And a few steps later I start seeing rock piles.
You can see the piles as hints of darker color in the ferns. And you can see the "grid-like" structure. This was a typical site of this type with water to north, and northwest. The site consisted of several clusters of piles. A stone wall separated these from a small peninsula sticking out into a brook, and there were a few larger more broken down piles on the peninsula, like an older site over in there.
I walked around taking pictures of the rock piles and was particularly enamored of this one: 
Let's look at it from above:
See? It is triangular. Some others:
The presence of one larger rock on each of these piles may be significant. I have been finding rock pile sites with triangular rock piles this fall. It is funny how I seem to find the same kinds of rock piles over and over for a while and then I start finding some other kind of site and get into seeing those over and over. What would explain this impression? I do tend to keep exploring in the same places once I find good stuff there. But this is northern Westford, and I just saw the same things in Fitchburg along Falulah Brook, and in Foxboro at the state forest. So I don't get it. Last spring it was all about rock piles with hollows and, frankly I enjoyed them so much this is what I have been hunting for. But now I just keep finding triangular rock piles. Over by a stone wall, a different collection of piles. The layout of the piles, evenly spaced along an arc, is evident enough:
Just to the right in this picture was one pile that was different from all the rest: a broken down platform? 
Or could it be my old friend: a rock piles with hollows? I don't know, it was too far gone. It would have been like a focal point to the arc of the other piles.Here are some of the "older" piles, on the peninsula:
These are long gone.
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This is the southern /western edge of the open water along Keyes Rd. in Westford just south of the Tyngsborough line.
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