Western Parker Hill, Fitchburg

With apologies, it was raining and I am not sure where I was. The lower outline is one cluster of 3 or 4 larger run-down mounds. The new mounds and piles I found were somewhere in that upper outline, but not sure where. 

This (believe it of not) is a rectangular stone mound, with a hollow on the right. It faces north and west out over the Whitman River (start of the Nashua). With slightly more surrounding context:

Also from in there, closer to the wetland up on the hill (still in that upper outline), an old double-chambered thing:

Way up in there, near the highest point of water, there was what looked like an only mill: piles next to the water, and a causeway/dam.