Petroglyphs of abstract and geometric designs are found on the rock of the Three Rivers Petroglyph Site in New Mexico. The Three Rivers Petroglyph Site, which is under federal protection, contains more than 21,000 glyphs created by the Jornada Mogollon people who lived in the area between 900 and 1400 AD. It is one of the largest petroglyph sites in the American Southwest. The Jornada Mogollon people created the petroglyphs by using stone tools to remove the dark patina on the exterior of the rock.
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