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Re: K-T Extinctions
On Fri, 3 Mar 1995, Janice Dependahl wrote:
> Does anyone know the outcome of the following K-T extinction study:
> Back in 1992, I read about the opposing works of Jan Smit, Free
> University, Amsterdam, and Gerta Keller, Princeton. Both were
> studying rocks from the El Kef Formation in Tunisia. Their findings
> were diametrically opposed. In April, 1992, they were scheduled to
> meet in Tunisia to collect samples of the El Kef Formation and then
> swap the rocks to conduct "blind" analyses.
> My question is does anyone know the outcome of this study? Or can
> anyone give me a reference for the results? I've wondered for almost
> 3 years what came out of this showdown.
> Thanks in advance! :-)
> Jan Dependahl
> Dept. of Earth Sciences
> Santa Barbara City College
A concise summary was written by Steve D'Hondt in
Palaios v. 9, p. 221-223. He discussed the Snowbird III Conference
where the results of the "blind analysis" were hashed over. Steve is a
student of Gerta.
Also specifics of the results of the "blind" test were discussed by Dick
Kerr in Science v. 263, p. 1371-1372.
The results strongly point to a very abrupt extinction at the impact
horizon. This of course is my reading of the event, Gerta and friends
will certainly disagree. I believe the two articles present a