The Cretaceous ([pronkrᵻˈteɪʃəs],) is a geologic period and system that spans 79 million years from the end of the Jurassic Period million years ago (Mya) to the beginning of the Paleogene Period Mya. 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 Cretaceous - Paleogene (K - Pg) extinction event, also known as the Cretaceous - Tertiary (K - T) extinction, was a mass extinction of some three-quarters of the plant and animal species on Earth that occurred over a geologically short period of time approximately 65 million years ago. 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 is a Paleogene extinction activity.
The Cretaceous ([pronkrᵻˈteɪʃəs],) is a geologic period and system that spans 79 million years from the end of the Jurassic Period million years ago (Mya) to the beginning of the Paleogene Period Mya. 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 Cretaceous - Paleogene (K - Pg) extinction event, also known as the Cretaceous - Tertiary (K - T) extinction, was a mass extinction of some three-quarters of the plant and animal species on Earth that occurred over a geologically short period of time approximately 65 million years ago. 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 is a Paleogene extinction activity.
The Cretaceous ([pronkrᵻˈteɪʃəs],) is a geologic period and system that spans 79 million years from the end of the Jurassic Period million years ago (Mya) to the beginning of the Paleogene Period Mya. 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 Cretaceous - Paleogene (K - Pg) extinction event, also known as the Cretaceous - Tertiary (K - T) extinction, was a mass extinction of some three-quarters of the plant and animal species on Earth that occurred over a geologically short period of time approximately 65 million years ago. 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 is a Paleogene extinction activity.
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