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Many hypotheses explain the purpose of petroglyphs, depending on their location, age, and subject matter.Some many be astronomical markers, maps, and other forms of symbolic communication, including a form of proto-writing.Except for Hittite and Persian examples, they are generally discussed as part of the culture's sculptural practice.The vertical relief is most common, but reliefs on essentially horizontal surfaces are also found.
Some of these reliefs exploit the rock's natural properties to define an image.
This could be mere coincidence, an indication that certain groups of people migrated widely from some initial common area, or indication of a common origin.
In 1853, George Tate presented a paper to the Berwick Naturalists' Club, at which a John Collingwood Bruce agreed that the carvings had "...
Rock reliefs have been made in many cultures, especially in the Ancient Near East.
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.