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Approximately one hundred terrestrial hypervelocity impact structures, ranging in diameter from a few tens of meters to ∼ 140 km, are currently known. All are on land, with major concentrations occurring on the North American and European cratons. With the exception of three, all recognized structures are Phanerozoic in age, with ∼35% being <100 my old. There is no known structure commensurate in age with an impact event of the magnitude proposed in the hypothesis of Alvarez and others (1980) for an impact-induced biological crisis at the Cretaceous-Tertiary boundary. A size-frequency distribution of N∝D−2 for large terrestrial impact structures...

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