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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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‘Relatively minor’ and decreasing: Supervisors receive report on the status of Johnson County’s main groundwater source

The title of the report presented to the Johnson County Board of Supervisors during its work session on Wednesday was very technical: “Simulation of Groundwater Flow in the Silurian Aquifer, Eastern Iowa (2020–2045).” That was appropriate given the complex nature of its subject matter. But the report’s ultimate message about the groundwater supply much of […]

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