re: behind the...umm... hill
They're hidden by the hill :)
You can see some of the tracks down by the Larrys Lookout and Jibsheet outcrops.
The root to the foot of the hills, from there to Cahokia and Cahokia all the way around to Larrys Lookout, is over the far side of the hill, and the route from there around to the summit is hidden as well - just the last few tens of metres is visible on the top of the hill
Doug