最終更新日：2024/08/03
The K-Pg boundary marks the transition between the Cretaceous and Paleogene periods.
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The K-Pg boundary marks the transition between the Cretaceous and Paleogene periods.
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The K-Pg boundary marks the transition between the Cretaceous and Paleogene periods.
The K-Pg boundary marks the transition between the Cretaceous and Paleogene periods.
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