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A mile-wide meteorite left a geological ‘anomaly’ in western Iowa — and killed lots of dinosaurs

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. It’s considered “hard water.” But water coming from wells in the small western Iowa town, […]

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