A knoll in Sudbury next to water

This is a small site. I was barely sure it was not just some rock piles out beyond the end of a stone wall placed there for future wall building (see blurry video). But there was a lot of symmetry to those structures and, later, I found several rock piles that were not in line with the wall.

Overall there were maybe six low, very smeared, rock piles.

No, this is a genuine rock pile site, not a bit of unfinished wall building.