The Carlisle MA town boundary pile

This is said to be marking a boundary (corner?) for Carlisle but I believe it is a bit much for such a humble purpose. Also this is one of several very large rock piles from only this one part of Carlisle (near South and Cross Streets).The other large piles are not on any town boundary.

I have shown this pile before on this blog. Going back to visit it, there is a lot of internal structure visible. The upper edge of the pile has a curved concave shape, there is what appears to be an "on ramp", and there is some sense of multi-levels and other structure.