Casper Formation

{{Short description|Geologic formation in Wyoming, US}}

{{Infobox rockunit

| name = Casper Formation

| image = Sandstones (Casper Formation, Middle Pennsylvanian to Lower Permian; near Ayres Natural Bridge, Wyoming, USA) 12 (49145110141).jpg

| caption = Sandstones (Casper Formation)

| type = Formation

| age = Permian

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| region = Wyoming

| country = United States

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File:Ayres Natural Bridge (west of Douglas, Wyoming, USA) 11 (49144682401).jpg, consisting of sandstones from the Casper Formation]]

The Casper Formation is a geologic formation in Wyoming, US. It preserves fossils dating back to the Pennsylvanian period.