© Pierre BeckFieldwork at the edge of the Greenland Ice Sheet in 2019.
Danish and Swedish researchers have dated the enormous Hiawatha impact crater, a 31 km-wide asteroid crater buried under a kilometer of Greenlandic ice. The dating ends speculation that the asteroid impacted after the appearance of humans and opens up a new understanding of Earth's evolution in the post-dinosaur era.
Ever since 2015, when researchers at the University of Copenhagen's GLOBE Institute discovered the Hiawatha impact crater in northwestern Greenland, uncertainty about the crater's age has been the subject of considerable speculation. Could the asteroid have slammed into Earth as recently as 13,000 years ago, when humans had long populated the planet? Could its impact have catalyzed a nearly 1,000-year period of global cooling known as the Younger Dryas?
New analyses performed on grains of sand and rocks from the Hiawatha impact crater by the Natural History Museum of Denmark and the GLOBE Institute at the University of Copenhagen, as well as the Swedish Museum of Natural History in Stockholm, demonstrate that the answer is no.
The Hiawatha impact crater is far older. In fact, a
new study published in the journal Science Advances today reports
its age to be 58 million years old."Dating the crater has been a particularly tough nut to crack, so it's very satisfying that two laboratories in Denmark and Sweden, using different dating methods arrived at the same conclusion. As such, I'm convinced that we've determined the crater's actual age, which is much older than many people once thought," says Michael Storey of the Natural History Museum of Denmark.
Comment: This story is notable because it wasn't so long ago that experts were claiming that meteor-fireball sightings were a 'rare' occurrence, meanwhile in the last decades there has been a significant and demonstrable uptick in sightings, some that have been particularly spectacular. Moreover, the prominent part that Fire In The Sky events have had on human history is becoming ever more widely accepted by mainstream researchers:
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