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Ames crater

Ames crater is a meteorite crater in Major County, Oklahoma, United States. Ames, Oklahoma is near the center of the structure, which is 30 miles southwest of Enid, Oklahoma. Buried under a thick layer of sediment, it was not discovered until... Wikipedia
Age: 470 ± 30 Ma; Middle Ordovician
Diameter: 10 mi (16 km)