
Once cleared, the piles can be seen to be more or less evenly spaced and in lines - characteristics of what I call marker piles. Here, the lower version of the picture shows where the piles are circled in red. Looking northwest:

Interestingly, the newer wall was built along the side of a "rectangular" structure:
There was another pile, on a boulder, up here in the flat area, and I saw one other off to the side, but that is all I noticed. So here we have quite a combination of anomalies on one part of the woods: an array of rock piles, older walls, a rectangular ruin against the newer wall, and also a very nice larger mound on the flat place to the east of the site. It turns out, looking at my topo maps that this flat place is the highest point - or at least the highest field (cuz I am ignoring a nearby crag)- in this eastern part of Estabrook Woods. The mound would be visible from a long way away. Here is the "MAPNIK" view:

Look how even the larger mound is nearly invisible from a few feet away: