Sharks that hunted near Antarctica millions of years ago recorded Earth's climate history in their teeth

By Sora Kim, Assistant Professor of Paleoecology, University of California, Merced

Tens of million years ago, sand tiger sharks hunted in the waters off the Antarctic Peninsula, gliding over a thriving marine ecosystem on the seafloor below.

All that remains of them today is their sharp pointed teeth, but those teeth tell a story.

They’re helping solve the mystery of why the Earth, some 50 million years ago, began shifting from a “greenhouse” climate that was warmer than…

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