Abutment across a gully, old marker piles, etc. in Princeton and Sterling

With reference to the map shown here and to the 2nd and 4th folds described, here is what I found in the 2nd fold. I don't know whether to call it a "wall" or a "turret" or a "linear feature" (a cop out), or something else ("abutment"?). Let's take a look at some overviews and some details.

A structure, built across the top of the gully (we are in E. Princeton):

There is a well built gap at the center. Not visible on the  right was a continuation of wall, starting with a rectangle with a hollow. So, looking back at the main feature, here is that rectangle with hollow:

The main pile is off to the left in this picture.
Here is a view from uphill:

It is more a "staircase" than a "zigzag". Here is a view from the other side:

Sorry I did not get a better picture of the gap in the middle, or the whole setup from this view over to the far side with the hollowed pile.

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Somewhere in there I came across what could have been an old foundation or could have been a burial. Don't remember where:

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Then later (now in W. Sterling), at or around the 4th red outline on that map, I found some old broken down piles that seemed more or less in rows and more or less evenly spaced. What I call "marker piles", which I imagine are akin to a sundial.

The piles seemed a bit triangular.

There was an old road nearby, with stones along the side.

And there was a lot going on that was obscured by the decrepitude.

It is unusual and extremely gratifying to find sites like this in Sterling, not too far from that main site I found a few weeks ago

It was heartleaf lilly weekend. With trillium!