It is definetly a "game ball " ( in my opinion ) .
Main proof is that it is a flint rich camp area and not a stream bed, possibly brought home by Dad for the kids.
Because of the I tend to a natural formation, ridges very similar to that one are very common on steinkerns of various clams but the very round symmetry of yours is intriguing
Might have known you would be out in the camp right after a big . . . .Tks for the showw
Thawed out and now in the rainy season. Got a whopping 1/2" over the last 5 days. All the critters are out and we finally got some good bear pic's. Of course those were taken over the shoulder while in a running sprint.