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http://www.nap.edu/openbook.php?record_id=10136&page=32, Abrupt Climate Change: Inevitable Surprises (2002),FIGURE 2.4 Global extent of terrestrial (pollen) and ice core (isotopic) evidence where the Younger Dryas cooling (11 500–13 000 BP) has been found.
http://www.esd.ornl.gov/projects/qen/nercEUROPE.html, Europe During The Last 150,000 YEARS, Compiled by Jonathan Adams, Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling. PNAS, 9.10.2007, 104. vsk, nro 41, s. 16016–16021. Artikkelin verkkoversio. (englanniksi)