Re: New dinosaur diversity articles

[David Marjanovic <david.marjanovic@gmx.at>]

>   IMO it is very important to determine which unit is
> younger, the Nemegt or the Tsagayan. If Godefroit is
> right and the Tsagayan is younger i.e. late
> Maastrichtian, that would certainly argue against a
> decline in diversity. If the Nemegt is younger, that
> would suggest hadrosaur diversity declined in Asia as
> well as in North America.

Only if Nemegt and Tsagayan represent the same environment. Is this really
the case?

> * Hypacrosaurus may have persisted into Hell Creek
> time but its putative remains are stratigraphically
> low and rare, suggesting that it was on the verge of
> disappearing.

Why are you trying to do statistics with a sample of 1?