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Someone needs to hypothesize why some structures - piles and walls - needed clean faces on one side. That seems to be the main attribute of these "fishtail" piles.
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.
Here is Google Maps "hybrid" of satellite+road map images. This is a portion of Rt 202 just north of the power lines in New Salem. You can sort of see the gully developing and edging the main site and draining out towards the bottom of the picture.
And here is a topo of the site. We learn from this that the brook is actually called "Manning Brook" that the two hills involved are Andrews Hill and Harris Hill.