Danish and Swedish researchers have now dated the giant Hiawatha crater, 31 km wide, discovered in Greenland, back in 2015.
Go to https://phys.org/news/2022-03-giant-impact-crater-greenland-million.html … The dating brings to an end speculation that the crater was formed fairly recently, at the Younger Dryas boundary for example. The latter does not require a crater as it is more likely that the earth passed through a stream of debris, resulting in multiple meteor explosions in the atmosphere. Nevertheless, anti-Younger Dryas boundary event sources seem quite ecstatic that Hiawatha dates much older than some people hoped. In geological terminology the new date for the crater is 58 millions years ago. In that case it is not too distant from the asteroid that is thought to have brought the dinosaurs to extinction, at around 65 million years ago. See https://doi.org/10.1126/sciadv.abm2434 …
See also https://www.sciencenews.org/article/hiawatha-crater-greenland-age-younger-dryas … which emphasizes it has nothing to do with the Younger Dryas event.
At www.sciencedaily.com/releases/2022/03/220309140838.htm … and https://science.ku.dk/english/press/news/2022/giant-impact-crater-in-greenland-occurred-a-few-million-years-after-dinosaurs-went-extinct/ …
The age was determined by laser beams and grains of sand. For a different perspective go to https://cosmictusk.com/hiawatha-crater-still-smoking/ … This was posted in February of 2020, two years ago. However, the new findings have spawned another mystery. The date of 58 million years ago is very close to the dinosaur killing asteroid at the end of the Cretaceous. In addition, the new date appears to coincide with a particularly warm period of climate, quite the opposite one would think to be associated with a asteroid or meteor strike. Cooling would normally be expected but the beginning of the Eocene was markedly different. Expect some interesting responses for the new date, in coming months.