Old structures along an un-named tributary of Rocky Brook, Stirling MA

A few old things along the edges of the level area by the west side of the brook:Not sure what this might have been:Then, on the other side of the brook, a pair of larger piles:(from the other side)Here is a better view of the smaller one:It shows signs of careful construction but I try to be a little suspicious of the rock piles. Uphill and a bit upstream from these were some other more loosely scattered rocks, possibly from field clearing or possibly a smeared remnant of a destroyed rock pile; it was hard to say. There was quite a lot of that tourmaline granite in there.
(Nice rock in the foreground.)