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Around the end of the Cretaceous Period.
Dinosaurs became extinct at the end of the Mesozoic Era 65 million years ago. Their extinction also marked the beginning of the Cenozoic Era.

Dinosaurs disappeared near the end of the cretaceous period.


Most people believe it was at the end of the Cretaceous however the truth is that it ended in the Tertiary PERIOD not era so be careful that was why the event was called the K-T event because c had been taken in a mass extinction in the oceans.
All non avian dinosaurs lived in the Mesozoic Era (251 - 65Ma). The mass extinction 65 million years ago of all non avian dinosaurs along with many other types of animals and plants marks the boundary between the Mesozoic and the Cenozoic Eras.
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6y ago
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13y ago

I'm not sure what exact period, but their extinction was called the Cretaceous-Tertiary Extinction, probably because it marked the split between the Cretaceous period and the Tertiary period.

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Q: What period did the dinosaurs become extinct?
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What period did dinosaurs become extinct?

around 6.5 billion years ago


Why did the Rhamphorhynchus become extinct?

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Did dinosaurs become extinct AD or BC?

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What is no longer here and is a species that has died out and has become extinct?

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