A drive south along the Notom-Bullfrog Road offers views of the Waterpocket Fold. The monocline, or one-sided uplift of the Earth's crust, is a premier example of the bending and folding of rock layers. The Waterpocket Fold is notable for its great length of multiple layers of exposed and carved colorful sedimentary rock. The monocline extends from Thousand Lake Mountain in the north to Lake Powell in the south.
Crustal pressure reactivated an ancient buried fault deep within the Earth, causing the overlying sedimentary rock layers to uplifted and folded. Today this monocline appears as a steep slope that ends in an abrupt cliff line. The east side of the Fold is tilted as much as 60% from the normal horizontal which caused accelerated stream erosion to occur. An estimated 7,000 feet (2,134 m) of overlying rock has been eroded away since the formation of the Fold, 60 million years ago. The west side, or escarpment face, is a near vertical cliff line and a formidable barrier to travel.
Geological features provide a source of park names. The vast expanse of white Navajo Sandstone atop the sloped side of the monocline is dotted with numerous natural tanks or potholes that collect rain water, contributing the name "Waterpocket" Fold. Navajo Sandstone domes resemble the Capitol building, hence the name "Capitol." Many early prospectors were former sailors who likened the vertical cliffs of Wingate Sandstone to a barrier common in nautical travel: a "Reef."