The Iowa Geological and Water Survey, in partnership with the U.S. Geological Survey, have found evidence for a 3-mile meteor crater under the city of Decorah, Iowa, that appears to have been formed in the Ordovician by a 200-meter wide meteorite. [Right, 3-dimensional view of Decorah, Iowa and the Upper Iowa River. Scene is looking due north. Credit, USGS][Below, maps showing electro-magnetic, well data and aggregate results over the crater. Credit, USGS]
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