King Phillip's Woods like Quisset Woods

After just seeing these things in Woods Hole and reporting on them, they showed up again at King Phillip's Woods last weekend. A stone wall starting on one side of an outcrop and then extending as a short stretch down into the waters of the wetland:It reminded me of the short stretches of wall leading down into the kettle hole.

And the adjacent propped rock reminded me of what I called "Mavor's Dolmen".
These places seem designed within a common framework.