New evidence supporting extraterrestrial impact at the start of the Younger Dryas

There’s a new paper in PNAS worth having a look at. It seems the authors found some very strong evidence for a comet or asteroid impact during the period known as the Younger Dryas. According to Wikipedia: The Younger Dryas stadial, also referred to as the Big Freeze, was a geologically brief (1,300 ± 70…

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