Also known as the Carnian Pluvial Event . It started when the temperature rose about 3 degrees due to volcanic eruptions, and the whole climate of the world reversed from desert to swamp. I am amused by the global climate congruency because it's a feature often mocked in pulp science fiction, with one-weather planets. But that actually can happen. It makes me laugh at the 40-day flood. I think the next time some Christian annoys me with that reference, I'll say "Try 2 million years" just to watch smoke come out their ears.