 pictographs or petroglyphs but we were really kind of wondering what these confounded fences were all about and we ran into a lot of them over the years and then we finally were threatened after going into one place six times a man who had a Department of Defense ID badge confronted me about going into them and he said look I know what you've been doing in there I know where you've been I know how many times you've been there he seemed to want to establish the fact that he was very certain of who we were and what we had done