The Permian in Wyoming, US

Paleontology and geology

Although no rocks of Permian age are shown on this map, exposures of these rocks do occur in a number of outcrops in the Bighorns, Black Hills, and several other mountain ranges throughout the state. These rocks are mainly limestones and shales, with some sandstones — evaporites are also common, recording the retreat of the sea from Wyoming. Fossils include brachiopods, as well as occasional sponges, horn corals, bryozoans, pelecypods, gastropods, belemnites, ostracods, conodonts, and fish.