I visited the petroglyphs at Deer Valley today; I am sooo impressed! The building is unassuming and looks pretty vacant inside at first glance. But the information in center is really thoughtful, homespun and introspective. It's also fast moving because the staff knows you want to get outside and see those rocks!
The outdoor path to the basalt rock mound is wide and clear, though a little scary with all it's "rattlesnake habitat" signs. I'm not gonna lie: the petroglyphs are awesome. There are about 1500 images scattered across the rocky hill, and it seems like they are all facing the same side. It appears that the hill and the the rocks were very important to the people who carved these images and many present day tribes claim symbolism that pertains to their culture is found on the rocks, so maybe it was important for more than one group. My guess is the location was important because it was related to some ancient volcanic activity; that is how basalt is formed.
Anyway, totally rad reserve and museum and clearly i'm a huge geek. the end.