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A mile-wide meteorite left a geological 'anomaly' in western Iowa — and killed lots of dinosaurs
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A mile-wide meteorite left a geological 'anomaly' in western Iowa — and killed lots of dinosaurs
Since 2008, Manson’s city sign and slogan, “Making an Impact,” have referenced the meteorite that crushed and scorched the earth there 74 million years ago. — ©Google, July 2025 The first anomalous thing people living in Manson noticed was the water. Iowa’s groundwater typically has a fairly high dissolved mineral content, mostly calcium and magnesium, absorbed as the water passes over and through the limestone formations underlying the state. I…
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