POTD July 22, 2014: Arches National Park, Grand County, Utah
Arches National Park, Grand County, Utah
Photographer: Don DeBlieux; © 2013
Dissolution of subsurface salt caused the collapse of the Salt Valley anticline, forming vertical fractures in the Jurassic-age Entrada Sandstone. Weathering along the fractures has produced the spectacular fins, towers, and arches in the Devils Garden section of Arches National Park.