Bryce Canyon National Park Trails Professional Review and Guide
"When we hiked in Bryce Canyon, I frequently heard the distinctive rumble of a rock avalanche beginning and ducked under an overhang in time to escape a small shower of stones and dirt. Erosion! The major force at work was brought powerfully home. Horizontal beds of limestone, sandstone, and shale on the eastern edge of Paunsaugunt Plateau are so erosion prone that a mind-numbing array of fins, turrets, pinnacles, and spires has formed.
Spires and pillars stand as tall as 1,000 feet and are surrounded by a wild architecture of natural forms resembling cathedrals, temples, ruins, dragons, gargoyles, and every other form that may come to the imaginative mind. This trail guide includes descriptions of Riggs Spring Loop Trail."