Using new techniques, scientists have determined the Permian mass-extinction even happened 10x faster than previously thought. They've also go a more precise date as to when it happened, and some of the data is allowing them to make a more definitive tie-in to the Siberian Traps volcanic event. That's always been the #1 suspect, but the dates have never quite squared up yet. I think it's only a matter of time, though, before it all lines up.