From Wikipedia:
The petroglyphs were carved by Native Americans during both the prehistoric and historic periods. Some glyphs depict riders on horses. While precisely dating the rock carvings has been difficult, repatination of surface minerals reveals their relative ages. The reason for the large concentration of the petroglyphs is unclear, making the rock somewhat of a mystery.
There is a Navajo family that sells homemade jewelry in a little booth in the parking lot that is quite nice. Cash or check only.
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WikiGallery by Stefan Schimanski at http://1stein.org