This is Bruce McAleer's photo:Bruce pulled the car to a stop and I said: "this is too flat for rock piles". This rock pile was right next to the car at the edge of the road where we stopped. It looks a little like a turtle, a little like a field clearing pile. Because of its nearness to other piles it is probably is not simply from field clearing.
We walked into the woods and found a number of very nice piles besides the elongated ones I mentioned here. For example these nice ones under the hemlocks.
Also this rather unusual oval outline or rocks:
This site led from the flat to the spring to the slope, seen in the previous photo. And then along the level shoulder.