Rock carvings found in Nevada are the oldest on the continent

08/14/2013 | LiveScience.com

Petroglyphs found etched in limestone boulders near Nevada's Winnemucca Lake are believed to be the oldest in North America, according to a study by researchers from the University of Colorado Boulder. Radiocarbon tests date the rock carvings to between 10,500 and 14,800 years ago.

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