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The Tensleep Sandstone is a geological formation of Pennsylvanian to very early Permian age in Wyoming. [2]The formation is composed of fine- to medium-grained sandstone, light gray and yellowish gray; generally slightly to moderately calcareous; some dolomite and sandy dolomite beds; mostly thick to massive sets of low-angle, wedge-planar crossbeds of dunes.
Ten Sleep is a town in Washakie County, Wyoming, United States. It is located in the Bighorn Basin in the western foothills of the Bighorn Mountains , approximately 26 miles (42 km) east of Worland and 59 miles (95 km) west of Buffalo .
The Pennsylvanian system is represented by the Amsden Formation and the Tensleep Sandstone. Cliffs of the Tensleep Sandstone can be seen along the Gros Ventre River at the east edge of the park. The Amsden, below the Tensleep, consists of red and green shale, sandstone, and thin limestone.
Another advancement in Wyoming paleontology occurred in 1932 when Edward Branson and Maurice Mehl reported the discovery of a fossil trackway in Wyoming's Tensleep Sandstone. [33] These tracks were given the ichnospecies Steganoposaurus belli. [33] The tracks were probably made by a web-footed animal slightly less than three feet long. [33]
The basin contains over 60 oil and gas fields mostly as structural traps within seventeen different formations. The primary reservoirs include the Pennsylvanian Tensleep Sandstone, the Permian Phosphoria Formation and the Cretaceous Muddy Creek and Frontier sandstones. [3]
The Phosphoria is underlain by the Pennsylvanian-Permian Casper Formation [1] or, depending on the location, by the Park City Formation or the Tensleep Sandstone, [5] and it is overlain by the Triassic Dinwoody Formation. [1]
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The Precambrian crystalline basement rocks of Wyoming include schist and gneiss in the Wyoming Craton, which formed during the Archean beginning 3. 6 billion years ago. The Wyoming Craton was sutured together with the Superior Craton and Hearne Craton during the Trans-Hudson Orogeny.