The Pennsylvanian rocks of central Wyoming are a stratigraphic unit named the Tensleep formation. The formation includes the Tensleep sandstone of Darton and the greater part of the Amsden formation. Marine fossils are fairly abundant and indicate Des Moines age for the entire formation. Most of the Tensleep consists of sandstones which are uniform in size and shape of grain and in composition. The Tensleep was deposited in a shallow part of the Des Moines sea. The Quadrant quartzite is the thin northern extension of the formation. Correlatives in eastern Wyoming are the Hartville and Casper formations and the Minnelusa sandstone, each of which may be in part younger.

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