A possible impact in the Laurentide ice sheet in northeastern North America some 13,000 years ago is the subject of a new National Geographic special. Called “Mammoth Mystery,” the show ran yesterday and will replay multiple times this week. A clip from the show is available online. This is the impact (discussed in these pages in late May) that is implicated, some believe, in the extinction of the mammoth and mastodon, with presumably devastating effects on local human populations.
A press conference on this event is now available on YouTube, while National Public Radio’s Science Friday show offers its coverage here. The paper is Firestone et al., “Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas,” Proceedings of the National Academy of Sciences 10.1073/pnas.0706977104 (27 September, 2007). Abstract online.