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

--- Tim Williams <twilliams_alpha@hotmail.com> wrote:

> The 
> validity of genera often lies in the eye of the
> beholder, and so makes for a 
> poor yardstick in biostratigraphy.

 AFAIK there was never any doubt that S.
angustirostris and S. osborni belong in the same
genus; they may even be the same species. 

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