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The Biggest Dinosaurs

I checked the archives and found some messages about size extremes in 
dinosaurs, but none that address my question....which is, does anyone 
have any thoughts about why dinosaurs in Patagonia were growing so large 
during the Cretaceous, while it seems that the trend was the opposite 
elsewhere in the world?  I just read a popular article called "Land of 
the Giants" by Don Lessem (Aug. 95) and am very interested in learning 
more about this.  Thank you very much.

Christy Nadalin