Re: late night thoughts: adults only

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

----- Original Message ----- 
From: "don ohmes" <d_ohmes@yahoo.com>
Subject: Re: late night thoughts: adults only


> Still, I had thought that the overlap between T. rex and sauropods in N. 
> America was minimal and early, not zero.

Indeed it wasn't zero. "*Alamosaurus*" persisted all the way to The End, 
just as *T.* did.

> Not that my assessment of the physical vulnerability of sauropods is 
> affected, or my perception of the stealth-through-immobility 
> options/capabilities of T.rex and functional equivalents (notably 
> including allosaurids).

In that case the sauropods should have died out in the Late Jurassic at the 
latest...

> Nor was I aware that the difference in last appearance times of sauropods 
> in Asia/North America was so dramatic and clearcut.

It isn't. I talked about the North American "sauropod gap" (which may be an 
artifact of preservation). In North America, there's "*Alamosaurus*" from 
the late Campanian all the way to the end of the Maastrichtian; in Asia 
there are sauropods all the way to the Djadokhta Formation, which is usually 
considered early Maastrichtian in age -- there is no late Maastrichtian in 
northern and central Asia.