The Shafer Trail, an unpaved road, descends from near the Island In The Sky visitor center into the Colorado River canyon country. The white rim rock of the cliff face is Navajo Sandstone; the ledgey red rock cliffs where the road descends is the Kayenta Formation. Shear cliffs of sandstone are of the Wingate Sandstone. The Wingate and Kayenta formations are of Triassic age, whereas the Navajo Sandstone is latest Triassic to Jurassic in age.