Just glancing at the topo map of Bolton I am sure most of those little patches of green have rock piles in them. So far, with a couple of exceptions, all the ones I have checked out there do. However there are still a lot more of these green patches and I am thinking I still have a lot of work to do checking each one. Perhaps some reader lives out near Bolton - could you please help? It is so much fun locating sites. You start in on the rest of Bolton and I can get going on the other side of the Nashua River Valley.