Stumbled (literally) onto some near-completely buried rock piles, while exploring the north eastern edges of Esterbrook Woods on the Concord/Carlisle line. Some preliminary videos may give a sense of the place. Later I'll show photos showing these piles are evenly spaced and -sort of- in lines.
But across the way a level spot which is the high point of Eastern Esterbrook woods had a very nice elongated "mound" which, if there were no trees, would have been visible from a great distance. Perhaps its shadow would reach down into the dell but I do not think so.
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