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Petroglyphs are images created by removing part of a rock surface by incising, picking, carving, or abrading, as a form of rock art.

Outside North America, scholars often use terms such as "carving", "engraving", or other descriptions of the technique to refer to such images.

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Rock reliefs are generally fairly large, as they need to be to make an impact in the open air. Stylistically, a culture's rock relief carvings relate to other types of sculpture from period concerned.

Except for Hittite and Persian examples, they are generally discussed as part of the culture's sculptural practice.

Later glyphs from the Nordic Bronze Age in Scandinavia seem to refer to some form of territorial boundary between tribes, in addition to possible religious meanings.

Petroglyph styles has local or regional "dialects" from similar or neighboring peoples.

Some petroglyphs might be as old as 40,000s, and petroglyph sites in Australia are estimated to date back 27,000 years.

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