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Re: 'Jurassic Park' Unearthed in Argentina's Patagonia - Reuters

I don't quite follow these passages from the article:

 "Jurassic-period fossils are very, very rare. They have only been found
 in China and Madagascar ... so we know very little about the evolution
 of the dinosaurs, (winged) pterosauri, and mammals from this key period." 

 High sea levels during the tropical Jurassic period -- which extended
 from 213-144 million years ago -- meant there was relatively little land
 on which dinosaur remains could remain intact, and not be washed
 away into the oceans, Cladera added. 

Huh? Jurassic period fossils are only known from China and Madagascar?
"Relatively little land"?