manson crater

The Manson impact crater is located near the site of Manson, Iowa where a meteorite landed during the Cretaceous Period, 74 million years ago. It was one of the biggest impacts by an object from outer space to happen in North America and was previously thought to have led to the extinction of the dinosaurs until age dating tests proved that it was too old. Not much remains due to coverage by glacial till and the site where the crater lies buried is now a flat landscape. http://www.uhaul.com/supergraphics/crater/sg.html

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