Ancestral Puebloan people chipped human figures, animals, and shapes into the desert varnish (oxidized surface) of 200,000-year-old volcanic basalt rock, here on the Mesa Point Trail, in Boca Negra Canyon, in Petroglyph National Monument, Albuquerque, New Mexico, USA. Archeologists estimate the 23,000 petroglyphs in the monument were created between 1000 BC and AD 1700.
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