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RE: Sauropod Self Defense

yes, if you consider Late K as a single
unit...hmmm...but along those 35 m.y. many faunas
changed. I didn't consider Megaraptor because is from
the Portezuelo Fm, which is around Turonian, i.e.,
older than the Turonian-Coniacian boundary that I've
told you, when basal tetanurans - abelisauroid
balances changed.
I see Late K as four main stages in Neuquen basin:
Limayan(Cenom), Neuquenian(Tur-Con), Coloradoan(Sant
to E.Camp) and Allenian(L.Camp to Maast), with their
characteristical faunas. 
--- Tim Williams <twilliams_alpha@hotmail.com>

> Ezequiel Vera wrote:
> > I'm not sure, but if I'm right,
> Carcharodontosaurids and Spinosaurids where
> > replaced by Abelisaurids as "big predators"
> (althought not so big) in South
> > America during the late cretaceous...
> _Megaraptor_, which is probably either a
> spinosauroid or a carcharodontosaurid, is of Late
> Cretaceous age.  So the abelisaurids didn't have
> South America to themselves.
> Cheers
> Tim
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Lic. Sebastián Apesteguía

Área de Paleontología. Fundación de Historia Natural 'Félix de Azara',
Dto. de Ciencias Naturales y Antropología, CEBBAD, Univ.Maimónides, 
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Sección de Paleontología de Vertebrados 
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