July 24, 2021
In 2018, researchers discovered a large meteor crater (±31. km diameter) beneath the ice of northwest Greenland. The very low amount of erosion indicates that it is relatively new, but because the rate of erosion in the arctic is so low, pinning the (semi-)exact age down is problematic. Best guess is between 11.700 years ago, or the beginning of the Holocene interglacial period, which we currently enjoy, and 2.6 million years ago, at the beginning of the Pleistocene, that period of intensified glaciation that continues to this day. That's a pretty big range
It's also a pretty big crater, about 25 times farther across than the famous Barringer Crater, AKA Meteor Crater, in Arizona, which some of you have probably seen.
The meteorite that caused the Greenland crater was probably in the range of 2 km across. On average such an impact occurs somewhere on the planet ever couple of million years. Something to look forward to!
The large range in estimated age is just another example of the uncertainty in science, which is plentiful and ongoing.
https://globalnews.ca/news/7912739/western-university-research-greenland-impact-crater/
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