A hiker explores the beautiful slot of Crack Canyon on public federal BLM land in San Rafael Swell, near Goblin Valley State Park, Utah, USA. As part of the Colorado Plateau, the San Rafael Swell is a giant dome-shaped anticline of sandstone, shale, and limestone (160-175 million years old) that was pushed up during the Paleocene Laramide Orogeny 60-40 million years ago. Since then, infrequent but powerful flash floods have eroded the sedimentary rocks into valleys, canyons, gorges, mesas, and buttes. The Bureau of Land Management (BLM) is an agency within the United States Department of the Interior that administers American public lands.