Ironstone is an iron oxide-dominated rock. Some of the examples seen here are lustrous and highly polished from wind abrasion. Wind-polished rocks are called ventifacts.
Stratigraphy: Ericson Sandstone, Mesaverde Group, upper Upper Cretaceous
Locality: desert floor south of old pumice prospect in western Zirkel Mesa, northwest of the town of Superior, Sweetwater County, southwestern Wyoming, USA (vicinity of 41° 47' 32.69" North latitude, 108° 56' 22.27" West longitude)
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