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Decorah Impact Structure
March 18, 2013 | University of Iowa

“Recent airborne geophysical surveys near Decorah, Iowa are providing an unprecedented look at a 470- million-year-old meteorite crater concealed beneath bedrock and sediments. [...] The extent of the shale, which was deposited after the impact by an ancient seaway, defines a “nice circular basin” of 5.5 km width.” Quoted from the University of Iowa press release.


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