wmpe2000:
trail running through grandiorite with the reddish boulder showing some mylonitic deformation
wmpe2000:
Nicotiana obtusifolia - desert tobacco, used in ancient indigenous rituals, can be found near petroglyphs found along Holbert Trail
wmpe2000:
near the beginning of the trail - petroglyphs scratched into the rock's weathering patina by the Hohokam peoples between 450-1400AD