Short Stretches of stone wall - Warren Brook Upton MA,

Another scene from the Warren Brook Watershed Conservation Land on the Upton/Grafton line. A couple of pieces of stone wall:And viewed from the other end:Nicely built and all; this is not in any way broken down or ruined. What the heck were the builders up to? This is only superficially like a stone wall.

A few paces away, next to a brook:
The ground uphill from the wall almost looks dug out. There were no other walls continuing the line of this short stretch. Again, what the heck is going on here? Maybe something to do with shadows.

This is a quarter mile north of the end of Oak Knoll Rd.