Rock piles and Maiden-hair ferns at the foot of Barret's Hill - Bolton, MA

Maiden-hair fern is not common this far north:
It is a delicate fern with an unusual leaf shape. The black stems are favorites for colored basketry. Here was a simple rock-on-rock a few feet from the ferns.
And here are a couple of views of a solitary rock pile that seemed out of context. It did line up with one of two walls that made a corner nearby.
If you care to go poking around at the edge of the wetland there, along the edge of the western foot of the hill, you'll probably find these things.