Looking for more mounds with hollows, I went to the next further north hill in Dunstable. It is called Flatrock Hill and is within a mile or so of the southern edge of Nashua NH. Maybe I did not see any because I still, reflexively, head up the hills rather than down into the flats. I thought the valley between Blanchard Hill and Flatrock Hill might be interesting and there was a standing stone with gunsight there:
The name "Flatrock" suggests either a single notable flat rock or else a geology of flat rocks. It turned out to be the latter and the hill was all chopped up with quarries. I climbed thinking there might be something made from quarry debris at the top. Just a little: 
But there was nothing notable for a while. Later, having made the circuit of the other hills, I stepped across the wetland between two of the smaller hills and into a very green place, full of rock piles in different stages of disrepair.
A pretty place, a field gone back to woods:
I'll show you some of the pictures but the main point I wanted to make about this site was that it seems clear there are piles of different ages. Some older:
Some newer:
Otherwise... Please look at the Symmetry:
(another view:) 
and here:
Please look at the Shape: 
I did not find the Wachusett Tradition but I'll remember the green. 
The map:
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