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Re: Tyrannosaur Evolution and Bagarataan

 AFAIK, saurolophines are unknown from the apparently
Djadokhtan equivalent beds at Laiyang.

How many dinosaurs in total have been found there so far? Does that number give us a reason to think that we'd already have discovered saurolophines if any were present?

It is likely IMO that the sauroloph niche was already
occupied in Asia by Keberosaurus to almost mid
Maastrichtian, and the Tsagayan types were then
supplanted by American immigrants.

What do you suggest that that niche was?