Went out with the ladies from Harvard and one of the places we checked was Jocelyn Hill in North Leominster. For some reason, when I first saw the rock piles along the southwestern brow of the hill, I thought they looked sort of random and "rock disposal"-y. But when I got home I realized they were more systematic and "mound"-y. This picture from Sydney Blackwell helps to see it:
Closeup of the first one - look at the details:
Here is a smaller auxiliary pile - which also should have made me realize this site is not about rock disposal:
For clarification, here is what I mean about pile orientation:
As I look at the pictures I see other details, the last photo and the one two before it are hard to tell apart - with the same large rock tumbled off the lower edge. But those are different piles. Also, if you look at the lower edge of the "structure" in the 2nd picture with Gail, it forms a zig-zag continuing the perception of a common orientation for the whole collection of piles.