[Taxacom] Hedges /Kumar (eds) The Timetree of Life

[John Grehan]

-----Original Message-----
From: taxacom-bounces at mailman.nhm.ku.edu
[mailto:taxacom-bounces at mailman.nhm.ku.edu] On Behalf Of Jason Mate

In the specific case we are discussing, considering the oldest known
fossil for the ingroup (37myr) and for rodents in general (KT) it seems
reasonable to assume that the maximal age will fall within this range,
therefore outside the opening of the South Atlantic and thus not
supporting a vicariance scenario.

Heads has already responded specifically, but I would just say that the
above is true only if one supposes that it is. If one accepts the
personal authority of Jason then the above assumption is reasonable.
Otherwise it is not.

John Grehan


Best

Jason
 		 	   		  
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