Its a berm! It's a mound! It's super-old!

First of a couple posts about Elmer G Raymond Memorial Park in Pelham NH. Found this up the brook that runs below the parking lot and goes upstream west of the playing fields. At the time I thought it was a well placed mound but it turned out to be a berm of cobbles running up the side of the ridge like a ramp, ending at the lookout over the brook. The beginnings of this berm were up the valley, where it merged with more conventional stone walls.

A few moments later: