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Unformatted text preview: deaths of the dinosaurs. Manson's annual celebration is called "Greater Crater Days" in honor of the much-studied yet invisible crater. Manson Crater is located near the site of Manson, Iowa. Evendence is shown where a meteorite landed 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 Manson Crater was too old. No surface evidence exists due to coverage by glacial till and the site where the crater lies buried is now a flat landscape. But, hidden about 20 to 90 metres below the surface is a buried structure about 38 km in diameter. It lies under the southeast corner of Pocahontas County and extends under portions of three adjoining counties.The impactor is considered to have been a stoney meteorite about two kilometres in diameter....
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This note was uploaded on 12/14/2010 for the course ENGL 56990 taught by Professor Jaclyn during the Spring '10 term at HCCS.
- Spring '10