Petroglyphs (also called rock engravings in low relief) are pictogram and logogram images created by removing part of a rock surface by incising, pecking, carving, and abrading. Outside North America, scholars often use terms such as "carving", "engraving", or other descriptions of the technique to refer to such images. Petroglyphs are found world-wide, and are often (but not always) associated with prehistoric peoples. The word comes from the Greek words petros meaning "stone" and glyphein meaning "to carve", and was originally coined in French as pétroglyphe.
The term petroglyph should not be confused with pictograph, which is an image drawn or painted on a rock face. Both types of image belong to the wider and more general category of rock art and Petroforms, or patterns and shapes made by many large rocks and boulders over the ground, are also quite different. Inukshuks are also unique, and found only in the Arctic (except for reproductions and imitations built in more southerly latitudes).
By Carlos: It's very common to find out spreading around the world Petroglyphs known as in Brazil "Itaquatiara" originated by Indigenous language Rock's caved, check out some examples of Petroglyphs in Utah, USA and Brazil, Pedra do Ingá (Inga's Stone) located in Paraíba State. There are not so many information about this tradition (name given by the Indigenous group who settled down around 6.000 year B.P). Check out the pictures bellow.
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