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Chicxulub A small town on the Yucatan Peninsula, Mexico, that has been identified as lying within the crater formed by a major impact event dated at about 65 Ma ago. The crater is about 195 km wide, has a multiring structure, and could have been made by an object about 12 km in diameter, the impact believed to be the event associated with the mass extinction marking the end of the Cretaceous Period.

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