Science
Sharks were nearly wiped out by an unknown extinction event 19 million years ago – CNET
Something happened to ancient shark populations… but scientists aren’t sure exactly what.
A previously unknown extinction event caused shark populations to collapse 19 million years ago.
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When Earth’s temperatures spiked and oxygen levels in the ocean plummeted some 252 million years ago, most life on the planet was doomed. Some estimates suggest the extinction event, a mass extinction known as the Great Dying, killed off up to 70% of all land species but marine animals felt the impact even greater. As much as 96% of all species in the world’s oceans perished.
But not sharks. The…
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