Doesn't look familiar. If some people on here could see the other pieces it might help identify.A friend of mine found this a other similar pieces in his garden spot in Greene County.
This is the only pic I have. I do recall and you can sorta see there is a "seam" of sorts around the edge. All of the "images" if you will are slightly raised. This was the most impressive piece I saw of those he had.What's the cross section look like and possibly any other angles or similar pieces would help.