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Hiawatha Crater is older than thought

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Hiawatha Crater is older than thought

The Hiawatha crater in western Greenland, previously estimated to be very small, formed long before the island glaciation. This is the result of detailed isotope studies on sands and minerals by a team led by Gavin G. Kenny of the Swedish Museum of Natural History in Stockholm. As stated by the working group in “Science Advances”, resetting the primary and isotopic ratios of the samples used as a “geological clock” to zero occurred 58 million years ago. At the same time, zircons with a low content of uranium and lead show characteristic damage to the crystal lattice, which may be caused by the intense shock wave of an asteroid impact. Experts conclude that the crater was formed long before the current Ice Age.

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