It has been shown that the site was buried with sand non-native to the hill it sits upon. The fill was transported there by Human Conveyance, as they say. Whether the place fell into disuse due to changing belief systems, or could not be supported because of the increasingly dryer climate remains to be discovered. But the fact is, the site was buried with purpose and no doubt done with appropriate rituals directing it.
Fascinating place, and the more they discover the weirder it becomes.
Something is not right. This message is just to keep things from messing up down the road