Definition of "petroglyph"

The petroglyphs of Central Asia form a long sequence from the Neolithic onwards.

1998, Henri-Paul Francfort, “17: Central Asian petroglyphs: between Indo-Iranian and shamanistic interpretations”, in Paul S. C. Taçon, editor, The Archaeology of Rock-Art, page 302

Ninety-six petroglyph sites were reported in the original study (DiazGranados 1993). The majority of the petroglyphs are worn.

2000, Carol Diaz-Granados, James R. Duncan, The Petroglyphs and Pictographs of Missouri, page 102

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.

2001, Georgia Lee, “18: Oceania”, in David S. Whitley, editor, Handbook of Rock Art Research, page 578