Field trip in Holliston with Matt H and Curt H.

Matt Howe showed me and Curt Hoffman some nice rock piles on private property in Holliston.

We saw a small group of piles, possibly a grid, near a wet place, and then walked behind houses and through swamps and saw site after site. 
Here was a smeared, slightly rectangular mound:

Another view:

Looking at some outliers to this mound:

 In detail:

and

We continued on and saw isolated rock piles and small clusters, everywhere we went.

 I like old ones like the above and here are some familiar sights: a gap

a ring:

 Thanks to Matt for a nice walk.