Permian-Triassic Extinction (PBS)
http://www.pbs.org/wgbh/evolution/library/03/2/l_032_02.html

PBS


This PBS website provides a very brief description of the Permian-Triassic extinction, as well as some inferences for the causes of the event. Video footage on the page shows the rock record in the field with a specialist in the P-T boundary.


Subject: Geoscience:Paleontology:Extinction and Diversity