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Proceedings of the National Academy of Sciences of the United States of America|September 29, 2007
Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas coolingR B Firestone, A West, J P Kennett, et al.Proceedings of the National Academy of Sciences of the United States of America|May 22, 2013
Evidence for deposition of 10 million tonnes of impact spherules across four continents 12,800 y agoJames H Wittke, James C Weaver, Ted E Bunch, et al.Proceedings of the National Academy of Sciences of the United States of America|July 29, 2015
Bayesian chronological analyses consistent with synchronous age of 12,835-12,735 Cal B.P. for Younger Dryas boundary on four continentsJames P Kennett, Douglas J Kennett, Brendan J Culleton, et al.Pageof 4