Three clues:- It is isolated, no other rock piles nearby
 - It is at the angle of repose for rocks dumped in one spot
 - There are pieces of cement blocks mixed in with the rocks
 - Some evidence of earth moving nearby
 
This is about rock piles and stone mound sites in New England. A balance is needed between keeping them secret and making them public. Also arrowheads, stone tools and other surface archaeology.
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