Archaeologists who explored the remote mesas of Northern Arizona have identified a previously undocumented group of...

Originally shared by Ancient Origins

Archaeologists who explored the remote mesas of Northern Arizona have identified a previously undocumented group of petroglyphs. One of the markings is a prehistoric solar calendar that has been following the seasons for more than 700 years with a shadow dagger that travels across the sandstone face. 
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http://www.ancient-origins.net/news-history-archaeology/more-1500-petroglyphs-including-solar-calendar-found-northern-arizona-020787