Dear Friends, Two recent papers, which are coauthored by Dr. Greg J. Retallack and discuss the Permian mass extinction, have been recently published.
They are: Retallack, G.J. and Krull, E.S. 2006. Carbon isotopic evidence for terminal-Permian methane outbursts and their role in extinctions of animals, plants, coral reefs and peat swamps. In Greb, S. and DiMichele, W.A., Editors, Wetlands through time. Special Paper of the Geological Society of America. vol 399, p 249-268. The 3 MB version of the above paper can be downloaded from: http://www.uoregon.edu/~gregr/Papers/Ragnarok2.pdf This paper provides a very detailed discussion of what he and his coauthors argued caused the Permian mass extinction. Also, there is: Retallack, G.J., Greaver, T., Jahren, A.H., Smith, R.M.H., Sheldon, N.D., and Metzger, C.A., 2006, Middle-Late Permian mass extinction on land. Geological Society of America Bulletin. vol. 118, p. 13981411. The 1.5 MB version of the above paper can be downloaded from: http://www.uoregon.edu/~gregr/Papers/Mid-Late%20Permian%20extinction.pdf The above Geological Society of America Bulletin paper is interesting because, they recognize two distinct and separate geologically abrupt mass extinctions on land. One of these occurs at the end of the Middle Permian (Guadalupian) at 260.4 Ma and a later one occurring with the Permian Period at 251 Ma. Both of these correspond to previously recognized marine mass extinctions. He is quite skeptical of the Permian mass extinctions as having been related to any asteroid or comet impact. Other papers coauthored by Greg J. Retallack, which are related to the Permian extinction can be found at: http://www.uoregon.edu/~gregr/publications.html They include: Retallack, G.J., Jahren, A.H., Sheldon, N.D., Chakrabarti, R., Metzger, C.A., and Smith, R.M.H., 2005. Permian-Triassic boundary in Antarctica. Antarctic Science 17, 241-258. The PDF file for this paper can be found at: http://www.uoregon.edu/~gregr/Papers/PTAntarctica.pdf Yours, Paul ____________________________________________________________________________________ Yahoo! Music Unlimited Access over 1 million songs. http://music.yahoo.com/unlimited ______________________________________________ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
