Sharks Almost Went the Way of the Dinosaurs 19 Million Years Ago

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Researchers found that sharks declined in abundance by roughly 90% about 19 million years ago.

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Smooth and linear denticle types -- those marked with a are extinct.

This abundance makes them valuable to scientists seeking to understand the past, said Paul Harnik, a paleobiologist at Colgate University who was not involved in the research.In 2015, Sibert received a box of mud spanning about 40 million years of history. The reddish clay, extracted from two sediment cores that had been drilled deep into the Pacific Ocean seafloor, contained fish teeth, shark denticles and other marine microfossils.

These declines in relative and absolute shark abundance suggest that something happened to shark populations about 19 million years ago, Sibert concluded.“We wanted to know if the sharks went extinct or if they just became less prominent,” Sibert said.

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