Darwin-L Message Log 1:154 (September 1993)

Academic Discussion on the History and Theory of the Historical Sciences

This is one message from the Archives of Darwin-L (1993–1997), a professional discussion group on the history and theory of the historical sciences.

Note: Additional publications on evolution and the historical sciences by the Darwin-L list owner are available on SSRN.

<1:154>From jlipps@ucmp1.Berkeley.EDU  Thu Sep 16 17:34:46 1993

Date: Thu, 16 Sep 93 15:37:38 PDT
From: jlipps@ucmp1.Berkeley.EDU (Jere Lipps)
To: darwin-l@ukanaix.cc.ukans.edu
Subject: Re: Nemesis

My view is that the geochemical, mineralogical, and perhaps even field
geological evidence is compelling that there was an impact(s) at the
K/T boundary.  It was not the killing mechanism, however, because no
scenario proposed by anyone takes into account the selectivity, paleo-
biogeographic patterns, etc. of the surviving biotas.  I think it
possible that such an impact could result in readjustments in oceanographic
and atmospheric circulation patterns that can explain all of the above.

There are now probably thousands of papers dealing with all of this.

Jere H. Lipps
Museum of Paleontology
UC Berekeley

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