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Your window sill may show glimpse of prehistoric world

May 10, 2011 6:54:36 PM- chicagotribune.com
Limestone in Chicago's windowsills and steps harbors a trove of prehistoric creatures

Chicagoans do not have to venture to the grand halls of the Field Museum to study the fascinating ancient natural history of the Windy City. They simply need to look out their windows or walk down their front steps.

USA, Illinois: (Latest Stories)