Cretaceous. The Cretaceous ended with a large mass extinction, the Cretaceous - Paleogene extinction event, in which many groups, including non-avian dinosaurs, pterosaurs and large marine reptiles died out. The end of the Cretaceous is defined by the abrupt Cretaceous - Paleogene boundary (K - Pg boundary), a geologic signature associated with the mass extinction which lies between the Mesozoic and Cenozoic eras. The Paleogene ([pronˈpæliːədʒiːn] or [ˈpeɪliːədʒiːn] also spelled Palaeogene or Palæogene; informally Lower Tertiary) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago (Mya) to the beginning of the Neogene Period Mya. The Paleogene is most notable for being the time during which mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of the Cretaceous - Paleogene extinction event that ended the preceding Cretaceous Period.
The Cretaceous ended.
Cretaceous. The Cretaceous ended with a large mass extinction, the Cretaceous - Paleogene extinction event, in which many groups, including non-avian dinosaurs, pterosaurs and large marine reptiles died out. The end of the Cretaceous is defined by the abrupt Cretaceous - Paleogene boundary (K - Pg boundary), a geologic signature associated with the mass extinction which lies between the Mesozoic and Cenozoic eras. The Paleogene ([pronˈpæliːədʒiːn] or [ˈpeɪliːədʒiːn] also spelled Palaeogene or Palæogene; informally Lower Tertiary) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago (Mya) to the beginning of the Neogene Period Mya. The Paleogene is most notable for being the time during which mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of the Cretaceous - Paleogene extinction event that ended the preceding Cretaceous Period.

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The Cretaceous ended.
Cretaceous. The Cretaceous ended with a large mass extinction, the Cretaceous - Paleogene extinction event, in which many groups, including non-avian dinosaurs, pterosaurs and large marine reptiles died out. The end of the Cretaceous is defined by the abrupt Cretaceous - Paleogene boundary (K - Pg boundary), a geologic signature associated with the mass extinction which lies between the Mesozoic and Cenozoic eras. The Paleogene ([pronˈpæliːədʒiːn] or [ˈpeɪliːədʒiːn] also spelled Palaeogene or Palæogene; informally Lower Tertiary) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago (Mya) to the beginning of the Neogene Period Mya. The Paleogene is most notable for being the time during which mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of the Cretaceous - Paleogene extinction event that ended the preceding Cretaceous Period.

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The Cretaceous ended.
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