http://thesga.org SGA site, redux Tue, 07 Feb 2012 14:14:11 +0000 en hourly 1 http://thesga.org/2009/11/how-did-climate-change-affect-pleistocene-megafauna/ http://thesga.org/2009/11/how-did-climate-change-affect-pleistocene-megafauna/#comments Fri, 27 Nov 2009 10:00:02 +0000 sammy http://thesga.org/?p=4187 Read the full story for a discussion about what recent ecological reconstructions based on fossil pollen, charcoal and dung fungus spores tell us about the end of the Ice Age in interior North America.]]> http://thesga.org/2009/11/how-did-climate-change-affect-pleistocene-megafauna/feed/ 0 http://thesga.org/2009/06/buried-chemical-clues-to-our-human-past/ http://thesga.org/2009/06/buried-chemical-clues-to-our-human-past/#comments Fri, 26 Jun 2009 09:00:46 +0000 sammy http://thesga.org/?p=3340 Undisturbed archaeological sediments and remains include invisible chemical and physical clues to the past. Scientists studying ice cores from Antarctica and Greenland have analyzed the oxygen isotopes in small air bubbles contained in ice cores from ice that was formed thousands of years ago. They have found that the Earth underwent abrupt climate change between 14,700 and 14,500 years ago.]]> http://thesga.org/2009/06/buried-chemical-clues-to-our-human-past/feed/ 0 http://thesga.org/2009/03/timeline/ http://thesga.org/2009/03/timeline/#comments Mon, 09 Mar 2009 15:24:18 +0000 admin http://thesga.org/?p=1993 http://thesga.org/2009/03/timeline/feed/ 0