When we went over to the coast last year, we saw a 3-D movie that showed animations (big, toothy ones) of the prehistoric ocean life that swam over what is now Kansas. It was most impressive, especially when the big critters came leaping straight off the screen with their mouths open.
The midwest doesn't have the only former-maritime claim, though. Bakersfield, California, (yes, Bakersfield) was once the home of similar large toothy creatures. Here is an example of the toothiness, and an article about the head bone, the neck bone, etc.