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Cretaceous
The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period, about 146 million years ago (Ma), to the beginning of the Paleocene epoch of the Tertiary period (65.5 Ma).
Note: The above text is excerpted from the Wikipedia article "Cretaceous", which has been released under the GNU Free Documentation License.
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