Ah, they are pretty walls. The picture Jackie posted shows a serpentine wall much lower than the ones (the duplicates) Flatlander and wwh posted. I don't trust my visual memory for obvious reasons, but it does seem that the ones in C'ville were quite high and the brick was smoother somehow than in Jackie's photo link.

Back to 1745: It's obvious that Jefferson wouldn't have designed serpentine walls, and I would think that because he is so heavily credited with the ones in Charlottesville that we wouldn't expect to find those walls used throughout Virginia prior to his having had them built at UVA, as we seem to agree here.

So, that takes us back to the Virginia fence and what it may have been. Has anyone thought to google the fence itself? I haven't, but will soon.