The powerful impact that created a mysterious crater at the northwestern edge of Greenland’s ice sheet happened about 58 million years ago.
Scientists spotted the crater in 2015 during a scan by NASA’s Operation IceBridge, which used airborne radar to measure the ice sheet’s thickness. Those and other data revealed that the crater, dubbed Hiawatha, isThe next step was to determine how old the Hiawatha crater might be.
Pebbles near the Hiawatha impact crater in northwestern Greenland contain grains of zircon that contain many tiny crystals, some altered by the impact . These zircon crystals act as tiny time capsules, helping researchers estimate when the impact occurred.Pebbles near the Hiawatha impact crater in northwestern Greenland contain grains of zircon that contain many tiny crystals, some altered by the impact .
That makes the crater far too old to be the smoking gun long sought by proponents of the controversial
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