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Spirals Carved Into Colorado Rocks Thousands of Years Ago Could Be Ancient Calendars
The Castle Rock Pueblo settlement complex on the Mesa Verde plateau where Colorado borders Utah is well-known for buildings ...
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Discovery of 'calendar' rock carvings from Ancestral Pueblo in US Southwest surpasses 'wildest expectations'
While investigating a site in the US Southwest, archaeologists discovered a series of ancient rock carvings that early Native Americans may have used as a calendar. The site, known as the Castle ...