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Some petroglyphs might be as old as 40,000s, and petroglyph sites in Australia are estimated to date back 27,000 years.
Petroglyph maps may show trails, symbols communicating time and distances traveled, as well as the local terrain in the form of rivers, landforms, and other geographic features.
Some of these reliefs exploit the rock's natural properties to define an image.
Rock reliefs have been made in many cultures, especially in the Ancient Near East.
Petroglyphs are found worldwide, and are often associated with prehistoric peoples.
The word comes from the Greek word petro-, theme of the word "petra" meaning "stone", and glyphein meaning "to carve", and was originally coined in French as pétroglyphe.