(achicagosojourn.blogspot.com)
Nearly everyone for the Calumet region, has driven across it. Its giant size, led me to believe as a child that this was the grand canyon. I can vividly remember my father telling me No that is very small compared to the grand canyon. Thornton Quarry is one of the largest commercial limestone quarry's in the world. (Schoon p.14) The Quarry was formed as several reefs growing in warm, shallow sea environment. It is composed of shells of coral animals (Schoon p.14)
(middlecitymosaic.blogspot.com)
The Thorton Quarry was home to a giant reef system, during the silirian period.
http://www.museum.state.il.us/exhibits/changes/htmls/tropical/underwater_silurianreef.html
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