DescriptionSandstones (Casper Formation, Middle Pennsylvanian to Lower Permian; near Ayres Natural Bridge, Wyoming, USA) 12 (49145110141).jpg
Sandstones in the Upper Paleozoic of Wyoming, USA.
These cliffs form the walls of a narrow gorge cut by LaPrele Creek in eastern Wyoming. Just upstream from here is Ayres Natural Bridge, a rare erosional feature that spans the stream.
The rocks themselves are Upper Paleozoic sandstones of the Casper Formation The colors are from iron oxide (hematite, Fe2O3).
Stratigraphy: Casper Formation (also known as the Tensleep Formation), Middle Pennsylvanian to Lower Permian
Locality: Ayres Natural Bridge over LaPrele Creek, southern end Natural Bridge Road, south of Interstate 25, west of the town of Douglas, Converse County, eastern Wyoming, USA
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