An interesting site near Gibbs Mountain

The leftmost blue outline is on one of three rock pile sites I found on Saturday while exploring in the vicinity of Gibbs Mountain in Marlborough, MA. I posted a short video earlier (here) and want to do my best to describe this place in pictures.
The site is the northwest-facing slope of a level knoll, with stone walls coming to a corner at the back of the knoll. The slope is flat (but not level). Here is a sketch. I tried to make it a faithful rendering of the what can be seen in the panorama photos that follow:I am struck by a herring-bone pattern that is new to me. Do you see what I mean?

Here is a view back down:Sure looks as if the soil is pushed down between the piles. Let's take a closer look at that:
Again:The meaning hovers beyond reach. But there is something a little familiar about this place. With a sense of some alignment and some even spacing it is like a marker pile site. Perhaps we are catching the phenomenon at a certain point in its evolution. Or perhaps this is something else entirely. Certainly the herring-bone is unique in my experience.
Here is a view from within the site of where the walls meet behind.