Short stretch and marker piles at Henry's Hill - Framingham, MA

This is Sudbury Valley Trustee land. I took a couple pictures of the site there, while coming back from an unsuccessful hunt around the edges of the larger woods. The site is on a little knoll, not the main hill and I always took it to be a typical marker pile site with vertical sided piles.

This time I noticed the highest point of the knoll had one short stretch of wall and a final rock pile:

Looking down the wall from the top, it is about 15-20 yards long. An interesting feature.

On the way out: