See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/242894705 Timing of Permian-Triassic Anoxia Article in Science ยท September 1997 DOI: 10.1126/science.277.5333.1745f CITATIONS 6 READS 15 2 authors, including: Gregory J. Retallack University of Oregon 300 PUBLICATIONS 8,726 CITATIONS SEE PROFILE All content following this page was uploaded by Gregory J. Retallack on 07 August 2015. The user has requested enhancement of the downloaded file.