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GSA Bulletin; September 2004; v. 116; no. 9-10; p. 1294; DOI: 10.1130/B25504.1
© 2004 Geological Society of America
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Vertebrate extinction across Permian-Triassic boundary in Karoo Basin, South Africa: Discussion

Milo Engoren{dagger},1,2

1 Departments of Anesthesiology and Internal Medicine, St. Vincent Mercy Medical Center, 2213 Cherry Street, Toledo, Ohio 43617, USA
2 Department of Anesthesiology, Ohio University College of Osteopathic Medicine, Athens, Ohio 45701, USA

The Permian-Triassic boundary was a time of lowered atmospheric oxygen and raised carbon dioxide pressure and massive vertebrate extinction. The levels of oxygen (12 vol%) and carbon dioxide (~2000 ppmV) are typically tolerated by modern vertebrates and are not abnormal enough to have contributed significantly to the extinction.






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