Recall that the unusual feature at the earlier site was "mound with hollow" that was triangular and, so, a bit different from all the other examples of mounds with hollows that I have been looking at. The hollow was not all that clear - as much something I wanted to see as it was real. So I am poking down towards the lowland's edge and see a rock pile that, upon inspection, seemed to be crescent shaped:

To my surprise, I found another, slightly smaller, a few yards away: