
This is about rock piles and stone mound sites in New England. A balance is needed between keeping them secret and making them public. Also arrowheads, stone tools and other surface archaeology.
It was part of an extended uneven heap of rocks forming a kind of ridge running down along the side of a pool of standing water, a little pond, to the right in the photo above. Here is a picture of the ridge, pond behind us. In this picture the wall and the bulge are to the left:
I expect this is agricultural but wonder why the rocks are on the high place, rather than a lower one. Note the uneven sub-structures.
Went walking at a hill in Shirley which I know has rock piles on it, deciding to explore a part I hadn't been to. And I saw only the faintest of traces in several places. Once, where my path was obstructed by a fallen tree, I stepped aside and saw a pile I would have missed:
It turned out to be one of four or five along the foot of a hill at the edge of the wetter ground that dropped off to the northwest. Several of these other piles had noticeable pieces of quartz in them (sorry for the bad pictures): 
Here, the quartz is part of a larger rock:
The light was not too good. Were these really ceremonial?
"There are no 'ancient Indian temples' in the Gungywamp area since it is a well known fact that nomadic and semi-nomadic Native Americans in the region did not construct temples of hewn or field stone . . ." gungywamp.com
And here, again, is Larry's photo:
A little gem from an eastern Concord corn field.
Around here, mylonite is said to be from Sudbury. It is often green, slightly translucent, and sort of jade like. This is a "Merrimac" point type called a "Stark point". They are from the Middle Archaic 3-5K BC.
I nearly missed it as I stepped over it - it was the same color as the dirt.




This is a lot like the "Horned Creature" without the horns. See for example the discussion of Uktena here (scroll down). Here is a closeup:
And a nearby companion pile:
I think there is significance to that. This is a pattern I have seen three times: here, in Westford, and maybe also here.

These are pretty nice rock piles:
But there was something suspicious about them. For example, dirt on top of the boulder is not right:
I leave it as an exercise for the reader to find the other more substantial sites in there.

[Had to use the flash. It was raining harder and harder as I proceeded.]
Looking at the map fragment I can see there is quite a lot more territory to explore in there (I stopped early cuz of the rain). Think of this as you drive past.
..down into a little valley, the first hints of rock piles:
and plenty of ambiguity as to the nature of the piles, of which there is quite a variety in there:
Here is FFC looking at the remnants:
We have just come down the hill shown to the left in the picture. But following the rock piles and the clues, led back up the valley till we were only a few yards from the field where we started.
These piles were more or less evenly spaced and in lines. Here, FFC stands over a pile in line with the two others in the foreground:
The spacing was about 9 paces between adjacent piles. Funny that ~9 paces and ~13 paces are such common pile spacings. Nice to know that there is another simple marker pile site in my neighborhood. If you look at the wider angle photos above, I took them standing on another small knoll directly next to the one with the rock piles. I was attempting to find a place where I could stand and see all the piles at the same time. I felt that was possible from this other little knoll, so that we could look at the piles towards the west over a near horizon, with the open field in the background today.


I want to say I am seeing a more prominent rock poking out the top of some of these piles but with there general state of dishevelment it could be a coincidence.
I have said it before, and I do not think anyone believes me, but: most of these rock pile sites are marker pile sites.