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Re: Aussie ceratopians
Mark Summer writes:
> If they reported accurately, Protoceratops was in Australia tens of
> millions of years before previously believed. I find it hard to
> believe that this genus, part of a family which shows such explosive
> diversity over a short span, should be stable for longer than the
> space between Protoceratops and Triceratops.
Nope, can't agree with you on this one. Anatomically _Leptoceratops_
is the most primitive known protoceratopsid ("_Archaeoceratops_"
permitting), but geologically it is among the youngest known
ceratopsians. This genus must have remained stable for several
million years at least.
A _Protoceratops_ from South Australia? I know of a _Leptoceratops_-
like ulna from Victoria, of late Early Cretaceous age. (A bit of
political geography may not go astray: the State of Victoria is
in _southern_ Australia, to the east of the State of South Autralia.)