Melting Shadows (Utah, USA)
Stone vertebrae snag morning's light along the northern tip of Utah's Bridger Jack Mesa (foreground), leaving Lavender Canyon hidden in a cold, purple shroud. Upper layers of the mesa are composed of what geologists call Wingate sandstone, deposited about 200 million years ago when sand dunes hundreds of feet thick carpeted the region. Weird and wild rock formations abound on the 130,000-square-mile (340,000-square-kilometer) Colorado Plateau, prompting one early settler to describe it as "the roughest country you or anybody else ever seen; it's nothing in the world but rocks and holes, hills and hollows."