From Kayenta, Az take US163 to Mexican Hat, Utah. Navajo Nation Reservation, and is accessible from U.S. Highway 163. The Navajo name for the valley is TsÃƒÂ© Bii' Ndzisgaii (Valley of the Rocks).
The valley's vivid red color comes from iron oxide exposed in the weathered siltstone. The darker, blue-gray rocks in the valley get their color from manganese oxide. The buttes are clearly stratified, with three principal layers. The lowest layer is Organ Rock shale, the middle de Chelly sandstone and the top layer is Moenkopi shale capped by Shinarump siltstone. The valley includes large stone structures including the famed Eye of the Sun.