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Re: The timing of stegosaur extinction
--- Michael Mortimer <email@example.com>
> Tim Donovan wrote-
> > Dsungaripterus is also known from the
> >bearing upper Tugulu group. Those beds are
> >the equivalent of Tsagantsabian beds in Mongolia
> >on fossils.
> So where else is Dsungaripterus known from besides
> the Tugulu Group?
Gurvan Eran, Tevsh, Undurukhin and Tsagantsab
formations of Mongolia. I don't know in which of those
units or what other fossils show equivalence, though
Tugulu turtles "seem little changed from the late
> >K-Ar dating etc indicates a
> >Berriasian-Valanginian age for the Mongolian beds.
> Berriasian-Aptian, according to dates in Shuvalov
> (2000) for the Tsagantsav
> Svita. Not very precise...
See pages 259 and 271. He made it clear that the
Tsagantsav svita is dated at Berriasian-Valanginian on
the basis of K-Ar dating and fossils. Also that
Tsagantsabian deposition began before the end of the
> > IIRC K. Carpenter mentioned a new, Aptian age for
> >Yellow Cat onlist.
> Where? A search for "Carpenter" "Aptian" Yellow
> Cat" came up with no
> relevent posts.
I just relocated it myself and will forward it to
you. I see the Yellow Cat could be either Barremian or
Aptian. If it is Barremian the NA stegosaurs
apparently disappeared before then.
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