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Re: Tyrannosaur Evolution and The timing of stegosaur extinction
Tim Donovan wrote:
> >Note that Saurolophus, an American immigrant,
> And we know this... how?
P. maximus is a possible ancestor of Saurolophus.
Are possible ancestors known from the Campanian of
The comparison is a tad unfair. We know a lot more about the hadrosaur
fossil record in the Late Cretaceous of North America than we do about Asian
hadrosaurs living around the same time.