How Many Mass Extinctions Have There Been?

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Paleontologist excavating fossils in Colorado's Dry Mesa Quarry

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This video clip is about mass extinctions. In the late 1970s, a scientist by the name of Jack Sepkoski embarked on the most ambitious fossil hunt ever. He created a chart that shows what is today called "The Big Five Mass Extinctions." The chart is still used today by paleontologists, but is looked at with many different views and theories.

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