Could it be an Indian discoidal stone? I found one in Pigeon Forge TN. I pick it up off the ground because it looks unusual. Investigated and found they played a game kinda like horseshoes. Just a river rock shaped up for tossing.I’d call it one if I found it around here.
Lots of signs of being used. 👍On a grinding stones and Manos, look for paterns and evidence of wear.
Here’s an example that I found in CT.