Geology of Sinks Canyon State park

Sinks Canyon State Park is nestled on the eastern slope of the Wind River Range near the city of Lander. The park hosts a variety of interesting geologic features, from rock formations 500 to 280 million years old that formed from ancient seas and coastal sand dunes, to young glacial deposits. The highlight, however, is “the Sinks,” where the Middle Fork of the Popo Agie River disappears into a cavern only to reappear about a half mile down the canyon at “the Rise.”