Ancient ‘Calendar’ Rock Carvings Discovered in Ancestral Pueblo Site

'Calendar' rock carvings from Ancestral Pueblo discovered.
The carvings were found at a site called Castle Rock Pueblo on the Mesa Verde plateau straddling the Colorado-Utah border. Early Native Americans may have used the ancient rock carvings as a calendar.

Credit: Live Science | imagery courtesy: Jagiellonian University | edited by Steve Spaleta