We visited this site with Guy Starbuck. Be sure to check out his writeup of it!
This site is really strange: out in the middle of nowhere, not close to any other sites or habitation sites. We looked all over in the area surrounding this site, excited, sure there would be more to see, but – no! We found a whole lot of nothing. Heh heh, sometimes that’s how it goes.
This site is probably Serrano, but it is hard to say. The tribal boundaries are not that clearly defined around JTNP. The complete lack of other artifacts like arrow points or pottery sherds makes it even harder to place. Some of the elements, like the crosses, also occur at some other isolated sites in the region, and sometimes at petroglyph sites too.