Another Wrentham Pavement - Sheldonville example

Leaving Birchwold, driving back towards the highway on 121 I glanced left and saw this under the phone lines [at the cross hair on map]:

I parked hastily and went to look. To the left of it was a smaller pile:

And to the right and downhill of it there were some other features. But first:

I note that these "pavements" are neither rectangular, nor do they have much in the way of hollows. Here we are downhill from it:

Looks like a small circle in the background.

It is interesting to find this example of a pavement. Compared with the ones down the road at Birchwold it is in much better shape and some auxiliary piles are visible, suggesting related functions.