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Ornithurine diversity

Longrich, N. 2008. An ornithurine-dominated avifauna from the Judith River
Group (Campanian, Upper Cretaceous) of Alberta, Canada. Cretaceous Research.
doi: 10.1016/j.cretres.2008.06.007.
These fossils show that the Ornithurae had diversified considerably by the
end of the Campanian, and that they were the dominant birds in some North
American ecosystems. The diversification of the Ornithurae towards the end
of the Cretaceous could help explain how this clade managed to survive the
end Cretaceous mass extinction.

...and possibly why competition/predation is a better explanation for enantiornithine extinction in some ecosystems?

Congratulations to Nick!