Re: last rudists (was: Re: emus)

[David Marjanovic <david.marjanovic@gmx.at>]

It took some time till I got the idea, and then some till my Internet 
connection worked again...

----- Original Message -----
From: "Markus Moser" <dml_moser@web.de>
Sent: Thursday, January 27, 2005 5:12 PM

> ABSTRACT.-The large plagioptychid rudist bivalve Mitrocaprina tschoppi 
> (Palmer) is recorded from the Guinea Corn Formation (Late Maastrichtian) 
> of central Jamaica. ...'
>
> Signor & Lipps at work again? <<
>
> No, Zinsmeister.
> Well, that's what I would call it. I believe it was Zinsmeister (et al.?) 
> in a J. Paleont. paper about 1984/88 who first proposed that the KT mass 
> extinction proceeded during the end-Cretaceous from the paleopolar regions 
> towards the paleoequator. Thus ammonites became extinct in the Antarctic 
> area some million years earlier than in the central Tethys.

How certain is Zinsmeister that the Signor-Lipps effect isn't the 
explanation for his observation of a gradual extinction on Seymour Island?