The mysterious Hiawatha crater in Greenland is 58 million years old
The impact that carved the crater is too old to have caused the Younger Dryas cold snap
![pebbles in the foreground with Greenland's ice sheet in the background](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2022/03/030922_cc_greenland_feat.jpg?fit=1030%2C580&ssl=1)
Pebbles at the edge of Greenland’s ice sheet, shown here in 2019, contain zircon crystals that were altered by an impact about 58 million years ago.
Pierre Beck