Petroglyphs (also called rock engravings) are pictogram and logogramimages created by removing part of a rock surface by incising, picking, 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 associated with prehistoric peoples. The word comes from the Greek words 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. Inukshuks are also unique, and found only in the Arctic (except for reproductions and imitations built in more southerly latitudes).
A petroglyph in the Paria Canyon near Kanab, Utah, USA; one of the many petroglyphs found in this region. desert southwest
Some petroglyphs are dated to approximately the Neolithic and late Upper Paleolithic boundary, about 10,000 to 12,000 years ago, if not earlier (Kamyana Mohyla). Sites in Australia have petroglyphs that are estimated to be as much as 27,000 years old, and in other places could be as old as 40,000 years. Around 7,000 to 9,000 years ago, other precursors of writing systems, such as pictographs and ideograms, began to appear. Petroglyphs were still common though, and some cultures continued using them much longer, even until contact with Western culture was made in the 20th century. 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.
There are many theories to explain their purpose, depending on their location, age, and the type of image. Some petroglyphs are thought to be astronomical markers, maps, and other forms of symbolic communication, including a form of "pre-writing". 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. A petroglyph that represents a landform or the surrounding terrain is known as a geocontourglyph. They might also have been a by-product of other rituals: sites in India, for example, have been identified as musical instruments or "rock gongs".
Some petroglyph images probably have deep cultural and religious significance for the societies that created them; in many cases this significance remains for their descendants. Many petroglyphs are thought to represent some kind of not-yet-fully understood symbolic or ritual language. 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. It also appears that local or regional dialects from similar or neighboring peoples exist. The Siberian inscriptions almost look like some early form of runes, although there is not thought to be any relationship between them. They are not yet well understood.
Some researchers have noticed the resemblance of different styles of petroglyphs across different continents; while it is expected that all people would be inspired by their surroundings, it is harder to explain the common styles. 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 read a paper to the Berwick Naturalists' Club, at which a John Collingwood Bruce agreed that the carvings had "... a common origin, and indicate a symbolic meaning, representing some popular thought." In his cataloguing of Scottish rock art, Ronald Morris summarised 104 different theories on their interpretation.
Recent analysis of surveyed and GPS logged petroglyphs around the world has identified commonalities indicating pre-historic (7,000–3,000 B.C.) intense auroras observable across the continents. Specific common associated archetypes include: squatting man, caterpillars, ladders, eye mask, kokopelli, spoked wheels, and others.
Present-day links between shamanism and rock-art amongst the San people of the Kalahari desert have been studied by the Rock Art Research Institute (RARI) of the University of the Witwatersrand. Though the San people's artworks are predominantly paintings, the beliefs behind them can perhaps be used as a basis for understanding other types of rock art, including petroglyphs. To quote from the RARI website:
Using knowledge of San beliefs, researchers have shown that the art played a fundamental part in the religious lives of its San painters. The art captured things from the San’s world behind the rock-face: the other world inhabited by spirit creatures, to which dancers could travel in animal form, and where people of ecstasy could draw power and bring it back for healing, rain-making and capturing the game.
Wadi Hammamat in Qift, many carvings and inscriptions dating from before the earliest Egyptian Dynasties to the modern era, including the only painted petroglyph known from the Eastern Desert and drawings of Egyptian reed boats dated to 4000 BCE
Inscription Rock in South Sinai, a large rock with carvings and writings ranging from Nabatean to Latin, Ancient Greek and Crusder eras located a few miles from the Ain Hudra Oasis. There is also a second rock approximately 1 km from the main rock near the Nabatean tombs of Nawamis with carvings of various animals including Camels, Gazelles and others. The original archaeologists who investigated these in the 1800s have also left their names carved on this rock.
Giraffe petroglyphs found in the region of Gebel el-Silsila. The rock faces have been used for extensive quarrying of materials for temple building especially during the period specified as the New Kingdom . The Giraffe depictions are located near a stela of the king Amenhotep IV. The images are not dated, but they are probably dated from the Predynastic periods.
Recently petroglyphs were found from Kollur village in Tamil Nadu. A big dolmen with four petroglyphs that portray men with trident and a wheel with spokes has been found at Kollur near Triukoilur 35 km from Villupuram. The discovery was made by K.T. Gandhirajan. This is the second time that a dolmen with petrographs has been found in Tamil Nadu, India.
The oldest reliably dated rock art in the Americas is known as the "Horny Little Man." It is petroglyph depicting a stick figure with an oversized phallus and carved in Lapa do Santo, a cave in central-eastern Brazil and dates from 12,000 to 9,000 years ago.
^J. Collingwood Bruce (1868; cited in Beckensall, S., Northumberland's Prehistoric Rock Carvings: A Mystery Explained. Pendulum Publications, Rothbury, Northumberland. 1983:19)
^Morris, Ronald (1979) The Prehistoric Rock Art of Galloway and The Isle of Man, Blandford Press, ISBN 978-0-7137-0974-2.
^[see Lewis-Williams, D. 2002. A Cosmos in Stone: Interpreting Religion and Society through Rock Art. Altamira Press, Walnut Creek, Ca.]
^Peratt, A.L. (2003). "Characteristics for the occurrence of a high-current, Z-pinch aurora as recorded in antiquity". IEEE Transactions on Plasma Science31 (6): 1192. doi:10.1109/TPS.2003.820956.
^Peratt, Anthony L.; McGovern, John; Qoyawayma, Alfred H.; Van Der Sluijs, Marinus Anthony; Peratt, Mathias G. (2007). "Characteristics for the Occurrence of a High-Current Z-Pinch Aurora as Recorded in Antiquity Part II: Directionality and Source". IEEE Transactions on Plasma Science35 (4): 778. doi:10.1109/TPS.2007.902630.
^Parkington, J. Morris, D. & Rusch, N. 2008. Karoo rock engravings. Clanwilliam: Krakadouw Trust; Morris, D. & Beaumont, P. 2004. Archaeology in the Northern Cape: some key sites. Kimberley: McGregor Museum.