POTD April 17, 2015: San Rafael Swell, Emery County, Utah
San Rafael Swell, Emery County, Utah
Photographer: Taylor Boden; © 2014
Erosion has exposed and sculpted Jurassic-age sedimentary rocks in the southern San Rafael Swell. Near Goblin Valley State Park, towering Wild Horse Butte comprises the Morrison and Summerville Formations (top cliff layers), Curtis Formation (middle slope layer), and Entrada Sandstone (bottom reddish layer).