Something Mysteriously Eliminated About 90 Percent of Sharks 19 Million Years Ago
Credit: GERARD SOURY/THE IMAGE BANK/GETTY IMAGES Around 19 million years ago, something horrible happened to sharks. Fossils amassed from sediments in the Pacific Ocean reveal a previously unidentified and shocking shark extinction event. During this event, the populations of the predators abruptly dropped by as much as 90 percent, researchers report in the journal Science on June 4....