Which of the five major mass extinctions is known as 'The Great Dying'?

Answer

The Permian-Triassic extinction

The Permian-Triassic extinction is frequently dubbed 'The Great Dying' and is noted as the most severe event, potentially eliminating 90% of marine species.

Which of the five major mass extinctions is known as 'The Great Dying'?
biologyextinctionGeologycause