Along the Green River, Dinosaur National Monument, Uintah County, Utah. Photo by Jen Miller.

Henry’s Fork, High Uintas Wilderness, Summit County, Utah. Photo by Christian Hardwick.

Morning sun casts light on the reddish-brown and grayish-red sandstone, shale, and siltstone of the Precambrian-age formation of Red Castle in the Uinta Mountain Group. Ice-age glaciers carved the broad valleys and basins of the Uinta Mountains.