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One of America’s biggest meteor craters is around 100 million years more youthful than researchers believed, which suggests the ancient effect accompanied– and possibly added to– among the most significant international termination occasions in Earth’s history, according to a brand-new research study.

The underground effect structure, called Ames crater, lies in northern Oklahoma and is called after a town that sits above the immersed crater. At around 10 miles (16 kilometers) large, it is the fourth-largest effect structure in the U.S.

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