RE: Late Cretaceous Giant Ceratopsians and Hadrosaurs

["Tim Williams" <twilliams_alpha@hotmail.com>]

Tim Donovan <uwrk2@yahoo.com> wrote:

> It is interesting that the bulk of North American late K titanosaur remains 
> are from the Javelina but the only known late K NA titanosaur armor scute 
> is from the underlying Aguja, which suggests the early immigrants were 
> armored saltasaurines but the later Alamosaurus was unarmored.

The late K titanosaurs of N. America are known from very incomplete 
specimens.  The absence of scutes could be taphonomic.  In general, most 
sauropod skeletons do not include skulls, but we know they had heads.




Tim

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