The White Rim Trail offers an excellent opportunity to observe nearly the complete succession of rocks exposed in the Canyonlands region of Utah. The trail is actually a dirt road that begins near the top of the Jurassic Navajo Sandstone and descends to the Permian Cut- ler Formation. The road was originally built by uranium miners to transport ore ex- tracted from the Triassic Chinle Formation during the middle part of the twentieth century. The mining road followed the path of a large natural rockfall that buried part of the typically cliff- forming Wingate Sandstone. Although the road has been greatly improved by the National Park Service, the Shafer Trail access is still extremely steep and it travels along the tops of sheer cliffs.