Fist off, I doubt most of you know what a Petoskey stone is. It's Michigan's state stone, found primarily around Little Traverse Bay and the city of Petoskey, thus its name. But it can be found in any rocky area in the north part of the Great Lakes.
Petoskey stones are really fossilized corral, that grew in a sea that covered Michigan 360 million years ago. 360 million.....
Those seas eventually became the glaciers that carved out what are now the Great Lakes during the last great ice age. Those glaciers too receded during a period of "global warming" or Lake Michigan would just be a hole under 5000 feet of ice.
Anyway, I just thought you might like a little historical perspective. Go form your own opinions, but mine will always be that Al Gore is a dumbf**k.