RE: Extinction

[Nathan Myhrvold <nathanm@MICROSOFT.com>]

I believe that there is trackway evidence even closer that 1 meter to the KT
boundary.

Nathan

-----Original Message-----
From: Dinogeorge@aol.com [mailto:Dinogeorge@aol.com]
Sent: Thursday, March 23, 2000 11:29 PM
To: philidor11@snet.net
Cc: dinosaur@usc.edu
Subject: Re: Extinction


In a message dated 3/24/00 0:34:28 AM EST, philidor11@snet.net writes:

<< Please remember that no dinosaur fossils have been found close to the K/T
 boundary.  A mathematical analysis has demonstrated that there might still
 have been dinos extant to go extinct at impact, but the same analysis
 demonstrates equally that some remnants might have survived for some time
 afterwards. >>

Intensive dinosaur-bone surveys have closed the margin between the K-T 
boundary and the highest-known non-reworked dinosaur fossils to a mere meter

or so below the boundary clay, so I'm not at all clear on what you mean by 
"close." One possible reason this gap hasn't closed even further is that so 
far there are no known dinosaur-bearing strata anywhere in the world that 
extend right up to the boundary clay layer. Dinosaur-bearing strata with a 
profusion of dinosaur fossils are quite uncommon, and we're lucky to have 
what we have.