This map is from a recent study (https://scitechdaily.com/when-mega-el-nino-rewrote-earths-fate-the-untold-story-of-the-largest-mass-extinction/).

It makes me suspicious that the northern landmass is shown with very cold surface temperatures when this is the moment of extinction. In Siberia (this is apparently Siberia) at that moment there were eruptions. Shouldn't there be higher temperatures there?