Archaeologists exploring the remote mesas of northern Arizona have uncovered a trove of previously undocumented rock art, including more than 1,500 petroglyphs, and confirmed the presence a prehistoric solar calendar, which has been marking the seasons for more than 700 years with a striking “shadow dagger” that travels across its sandstone face.
Researchers made these finds in the backcountry of Wupatki National Monument northeast of Flagstaff, which includes the ruins of dozens of sites built by Ancestral Puebloans known as the Kayenta and the Sinagua.
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