The mysterious Hiawatha crater in Greenland is 58 million years old

The powerful impact that created a mysterious crater at the northwestern edge of Greenland’s ice sheet happened about 58 million years ago, researchers report March 9 in Science Advances.

That timing, confirmed by two separate dating methods, means that the asteroid or comet or meteorite that carved the depression struck long before the Younger Dryas cold snap about 13,000 years ago. Some researchers have suggested the cold spell was caused by such an impact.

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