Permian extinctions begin. These extinction events constitute the biggest die-off in the history of the planet, and it was at this time that life itself was almost completely eradicated. It could have happened so easily, and for life to start again is not a certainty, since the conditions that sparked it’s initiation had evaporated, and the planet was more inhospitable to life starting from simple minerals and elements.
Mark well the Permian Extinctions. They far outdid the KT Extinction events.