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Something Wiped Out Nearly All Sharks 19 Million Years Ago, New Research Suggests Share A careful arrangement of shark scales, or dermal denticles. (Image: Leah Rubin) Scientists have stumbled upon a previously unknown extinction event that decimated ocean shark populations 19 million years ago. The cause of this sudden die-off, in which global shark populations plummeted by 90%, is a complete mystery. The previously unidentified extinction event, as described in a Science paper published today, was discovered by accident. Elizabeth Sibert, the first author of the study and a postdoctoral fellow from the Yale Institute for Biospheric Sciences at Yale University, detected evidence of the extinction event while studying fossilized fish teeth and shark scales. Sibert was seeking to learn more about these mysterious bits and pieces, collectively known as ichthyoliths, so she, along with co-author Leah Rubin, a student at the College of the Atlantic at the time of the research, embark

New yorkUnited statesNicholas pyensonElizabeth sibertLeah rubinInternational ocean discovery programNational museum of natural historyHarvard universityOcean drilling programSmithsonian institutionCollege of the atlanticUniversity of zurichYale instituteBiospheric sciencesYale universityState university