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Jurassic

The Jurassic period is a major unit of the geologic timescale that extends from about 200 Ma (million years ago) at the end of the Triassic to 146 Ma at the beginning of the Cretaceous.

The Jurassic constitutes the middle period of the Mesozoic era, also known as the Age of Dinosaurs.

Note:   The above text is excerpted from the Wikipedia article "Jurassic", which has been released under the GNU Free Documentation License.
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