Re: Rapetosaurus stuff

["Rob Gay" <rob_redwing@hotmail.com>]

> Perhaps the migration route used by Alamosaurus leaving Asia was more 
> upland, and thus we don't have a record of them in Canada or Northern US 
> because they lived in habitats that did not cater well to fossils being 
> left behind.  IIRC, I seem to remember reading of a group of lizards that 
> also lived in the southwest at that time that had more in common with 
> lizards from Central Asia than the rest of North America.  I suspect the 
> only reason we don't have sauropods in Canada, ect. is because of 
> enviromental and habitat differences.<
The North Horn Formation here in Utah is thought to be large, vegitated 
floodplains during the late K. I believe (though I am no expert on northern 
latest K environs) that it would be somewhat similar, environmentally 
(vegitated flood plain with big rivers) to the Hell Creek. So, the question 
would then be "Why did titanosaurs, if they were coming from Asia, avoid 
vegitated floodplains in the northern part of NA, but settle in vegitated 
floodplains in southern NA?" To me, that wouldn't make much sense for the 
animals to do that. Personally, the idea of NA titanosaurs coming from Asia 
would make more sense if we had any evidence of any titanosaurs north of 
Utah.
Peace,
Rob

Student of Geology
Northern Arizona University
Biological Science Tech
Manti-La Sal National Forest
AIM: TarryAGoat
http://www.geocities.com/elvisimposter/dinopics.html
http://www.cafepress.com/RobsDinos
"A _Coelophysis_ with feathers?"

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