The Oquirrh basin contains Pennsylvanian and lower Permian sedimentary rocks as much as 26,000 feet thick, which consist of a lower part of clastic limestone, sandy limestone, and minor shale; a middle part of cyclically bedded limestone and sandstone, and an upper part of sandstone chert and shale. The Permian Phosphoria basin contains as much as 3,500 feet of shale, cherty shale, chert, dolomite and limestone. These basins are downwarped segments of the Cordilleran geosyncline superposed on a complex structural pattern of Precambrian and early and middle Paleozoic age. In Cretaceous time, Paleozoic and lower Mesozoic rocks were thrust eastward along the Willard-Charleston-Nebo thrust belt in the Wasatch Mountains.

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