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No evidence of nanodiamonds in Younger–Dryas sediments to support an impact event
The causes of the late Pleistocene megafaunal extinctions in North America, disappearance of Clovis paleoindian lithic technology, and abrupt Younger–Dryas (YD) climate reversal of the last deglacial warming in the Northern Hemisphere remain an enigma. A controversial hypothesis proposes that one or more cometary airbursts/impacts barraged North America ≈12,900 cal yr B.P. and caused these events. Most evidence supporting this hypothesis has been discredited except for reports of nanodiamonds...
Originally posted by JohnnyCanuck
Really too bad...it was a really interesting hypotheses that the end of the last Ice age was brought on by a comet impact. There remain a great number of geographical anomalies that this tale would have neatly accounted for...not to mention the extinctions of North American megafauna and the abrupt ending of the Clovis technology.