27 July 2015
At the end of the Pleistocene period, approximately 12,800 years ago — give or take a few centuries — a cosmic impact triggered an abrupt cooling episode that earth scientists refer to as the Younger Dryas. New research has narrowed the date to a 100-year range, sometime between 12,835 and 12,735 years ago.img src=”http://feeds.feedburner.com/~r/sciencedaily/~4/vT2EKoA9qEg” height=”1″ width=”1″ alt=””/
http://feeds.sciencedaily.com/~r/sciencedaily/~3/vT2EKoA9qEg/150727180224.htm
