Oz Geographic has a lot of videos on large meteor impacts and their consequences. There are more common than most people think, and the primary reason that not much is known of the majority is because the impact craters are hidden in the oceans or, in this case, beneath thousands of feet of ice.
This particular video is of the 31-kilometre wide Hiawatha impact crater found under the Hiawatha glacier in northwest Greenland. Because of the condition of the crater, scientist initially believed it was a young crater and it was even proposed to have been the crater from the Younger Dryas Impact Event. However, better dating indicates that the crater was formed about 58 million years ago. The impact was during one of the many periods when Greenland was ice-free (in fact, the current ice sheets did not appear until about 3 million years ago when we entered the current ice age--we are currently in a relatively warm inter-glacial period).
VIDEO: "A Meteorite Crater Hidden Beneath The Ice"
OzGeology (9 min.)
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