Iowa Meteorite Crater: Long-Hidden 'Decorah Impact Structure' Revealed

5min Knowledge

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Buried beneath the rocks, dirt, buildings and roads of the city of Decorah, Iowa, lies a 470 million-year-old meteorite crater. Unlike the craters on the pockmarked surfaces of the moon and Mars, this crater can't be seen by looking down at Earth's surface, at least not by the human eye.