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Subject:       Re: Milankovich Cycles

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----------------------  Original Message Follows  ----------------------

     I agree with Jere.  We go far beyond the fundamental message our 
     fossil evidence presents to us when we try to make these kinds of 
     conclusions.  Leave these conclusions to those who have the 
     appropriate evidence.   
     
     R. Lane  


______________________________ Reply Separator _________________________________
Subject: Re: Milankovich Cycles
Author:  paleonet-owner (paleonet-owner@nhm.ac.uk) at unix,in
Date:    6/30/95 5:03 PM


Tough to infer an asteroid from paleontological data.  I think we should 
get out of that business since the fossil evidence does not say anything 
about an impact.  It can only tell us something about the environmental 
conditions, before and after an extinction event, and perhaps the timing. 
The evidence comes from geochemistry, mineralogy, geologic mapping, and 
such things that would record an impact.   Now that does not mean that we 
don't have much to contribute, for example by defining closely the pre and 
post evironments, we could then ask our physical/chemical colleagues to get 
us from one to another with their scenario, which usually causes them all 
kinds of trouble.  But if we argue about impacts from fossil evidence 
alone, we degrade our own positions because our data do not speak to 
impacts.
     
Jere
     
>If the extinction of dinosaurs, etal, is due to an impact induced imbalance in 
>the late Cretaceous environment, then the events took place during a shorter ti
>me interval than the resolution of stratigraphy. The evidence can only be coinc
>idental. There has to be "reasonable guilt." For some what is reasonable is wha
>t is popular! What would be an "absolute proof?"I don't know!
>                                                         Gil Brenner
     
Jere H. Lipps,  Director
Museum of Paleontology
University of California
Berkeley, California 94720 USA
     
Voice:  510-642-9006.  Fax:  510-642-1822 
Internet:  jlipps@ucmp1.berkeley.edu