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Re: Study Finds that a Single Impact Killed the Dinosaurs



But there is an overall lack of terrestrial fossils in the uppermost
Hell Creek fm. Stuff really thins out ~20 m below the Hell Creek/Fort
Union contact in eastern MT and in many places is almost non existant,
so something other than an impact must have been happening to the
environment. <<<

Or else the geochemistry was changed by the impact itself (e.g. acid rain) resulting in a reduction in the liklihood of preservation as you get closer to the K/T boundary. Not saying it's right, but you have to control for confounding factors before it's positive evidence. How about the percentage of teeth vs. other bones near the boundary? Perhaps differences in the preservation of types of apatite would be a test of whether it was truly faunal reduction or a change in preservational regime.

Scott Hartman
Science Director
Wyoming Dinosaur Center
110 Carter Ranch Rd.
Thermopolis, WY 82443
(800) 455-3466 ext. 230
Cell: (307) 921-8333

www.skeletaldrawing.com

-----Original Message-----
From: lhall@montana.edu
To: koreke77@yahoo.de
Cc: dinosaur@usc.edu
Sent: Wed, 29 Nov 2006 9:11 AM
Subject: Re: Study Finds that a Single Impact Killed the Dinosaurs

But there is an overall lack of terrestrial fossils in the uppermostÂ
Hell Creek fm. Stuff really thins out ~20 m below the Hell Creek/FortÂ
Union contact in eastern MT and in many places is almost non existant,Â
so something other than an impact must have been happening to theÂ
environment.Â
Â
On 11/29/06, evelyn sobielski <koreke77@yahoo.de> wrote:Â
But wasn't the multiple-impact theory as of recentlyÂ
more about the Chixculub bolide breaking up on entryÂ
and thus multiple, but essentially *simultaneous*Â
impacts? Analysis of the bolide's trajectory couldÂ
help.Â
Â
EikeÂ
Â
Â
Â
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