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CNN article about dinosaur extinction

CNN article about paleontologist's theory on what killed the dinosaurs

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<excerpt from article>
"In addition to the extinction at the close of the Cretaceous, other
``big killers'' took place at the end of the periods known as the
Permian (245 million years  ago), Devonian (360 million years ago),
Ordovician (438 million years ago) and  the Cambrian (510 million years

Ginsburg believes that a common element probably tied all of these
events together -- sea movement caused either by changes to the polar
icecaps or shifts of the Earth's crust."