Petroglyphs were still common though, and some cultures continued using them much longer, even until contact with Western culture was made in the 19th and 20th centuries.Petroglyphs have been found in all parts of the globe except Antarctica, with highest concentrations in parts of Africa, Scandinavia, Siberia, southwestern North America, and Australia.
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.
The term petroglyph should not be confused with petrograph, 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 or parietal art.
Petroforms, or patterns and shapes made by many large rocks and boulders over the ground, are also quite different.
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.