The petroglyphs on the rock outcrop shown here are an excellent example of rock art left by the Hohokam Indians, believed to have dwelt in the Valley of the Sun between 700 and 1450 A.D..
Petroglyphs are designs etched on individual boulders or rock outcrops depicting people, game (deer or bighorn sheep) or geometric patterns ranging from interconnected spirals to squiggles.
Most of the petroglyphs on Hayden Butte Preserve are located on the south slope adjacent to the Arizona State University Sun Devils Stadium. Sadly, many of these ancient works have been damaged by vandalism.
See them for yourself here: