It maybe a little off subject here. But there is a place on my dad's land down in GA in a field. Far as I can remember nothing has ever grown in a corner of field we own. The size of this area is mayb 2 acres. It never fails after every rain we find buttlaods of arrowheads, hell when I was 12 I found a stone ax sticking out of the ground. We have never done any research on why nothing will grow there. Kind of like a mini desert, funny I think. But over the years we have amassed a good collection of arrowheads, spearheads and at least one ax that I know of. You name the type of arrowhead or spearhead we have probably found it on that patch of sand.