Of the canyons that break the eastern edge of the Staked Plains, Palo Duro is by far the most spectacular. As one approaches the edge, the earth opens up into a vast gash, a geological and ecological wonder. And whether you come to Palo Duro as a novice or veteran canyoneer, the thrill and the mystery are always intense. How did the canyon get here? What caused the vari-color of the walls and formations? Why do some formations stand completely separated...