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Ancient Puebloans inhabited Arizona's largest cliff-dwelling site for 50 years, and then deserted it.
Restricting the use of bolts, NPCA and others have argued, would reduce litter, protect cliff-dwelling plants and wildlife, leave rock faces free of drilling damage, and limit markings from the chalk climbers use for a better grip.
The trip includes visits to picturesque Arch Canyon and Hotel Rock, the ruins of the cliff-dwelling Anasazi Indians.
Although he has not dated samples of the cliff-dwelling trees, he notes that they appear very similar in form to the cedars on the Niagara Escarpment.