Stone lines of different kinds near Flat Rock Hill, Fitchburg

This is a full view of the wall with rock pile "bulge" from the other day.It might be damaged but I cannot see why the wall would be borrowed from in different places with a rock pile in between.

This one is from east, up the hillside, on the way from the Audubon parking lot on Ashburnham Hill Rd to the Overlook Reservoir.Further up hill there was a continuation of wall - more substantial and taking a few zigs and zags leading up to the summit and the small site with quartz from the (other) other day.