I was really struck by the symmetry of the circle. It's absolutely, at least to the eye, absolutely perfectly circular.
If that's exactly what the creators intended, who can say, but it certainly doesn't take a lot of imagination to see that it's eye-shaped.
The mouth of the Miami River would have been a preferred place to be if you were a prehistoric hunter and gatherer.
It suggests it was buried for a purpose. It was buried as an offering.