Dinosaurs Connections

Aftermath of Extinction

How did the end of the Cretaceous period rank among Earth’s extinctions?

The mass extinction at the end of the Cretaceous period was the second largest in geologic history; around 76 percent of all species disappeared. The largest mass extinction was at the end of the Permian period, about 250 million years ago, in which about 90 to 97 percent of all species disappeared.



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