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Cretaceous-Tertiary extinction event

The Cretaceous-Tertiary extinction event was a period of massive extinction of species, about 65.5 million years ago.

It corresponds to the end of the Cretaceous Period and the beginning of the Tertiary Period.

Note:   The above text is excerpted from the Wikipedia article "Cretaceous-Tertiary extinction event", which has been released under the GNU Free Documentation License.
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