. . . . . . . . . . "Evidence for an extraterrestrial impact event 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling"@en . . . . . . . . . . "Evidence for an Extraterrestrial Impact Event 12,900 years ago that Contributed to Megafaunal Extinctions and the Younger Dryas Cooling"@en . . . "abstract PP43A-01 for the American Geophysical Union, Spring Meeting 2007"@en . . . . . . . . . . . . . . . . "Evidence for an Extraterrestrial Impact Event 12,900 years ago that Contributed to Megafaunal Extinctions and the Younger Dryas Cooling"@en . . . . . . . "PP43A-01"@en . . . . . . . "2007-05-22T00:00:00Z"^^ . . . . . . . . "2007AGUSMPP43A..01F" . . . . . . . "Evidence for an Extraterrestrial Impact Event 12,900 years ago that Contributed to Megafaunal Extinctions and the Younger Dryas Cooling"@en . "Evidence for an Extraterrestrial Impact Event 12,900 years ago that Contributed to Megafaunal Extinctions and the Younger Dryas Cooling"@en . . . . . . . . . .