News > What Ancient Shark Teeth Say About Earth’s Climate History

What Ancient Shark Teeth Say About Earth’s Climate History

15/07/2021 11:10 PM | Click to read full article

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 today toward cooler “icehouse” conditions.