petroglyph

1. (archaeology) A rock carving, especially one made in prehistoric times.Examples: "The petroglyphs of Central Asia form a long sequence from the Neolithic onwards."; "Ninety-six petroglyph sites were reported in the original study (DiazGranados 1993). The majority of the petroglyphs are worn."; "The islands of Tonga are not known for petroglyphs; however, one of the frontal stones of a langi called Mala'e Lahi on 'Uiha Island has one petroglyph of a human foot."