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Re: Age of the Barun Goyot, Djadok(ht)a and Nemegt Formations




--- David Marjanovic <david.marjanovic@gmx.at> wrote:

> > AFAIK there was never any doubt that S.
> > angustirostris and S. osborni belong in the
> > same genus;
> 
> This is not a matter of doubt. This is a matter of
> belief. Genera are 
> _purely_ subjective affairs.

 OK but AFAIK no researcher ever considered them
different genera, which is understandable if they're
"virtually indistinguishable" as Norman wrote.  Btw I
note Williamson, Lehman and others long considered the
Naashoibito, McRae etc coeval with the Lance/Hell
Creek based on just Essonodon, Torosaurus and T. rex
even though the latter two are represented by very
fragmentary remains in the southern units. The latter
were generally assumed to be Lancian equivalents even
though Sullivan considered the T. rex etc fragments to
be misidentified.



                
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