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Re: Tyrannosaur Evolution

Btw, Tsintaosaurus may be dominant at Laiyang.

I thought only one or two specimens were known?

If it is a parasaurolophine, the apparently Djadokhtan or
Campanian beds there may have a faunal composition
quite similar to Jiayin. I think that is consistent
with a preNemegtian age for the latter. Jiayin may be
younger than Laiyang but not by very much-maybe
basal/early Maastrichtian.

To me this looks like a pyramid of weakly supported hypotheses.