Spiral petroglyphs carved into a canyon wall on the Colorado-Utah border may have been used as a calendar by the Ancestral Pueblo.
The rest of the story
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Discovery of 'calendar' rock carvings from Ancestral Pueblo in US Southwest surpasses 'wildest
Spiral petroglyphs carved into a canyon wall on the Colorado-Utah border may have been used as a calendar by the Ancestral Pueblo.
The rest of the story
livescience.com
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