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The Cretaceous period is known as the period, marked by the extinction of dinosaurs. This was almost certainly the result of a meteorite impact. Also ammonites became extinct while they had their heyday during the Cretaceous. Mammals on the other hand, began to develop strongly. The rise of angiosperms and development of flowering plants also started during the Cretaceous.
The Cretaceous situated on the geological timescale
See also the article on the Geological timescale.
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