Wow. Interesting.
How does this line up with the one in England?
What is most significant about this find and not even mentioned in the article is that this site was created when the great Lake Michigan was at least 45 feet shallower than it is today.
Which means that there had to be such a substantial change in natural climate temperature as to affect the melting of glacial ice masses that were in existance at that time in order to raise not only Lake Michigan but all the other great lakes to the level they are at today...........No SUV's