We have visited this site a couple of times over the years. The first time was in 2003 with Cat and Brad. We stopped by again in 2011 and the site looked mostly unchanged. This place is way out in the middle of nowhere.
The petroglyphs here are carved into light volcanic ash. It is easy to cut into and also easy to erode. Weather is slowly eating them all away.
There are a few vulva glyphs here and this is likely a female puberty site.