portion of the Butterfield Peaks Formation in Soldier Canyon __________________-__________ 24 11. Typical exposures of the middle part of the Butterfield Peaks Formation at the head of White Pine Canyon tributary of Middle Canyon __.________________________________ _ 27 12. Typical exposures of the Jordan (limestone) marker bed (a thick cherty limestone) within the base of the Clipper Ridge Member of the Bingham Mine Formation at the type locality of the member in Middle Canyon ______-______________________________ _ 28 13.

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Location and setting. The Ophir and Mercur 7 1/2-minute quadrangles, Utah, comprise the southern end of the Oquirrh Mountains, about 59 km southwest of Salt Lake City, Utah.The quadrangles include parts of Tooele and Utah Counties, and the well-known Ophir and Mercur (Camp Floyd) mining districts.The Oquirrh Mountains, which extend from the south end of the Great Salt Lake to Fivemile Pass, a distance of 55 km, is the easternmost of the block-faulted mountain ranges that comprise the Cordilleran Great Basin in Utah.Summary sequence of geologic events 1. Deposition of miogeoclinal sediments an unknown distance to the west along the western edge of the North American craton during Paleozoic and Early Mesozoic time.

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