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Posted by / 28-Sep-2017 11:47

Radiometric dating margin of error

Since dromaeosaurs had only been found in places that used to be part of Laurasia, scientists figured that the beasts evolved into being after Pangea split.

"This is a whole new ball game," Steve Holen, co-director of the Center for American Paleolithic Research and the paper's lead author, told CNN.What we call Laurasia eventually became North America, Asia and Europe.The other chunk Gondwana, developed into the continents of the Southern Hemisphere and India.Here's why that's important: About 200 million years ago, Earth had just one giant land mass called Pangea.Toward the end of the Jurassic period, it split in two.

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Odds being against such striking parallel evolution, paleontologists speculate that dromaeosaurs more likely originated more than 180 million years ago, before Pangaea broke apart.

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