From NPS: The Waterpocket Fold defines Capitol Reef National Park. A nearly 100-mile long warp in the Earth's crust, the monocline is a "step-up" in the rock layers. The rock layers on the west side of the Waterpocket Fold have been lifted more than 7000 feet higher than the layers on the east. The Waterpocket Fold formed between 50 and 70 million years ago when a major mountain building event in western North America reactivated an ancient buried fault. When the fault moved, the overlying rock layers were draped above the fault and formed a monocline.
"Waterpockets" are basins that form in many of the sandstone layers as they are eroded by water. These basins are common throughout the fold, thus giving it the name "Waterpocket Fold". Erosion of the tilted rock layers continues today forming colorful cliffs, massive domes, soaring spires, stark monoliths, twisting canyons, and graceful arches.
Capitol Reef National Park contains nearly a quarter million acres in the slickrock country of Utah. Plant and animal life is diverse because of a variety of habitats such as pinyon-juniper, perennial streams, dry washes and rock cliffs.