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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,

I'd be very surprised if the "Huhteeg" Svita was anything else than "Khukhtek"ian.