paleonet PDF PAPER AVAILABLE

[jean guex <Jean.Guex@xxxxxxx>]

>>>                    To anyone interested I can send the following paper 
>>> in PDF form:

>>>Buoyancy control and growth rates in ammonoids: new preliminary remarks 
>>>about an old Red Herring.

Abstract
Ammonoid preseptal cavity has been known since a long time and often 
interpreted as a possible tool for buoyancy control by these animals. This 
possiblity was firmly rejected by Jacobs (1996) who considered the 
"cartesian diver" hypothesis as a "red herring". The present paper proposes 
a re-evaluation of this problem. The relationships between the shell 
geometry, septal spacing and growth rate of the ammonoids are also 
discussed herein.

Prof Jean Guex
Institut de Geologie
BFSH-2
1015 Lausanne
Switzerland
tel: 41 21  692 4346
fax: 41 21 692 4305
NEW E-MAIL: jean.guex@unil.ch