> > 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.