Last weekend, in Shirley, I went a looking: first down slope to the west of Garrison Rd, then over at the top of the gully running up the northeast side of the hil. Finally I went back to the "V" between Garrison Rd and Townsend Rd to take another look at the piles I know from other there.
I'll just show you one pile from within that "V":
You see a straight line of rocks on the right edge of the pile. Also a piece of quartz near the rear. I am extrapolating to the rest of this pile when I call it "triangular", but I think the triangular shape is pretty clear on these next examples from the Warren Brook area of Upton:(It may take a moment to see this)
Maybe this one is a stretch but it still looks like a triangle:
a detail:
Does it make the case? I know how to measure the "triangularity" but I am hoping it's not necessary. You can see the shape plain enough, can't you?
Here are a couple classics, from Blood Hill, Ashby:
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