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Re: The timing of stegosaur extinction
> > Lucas and Estep (1998) say "key taxa of
> biochronological value" for
> > Tsagantsabian age are Prodeinodon, Asiatosaurus,
> Psittacosaurus and
> > Dsungaripterus. But both Prodeinodon and
> Asiatosaurus are currently
> > indeterminate, so no remains besides the Huhteeg
> Svita holotypes can be
> > referred to them. Psittacosaurus is said to also
> be in the younger
> > Khukhtekian sediments,
Dsungaripterus is also known from the Wuerhosaurus
bearing upper Tugulu group. Those beds are considered
the equivalent of Tsagantsabian beds in Mongolia based
on fossils. K-Ar dating etc indicates a
Berriasian-Valanginian age for the Mongolian beds.
Some of the Tsagantsabian taxa may have survived into
the late early Cretaceous but not stegosaurs,
IIRC K. Carpenter mentioned a new, Aptian age for the
Yellow Cat onlist.
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