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Re: Meteroic Evidence For Permian-Triassic Extinction

"Richard W. Travsky" wrote:
> http://www.globeandmail.com/servlet/story/RTGAM.20031120.wmete1120/BNStory/International/
> Washington  A massive asteroid may have collided with the Earth 251
> million years ago and killed 90 per cent of all life, an extinction even
> more severe than the meteorite impact that snuffed out the dinosaurs 66
> million years ago...

There's a 120km wide buried multi-ring structure in the Carnarvon Basin,
Western Australia, that has been dated to either the Late Triassic or
the Permian/Triassic boundary. To quote:

A regional thermal event identified by apatite fission track at
280?250 Ma hints at a possible Permian?Triassic boundary age for 
the impact, although the lack of Triassic fossils in the crater 
fill favours a late Triassic age.



Dann Pigdon                   Australian Dinosaurs:
GIS / Archaeologist         http://www.geocities.com/dannsdinosaurs
Melbourne, Australia        http://www.alphalink.com.au/~dannj/