Ice age at the Permian-Triassic boundary

The mass extinction at the Permian-Triassic boundary is linked to a period of glaciation! The article of Baresel et al. in Scientific Reports calls into question the theories that the big mass extinctions are related to a global temperature increase. It suggests that the injection of H2S and SO2 during the initial activity of the Siberian Traps has produced a drop in global temperature and a marine regression.