A good petroglyph panel can be found just east of where the Hayduke Trail climbs down into the Barracks and meets East Fork of the Virgin River. It makes for a worthy short diversion before heading down canyon toward Zion. It’s about 1/4 mile upstream and slightly hidden behind brush on the north side of the river. Locate it by going one bend/crack up river from the confluence with Rock Canyon. Once in the right spot, the two -part large, cluttered and slightly weathered panel can’t be missed. There is supposedly more rock art in the bottom end of Rock Canyon itself, but I’ve never explored the canyon myself.