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Re: primers, and South American dinosaurs

On Thu, 2 Dec 2004, Christopher Taylor wrote:

> 'In this contribution is presented the preliminary results of a
> paleontological expedition to five Upper Cretaceous fossil sites in the
> western part of the state of São Paulo, Brazil.

There was an SVP presentation about Romanian dinosaurs whose disappearance
had previously been believed to indicate the extinction event.  Now it
appears they disappeared earlier due to other causes.  Does anyone know
how reliably all the SA Upper Cretaceous fossils are dated?