When we were at Arches National Park near Moab, Utah, we followed a path to these petroglyphs. They aren't real old. They picture horse and rider along with bighorn sheep. Petroglyphs are just etches in rock, so the only way to date them is subject matter. Horses didn't get to North American until the Europeans arrived, so this rock art can't date any farther back than the 1600s. They are the work of the Utes who gave the state of Utah its name.