Immediately following this event, a "coal gap" is observed, corresponding to a large negative anomaly in "delta 13-C".
Immediately following this event, a "coal gap" is observed, corresponding to a large negative anomaly in "delta 13-C". Acid rain with pH as low as 2, generated by sulfur aerosols, may have played a role in this event. A stratum rich in fossil fungi characterizes this event, which may have been the result of severe anoxia in Panthalassa. The "Murder on the Orient Express" hypothesis refers to the many probable causes of this event. It is speculated that the cause of the Wilkes Land mass concentration triggered a million years of volcanism during this event; that volcanism occurred at the Siberian Traps. This event marked the end of the trilobites, and defines the end of the Paleozoic. For 10 points, name this most severe extinction event of all time, which marks the beginning of the Triassic.
Immediately following this event, a "coal gap" is observed, corresponding to a large negative anomaly in "delta 13-C".
Permian-Triassic extinction event [or P-Tr event; prompt on "Great Dying"; prompt on answers that mention the "Siberian traps"]