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Re: Meteroic Evidence For Permian-Triassic Extinction

I believe the canonical 90-95% figure comes from the work of David Raup and Jack Sepkoski on marine invertebrates, which are extremely well-represented in the fossil record. That data must be about 15 years old, and has been quoted so often it's become part of the folk wisdom.

I don't know what other analyses have been done more recently, or if anyone has attempted to average the effects over all species at the time. It's quite possible that marine invertebrates suffered disproportionately from the marine anoxia and sea-level change at the time. -- Jeff Hecht

At 2:15 PM +1100 11/22/03, Phil Hore wrote:
I'm boning up (exscuse the pun) on the start of the Triassic for a peice I'm writting and what I find odd is I'm finding no 'extinction of 95%' of all life happening. There is certainly a lot going on and many species are disapearing, but 95% just doesn't seem to be the figure I'm seeing...maybe more 65-70 %...to be fair I've only just started my research so I have a lot more to look through. I just find it odd and am thinking that if there was an impact at the end of the permian, it was a lot more localised then the global killer of the KT impact.

Phil Hore

National Dinosaur Museum

Canberra, Australia

ph (02) 62302655

-- Jeff Hecht, science & technology writer jeff@jeffhecht.com; http://www.jeffhecht.com Boston Correspondent: New Scientist magazine Contributing Editor: Laser Focus World 525 Auburn St., Auburndale, MA 02466 USA v. 617-965-3834; fax 617-332-4760