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Re: Asteroid Impact Ended The Triassic



Ah, yes. But the account at
http://space.com/scienceastronomy/planetearth/jersey_dinosaurs_020516-1.html
is headed with a painting by my good friend Joe Tucciarone, the original of
which I've seen and breathed upon many times (and, no, it does not [yet]
hang on my wall, mores's the pity).

-= Tuck =-

----- Original Message -----
From: "Richard W Travsky" <rtravsky@uwyo.edu>
To: <dinosaur@usc.edu>
Sent: Thursday, May 16, 2002 6:19 PM
Subject: Asteroid Impact Ended The Triassic


>
>
http://story.news.yahoo.com/news?tmpl=story&u=/nm/20020516/sc_nm/science_din
osaurs_dc_1&e=1&ncid=585
>
> WASHINGTON (Reuters) - An asteroid may have wiped out the dinosaurs 65
> million years ago, but an earlier one probably allowed the rise of the
> giant creatures, who dominated the planet for 135 million years,
> scientists said on Thursday.
>
> Piecing together evidence from footprints, fossils and a dusting of a rare
> metal found in asteroids, the experts said they had concluded that a huge
> impact wiped out most of the plants and crocodilian creatures that ruled
> the world during the Triassic era.
> ...
> "Our research adds to the speculation that there was a comet or asteroid
> impact about 200 million years ago, followed relatively quickly by the
> rising dominance of dinosaur populations of the Jurassic period," said
> Dennis Kent, a geology professor at Rutgers University in New Jersey.
> ...
> Looking at footprints and fossilized bones from nearly 80 different sites,
> Olsen's team concluded that it only took about 50,000 years for dinosaurs
> to start growing big -- really big.
> ...
> The team used a high-resolution mass spectrometer at the lab of Christian
> Koeberl of the University of Vienna in Austria to find iridium traces from
> geologic layers dating back 200 million years, to the boundary between the
> Triassic (248 to 208 million years ago) and the Jurassic (208 to 146
> million years ago).
>
> Still to be found is what would be a vast crater, said Olsen, although
> there are candidates in Canada and Australia. "We don't actually have an
> impact structure yet," he said -- but pointed out it took 15 years to find
> the 65 million-year-old crater in the Yucatan.
>