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Re: Theropod "migrations"
In a message dated 99-04-24 17:55:21 EDT, Dinogeorge wrote:
There is one known ceratopid in central Asia, Turanoceratops, described by
Nessov & Kazynshkina in 1989, with new material described by Nessov in 1995.
It looked something like Montanoceratops from the US. But other than that,
ceratopids don't seem to have gained a foothold in Asia the way they did in
North America. Most of the ceratopids evolved post-Bering-land-bridge in
North America, whereas there is a diverse assemblage of protoceratopids in
Asia. Luck of the draw? >>
I think I mentioned this a while back, but it seems to me that it would be
hard to design an animal more suited for drowning than the large ceratopids
with their huge, downward-pointing skulls and semi-fused necks. This makes me
wonder if the Bering connection wasn't more of a sweepstakes route
(island-hopping) at least during the Campanian-Maastrichtian.
A study of bonebeds would be interesting in this connection also. Two
differing causes are volcanic ashfalls and flooding ( and perhaps a
combination of the two). It would be interesting to see statistics visa-vi
hadrosaur and ceratopian bonebeds in this context. Has anyone done a study of
the of dinosaur bonebeds? Are there any strictly fluvial hadrosaur bonebeds?
Anyone need an idea for their M.S.? Dan Varner.