One way to keep yourself oriented while traveling in the backcountry is to look around at reference points. Even though we were on a well-signed, well-mapped route, it was still nice to look up at the White Mountains to the east and see the telltale hues of the Spark Plug Mine. For the record, these colorful rock outcroppings are naturally occurring. The Spark Plug Mine used tunnels, not an open pit.
The petroglyph areas are easy to see, as the BLM has created fenced parking areas complete with interpretive signs. A footpath leads to the petroglyphs.
One thing we weren't expecting was a flat-topped rock, pock-marked by grain-grinding divots. Also called mortreros, these indentations were used for grinding grain into flour by the ancient local tribes.