Found this what appears to be a head of some time of creature. The eyes holes are Perfectly round and symmetrical. It appears to have teeth showing up front and a discoloration where the nose would be also can see the back of a tooth and what appears to be where the spine meets the head. It also has perfect holes where the ears and brain stem would be also it weighs more then a normal rock it's size. It was found by the Mississippi river in central mn.
4 inches long, 3 inches tall and wide.
Found it by the Mississippi river in mn