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A 74-million-year-old meteorite created Iowa’s largest known crater, shaping local geology and water quality.
A 74-million-year-old meteorite impact created a 22-mile-wide crater in west-central Iowa, the largest known in the U.S., during the Cretaceous Period.
The over-1.5-mile-wide space rock struck at 38,000 mph, devastating a 250-square-mile area but not causing a mass extinction.
The site near Manson remained buried under sediment until discovered in 1959 after glacial retreat.
At the time, the region was under an inland sea, and the impact destroyed limestone, contributing to the area’s soft water today, unlike the hard water found elsewhere in Iowa.
The event left a lasting geological and hydrological imprint on the region.
Un meteorito de 74 millones de años de antigüedad creó el cráter más grande conocido de Iowa, dando forma a la geología local y a la calidad del agua.