Horseshoe Canyon Trail Professional Review and Guide
"Horseshoe Canyon contains what is probably the finest display of prehistoric Indian rock art in the United States. The famous Great Gallery, largest of several Horseshoe Canyon sites, is 200 feet long, 15 feet high, and contains dozens of intriguing red, brown, and white pictographs. The paintings are at least 2,000 years old, and possibly as old as 8,000 years.
The descent into the canyon is made on a slickrock trail with rock cairns. Inside the canyon a vague trail winds along the bottom of the sandy wash. The canyon is quite hot in midsummer, so carry plenty of water."