1 / 10 2 / 10 3 / 10 4 / 10 5 / 10 6 / 10 7 / 10 8 / 10 9 / 10 10 / 10 ❮ ❯ Michigan was high and dry from the mesozoic and later, the ages for these types of teeth (except for the great lakes which are fresh water).