BIO 112 Lecture Notes - Lecture 6: Methane Clathrate, Siberian Traps, Runaway Greenhouse Effect
Document Summary
From wikipedia: http://en. wikipedia. org/wiki/permian triassic_extinction_event, a little more background. vertebrate species becoming extinct. geologic periods, as well as the paleozoic and mesozoic eras. It is the earth"s species[5][6] and 70% of. The permian triassic (p tr) extinction event, colloquially known as the great dying,[2] [3] occurred about 252 ma (million years) ago,[4] forming the boundary between the permian and triassic most severe known extinction event, with up to 96% of all marine terrestrial. There are several proposed mechanisms for the extinctions; the earlier phase was probably due to gradual environmental change, while the latter phase has been argued to be due to a catastrophic event. Suggested mechanisms for the latter include one or more large bolide impact events, massive volcanism, coal or gas fires and explosions from the siberian traps, So the big hypotheses are that volcanism, methane producing bacteria, and/or a meteor strike all contributed to changes in temperature and oxygen levels resulting in the largest extinction in earth"s history.
