Or the Late Permian Siberian Traps when the crust ripped open, erupted for 2 million years, and "are believed to be the primary cause of the Permian–Triassic extinction event, the most severe extinction event in the geologic record": https://en.wikipedia.org/wiki/Siberian_Traps
alt Hacker News
Or the Late Permian Siberian Traps when the crust ripped open, erupted for 2 million years, and "are believed to be the primary cause of the Permian–Triassic extinction event, the most severe extinction event in the geologic record": https://en.wikipedia.org/wiki/Siberian_Traps