This May 2012 photo provided by the Nevada State Museum shows ancient carvings on limestone boulders near Nevada's Pyramid Lake which have been confirmed to be the oldest recorded petroglyphs in North... more 
This May 2012 photo provided by the Nevada State Museum shows ancient carvings on limestone boulders near Nevada's Pyramid Lake which have been confirmed to be the oldest recorded petroglyphs in North America - at least 10,500 years old. Larry Benson, the curator of anthropology at the University of Colorado Natural History Museum, and Eugene Hattori, curator of anthropology at the Nevada State Museum, were among the co-authors of a paper on the findings published August 2013 in the Journal of Archaeological Science. This site was once the shoreline of the now dried up Winnemucca Lake. (AP Photo/Nevada State Museum, Eugene Hattori) less 
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Associated Press | Photo By Nevada State Museum, Eugene Hattori
Wed, Aug 14, 2013 5:56 PM EDT