Located this panel safe and sound after some helpful guidance. It had been buried under a pile of small rocks and was a little muddy. After cleaning it by pouring lots and lots of water over it, the full designs became easy to see.
This is a very nice example, both cup and rings are kind of egg shaped and one has a gutter that runs uphill, the other has a large and deep natural hollow that was incorporated into the outer rings of the other design. An odd little panel.
I covered it back up as found, putting some sods of grass and mud on the designs to ensure I didn’t damage them when I placed the rocks back over the panel. Great to see the panel is safe and sound, hope it stays that way.