English vocabulary

Permian extinction, also called Permian-Triassic extinction , is a series of extinction pulses that contributed to the greatest mass extinction in Earth’s history.

The Permian extinction was characterized by the elimination of over 95 percent of marine and 70 percent of terrestrial species.

This event ranks first in severity of the five major extinction episodes that span geologic time.

The diversity of marine animal families since late Precambrian time. The data for the curve comprise only those families that are reliably preserved in the fossil record; the 1,900 value for living families also includes those families rarely preserved as fossils.  The several pronounced dips in the curve correspond to major mass-extinction events. The most catastrophic extinction took place at the end of the Permian Period.

To learn more : https://www.britannica.com/science/Permian-extinction