An alien Trojan horse............sent by a very advanced society.........

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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 66 million years ago.

Cretaceous–Paleogene extinction event - Wikipedia

https://en.wikipedia.org/wiki/Cretaceous–Paleogene_extinction_event

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Cretaceous–Paleogene extinction event - Wikipedia

https://en.wikipedia.org/wiki/Cretaceous–Paleogene_extinction_event

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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 66 million years ago.

‎Deccan Traps · ‎Cretaceous–Paleogene · ‎Mosasaur · ‎Ammonoidea

Cretaceous - Wikipedia

https://en.wikipedia.org/wiki/Cretaceous

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Cretaceous. The Cretaceous ( /krɪˈteɪʃəs/, kri-TAY-shəs) is a geologic period and system that spans 79 million years from the end of the Jurassic Period 145 million years ago (mya) to the beginning of the Paleogene Period 66 mya. It is the last period of the Mesozoic Era.