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A petroglyph is an image created by removing part of a rock surface by incising, picking, carving, or abrading, as a form of rock art. 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 worldwide, and are often associated with prehistoric peoples. The word comes from the Greek prefix petro-, from πέτρα petra meaning "stone", and γλύφω glýphō meaning "carve", and was originally coined in French as pétroglyphe.
Another form of petroglyph, normally found in literate cultures, a rock relief or rock-cut relief is a relief sculpture carved on "living rock" such as a cliff, rather than a detached piece of stone. While these relief carvings are a category of rock art, sometimes found in conjunction with rock-cut architecture, they tend to be omitted in most works on rock art, which concentrate on engravings and paintings by prehistoric or nonliterate cultures. 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. Rock reliefs are generally fairly large, as they need to be to make an impact in the open air. Most have figures that are larger than life-size.
Stylistically, a culture's rock relief carvings relate to other types of sculpture from period concerned. 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. The term relief typically excludes relief carvings inside natural or human-made caves, that are common in India. Natural rock formations made into statues or other sculpture in the round, most famously at the Great Sphinx of Giza, are also usually excluded. Reliefs on large boulders left in their natural location, like the Hittite İmamkullu relief, are likely to be included, but smaller boulders described as stele or carved orthostats.
In scholarly texts, a petroglyph is a rock engraving, whereas a petrograph is a rock painting. In common usage, the two words are synonymous. 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. Inuksuit are also not petroglyphs, they are human-made rock forms found only in the Arctic region.
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; many examples of petroglyphs found globally are dated to approximately the Neolithic and late Upper Paleolithic boundary (roughly 10,000 to 12,000 years ago), though some, such as those found at Kamyana Mohyla, were created earlier than this; some petroglyph sites in Australia are estimated to date back 27,000 years, and other examples of petroglyphs are estimated to be as old as 40,000 years.
Around 7,000 to 9,000 years ago, following the introduction of a number of precursors of writing systems, the existence and creation of petroglyphs began to suffer and tail off, with different forms of art, such as pictographs and ideograms, taking their place. However, petroglyphs continued to be created and remained somewhat common, with various cultures continuing to use them for differing lengths of time, including cultures who continued to create them until contact with Western culture was made in the 19th and 20th centuries.
Many hypotheses exist as to the purpose of petroglyphs, depending on their location, age, and subject matter. Some petroglyph images most likely held a deep cultural and religious significance for the societies that created them. Many petroglyphs are thought to represent a type of symbolic or ritualistic language or communication style that remains not fully understood. Others, such as geocontourglyphs, more clearly depict or represent a landform or the surrounding terrain, such as rivers and other geographic features.
Some petroglyph maps, depicting trails, as well as containing symbols communicating the time and distances travelled along those trails, exist; other petroglyph maps act as astronomical markers. As well as holding geographic and astronomical importance, other petroglyphs may also have been a by-product of various rituals: sites in India, for example, have seen some petroglyphs identified as musical instruments or "rock gongs".
Some petroglyphs likely formed types of symbolic communication, such as types of proto-writing. Later glyphs from the Nordic Bronze Age in Scandinavia seem to refer to some form of territorial boundary between tribes, in addition to holding possible religious meanings. Petroglyph styles have been recognised as having local or regional "dialects" from similar or neighboring peoples. Siberian inscriptions loosely resemble an early form of runes, although no direct relationship has been established.
Petrogylphs from different continents show similarities. While people would be inspired by their direct 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 presented 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 summarized 104 different theories on their interpretation.
More controversial explanations of similarities are grounded in Jungian psychology and the views of Mircea Eliade. According to these theories it is possible that the similarity of petroglyphs (and other atavistic or archetypal symbols) from different cultures and continents is a result of the genetically inherited structure of the human brain.
Other theories suggest that petroglyphs were carved by spiritual leaders, such as shamans, in an altered state of consciousness, perhaps induced by the use of natural hallucinogens. Many of the geometric patterns (known as form constants) which recur in petroglyphs and cave paintings have been shown by David Lewis-Williams to be hardwired into the human brain. They frequently occur in visual disturbances and hallucinations brought on by drugs, migraine, and other stimuli.
Recent analysis of surveyed and GPS-logged petroglyphs around the world has identified commonalities indicating pre-historic (7,000–3,000 BCE) intense auroras, or natural light display in the sky, observable across the continents.
The Rock Art Research Institute (RARI) of the University of the Witwatersrand studies present-day links between religion and rock art among the San people of the Kalahari Desert. 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 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.
List of petroglyph sites
Central African Republic
- Bambari, Lengo and Bangassou in the south; Bwale in the west
- Djebel Mela
Republic of the Congo
- The Niari Valley, 250 km south west of Brazzaville
- 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, is a large rock with carvings and writings ranging from Nabatean to Latin, Ancient Greek and Crusader eras located a few miles from the Ain Hudra Oasis. A second rock sites approximately 1 km from the main rock near the Nabatean tombs of Nawamis with carvings of 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.
- Ogooue River Valley
- Kongo Boumba
- Kaya Kaya
- The Draa River valley
- Driekops Eiland near Kimberley
- ǀXam and ǂKhomani heartland in the Karoo, Northern Cape
- Wildebeest Kuil Rock Art Centre near Kimberley, Northern Cape
- Keiskie near Calvinia, Northern Cape
- Nyambwezi Falls in the north-west province.
- Helankou in Yinchuan
- Hua'an Engravings
- Kangjia shimenzi in Xinjiang
- Lianyungan Rock Engravings
- Petroglyphs in Zhuhai
- Yin Mountains in Inner Mongolia
Eight sites in Hong Kong:
- Tung Lung Island
- Kau Sai Chau
- Po Toi Island
- Cheung Chau
- Shek Pik on Lantau Island
- Wong Chuk Hang and Big Wave Bay on Hong Kong Island
- Lung Ha Wan in Sai Kung
- Bhimbetka rock shelters, Raisen District, Madhya Pradesh, India.
- Kupgal petroglyphs on Dolerite Dyke, near Bellary, Karnataka, India.
- Kudopi, Sindhudurg District, Maharashtra, India.
- Hiwale, Sindhudurg District, Maharashtra, India.
- Barsu, Ratnagiri District, Maharashtra, India.
- Devihasol, Ratnagiri District, Maharashtra, India
- Edakkal Caves, Wayanad District, Kerala, India.
- Kollur, Triukoilur 35 km from Villupuram in Tamil Nadu. A large dolmen with four petroglyphs that portray men with trident and a wheel with spokes has been found. The discovery was made by K.T. Gandhirajan. This is the second instance when a dolmen with petrographs has been found in Tamil Nadu, India. In October 2018, petroglyphs were discovered in the Ratnagiri and Rajapur areas in the Konkan region of western Maharashtra. Those rock carvings which might date back to 10,000 BC, depict animals like hippopotamuses and rhinoceroses which aren't found in that region of India.. Some carving depicts, what appears to be Pisces constellation.* Perumukkal, Tindivanam District, Tamil Nadu, India.
- Kollur, Villupuram, Tamil Nadu.
- Unakoti near Kailashahar in North Tripura District, Tripura, India.
- Usgalimal rock engravings, Kushavati river banks, in Goa
- Ladakhi rock art in Ladakh, NW Indian Himalaya.
During recent years a large number of rock carvings has been identified in different parts of Iran. The vast majority depict the ibex. Rock drawings were found in December 2016 near Khomeyn, Iran, which may be the oldest drawings discovered, with one cluster possibly 40,000 years old. Accurate estimations were unavailable due to US sanctions.
Petroglyphs are the most ancient works of art left by humankind that provide an opening to the past eras of life and help us to discover different aspects of prehistoric lives. Tools to create petroglyphs can be classified by the age and the historical era; they could be flint, thighbone of hunted quarries, or metallic tools. The oldest pictographs in Iran are seen in Yafteh cave in Lorestan that date back 40,000 and the oldest petroglyph discovered belongs to Timareh dating back to 40,800 years ago.
Iran provides demonstrations of script formation from pictogram, ideogram, linear (2300 BC) or proto Elamite, geometric old Elamite script, Pahlevi script, Arabic script (906 years ago), Kufi script, and Farsi script back to at least 250 years ago. More than 50000 petroglyphs have been discovered, extended over all Iran's states.
- Awashima shrine (Kitakyūshū city)
- Fugoppe Cave, Hokkaido
- Hikoshima (Shimonoseki city)
- Temiya cave (Otaru city)
- Koksu River, in Almaty Province
- Chumysh River basin,
- Tamgaly Tas on the Ili River
- Tamgaly – a World Heritage Site nearly of Almaty
- Several sites in the Tien Shan mountains: Cholpon-Ata, the Talas valley, Saimaluu Tash, and on the rock outcrop called Suleiman's Throne in Osh in the Fergana valley
- "Graffiti Rocks", about 110 km SW of Riyadh off the Mecca highway
- Arwa, west of Riyadh
- al Jawf, near al Jawf
- Jubbah, Umm Samnan, north of Hail
- Janin Cave, south of Hail
- Yatib, south of Hail
- Milihiya, south of Hail
- Jebel al Lawz, north of Tabuk
- Wadi Damm, near Tabuk
- Wadi Abu Oud, near al Ula
- Shuwaymis, north of Madina
- Jebel al Manjour & Ratt, north of Madina
- Hanakiya, north of Madina
- Bir Hima, north of Najran
- Tathleeth, north of Najran
- Al-Magar, in Najd
- The Wanshan Rock Carvings Archeological Site near Maolin District, Kaohsiung, were discovered between 1978 and 2002.
- Rock engravings in Sapa, Sa Pa, Lào Cai Province
- Rock engravings in Namdan, Xín Mần District, Hà Giang Province
Petroglyphs at Cholpon-Ata in Kyrgyzstan
Petroglyph at Dalgarven Mill, Ayrshire, Scotland.
Bronze Age petroglyphs depicting weapons, Castriño de Conxo, Santiago de Compostela, Galicia.
Labyrinth, Meis, Galicia.
Cup-and-ring mark, Louro, Muros, Galicia.
Deer and cup-and-ring motifs, Tourón, Ponte Caldelas, Galicia.
- Boscawen-un, St Buryan
- Cup and ring marked rocks in:
- Hauensuoli, Hanko, Finland
- Rock Drawings in Valcamonica – World Heritage Site, Italy (biggest European site, over 350,000)
- Bagnolo stele, Valcamonica, Italy
- Grotta del Genovese, Sicily, Italy
- Grotta dell'Addaura, Sicily, Italy
- Rock Engravings in Grosio (in Valtellina), Italy
- Rock carvings at Alta, World Heritage Site (1985)
- Rock carvings in Central Norway
- Rock carvings at Møllerstufossen
- Rock carvings at Tennes
- Museum of Ayrshire Country Life and Costume, North Ayrshire
- Burghead Bull, Burghead
- Townhead, Galloway
- Ballochmyle cup and ring marks
- White Sea petroglyphs, Republic of Karelia, Russia
- Petroglyph Park near Petrozavodsk–Lake Onega, Russia
- Tomskaya Pisanitsa
- Kanozero Petroglyphs
- Sikachi-Alyan, Khabarovsk Krai
- Kapova cave, Bashkortostan
- Tanumshede (Bohuslän); World Heritage Site (1994)
- Himmelstalund (by Norrköping in Östergötland)
- Enköping (Uppland)
- Southwest Skåne (Götaland)
- Alvhem (Västra Götaland)
- Torhamn (Blekinge)
- Nämforsen (Ångermanland)
- Häljesta (Västmanland)
- Slagsta (Södermanland)
- Glösa (Jämtland)
- Gärde (Jämtland)
- Flatruet (Härjedalen)
- Grannberget (Härjedalen)
- The King's Grave at Kivik
- Rock carvings at Norrfors, Umeå
- Släbro rock carvings in Nyköping (Södermanland)
- Kagizman, Kars
- Cunni Cave, Erzurum
- Esatli, Ordu
- Gevaruk Valley, Hakkâri
- Hakkari Trisin, Hakkâri
- Latmos / Beşparmak
- Güdül, Ankara
Central and South America and the Caribbean
- Cueva de las Manos, Santa Cruz
- Talampaya National Park, La Rioja
- Lihué Calel National Park, La Pampa
Petroglyph on Tunduqueral hill at Uspallata, Argentina
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.
- Serra da Capivara National Park, a UNESCO World Heritage Site, Piauí
- Vale do Catimbau National Park, Pernambuco
- Ingá Stone, Paraíba
- Costao do Santinho, Santa Catarina
- Lagoa Santa (Holy Lake), Minas Gerais
- Ivolandia, Goiás
Numerous rocks boasting thousand-year-old carvings.
Modern science and the spectre of ancient man coexist in this thought-provoking image of a petroglyph.
Llamas at La Silla
Petroglyph in the Chiribiquete Natural National Park. Aboriginal
Petroglyphs in the Chiribiquete Natural National Park.
- Cueva de las Maravillas, San Pedro de Macorís
- Las Caritas, near Lake Enriquillo
- Los Tres Ojos, Santo Domingo
- Cumbe Mayo, Cajamarca
- Petroglyphs of Pusharo, Manú National Park, Madre de Dios region
- Petroglyphs of Quiaca, Puno Region
- Petroglyphs of Jinkiori, Cusco Region
Saint Kitts and Nevis
Trinidad and Tobago
- Caicara del Orinoco, Bolívar
- Morrocoy National Park, Falcón
- Piedra Pintada Archeological Park within San Esteban National Park, Guaraca, Carabobo
- Sardinata Beach, Amazonas
- Taima Taima, Falcón
- Kejimkujik National Park, Nova Scotia
- Petroglyph Provincial Park, Nanaimo, British Columbia
- Petroglyphs Provincial Park, north of Peterborough, Ontario
- Agnes Lake, Quetico Provincial Park, Ontario
- Sproat Lake Provincial Park, near Port Alberni, British Columbia
- Stuart Lake, British Columbia
- St. Victor Provincial Park, Saskatchewan
- Writing-on-Stone Provincial Park, east of Milk River, Alberta
- Gabriola Island, British Columbia
- East Sooke Regional Park, British Columbia
- Ancient Echoes Interpretive Centre, Herschel Saskatchewan
- Lake Temagami, Ontario 
- Boca de Potrerillos, Mina, Nuevo León
- Chiquihuitillos, Mina, Nuevo León
- Cuenca del Río Victoria, near Xichú, Guanajuato
- Coahuiltecan Cueva Ahumada, Nuevo León
- La Proveedora, Caborca, Sonora
- Samalayuca, Juarez, Chihuahua
- Las Labradas, near Mazatlán, Sinaloa
- Arches National Park, Utah
- Bandelier National Monument, New Mexico
- Barnesville Petroglyph, Ohio
- Bloomington Petroglyph Park, Utah
- Capitol Reef National Park, Utah
- Caguana Indian Park, Utuado, Puerto Rico
- Columbia Hills State Park, Washington
- Corn Springs, Colorado Desert, California
- Coso Rock Art District, Coso Range, northern Mojave Desert, California
- Death Valley National Park, California
- Dinosaur National Monument, Colorado and Utah
- Dighton Rock, Massachusetts
- Dominguez Canyon Wilderness, Colorado
- Fremont Indian State Park Utah
- Grand Traverse Bay Michigan
- Great Basin National Park Nevada
- Grimes Point, Nevada
- Independence Slab, Ohio
- Inscription Rock (Kelleys Island, Ohio), Ohio
- Jeffers Petroglyphs, Minnesota
- Judaculla Rock, North Carolina
- Kanopolis State Park, Kansas
- La Cueva del Indio (Indians Cave), Arecibo, Puerto Rico
- La Piedra Escrita (The Written Rock), Jayuya, Puerto Rico
- Lava Beds National Monument, Tule Lake, California
- Legend Rock Petroglyph Site, Thermopolis, Wyoming
- Lemonweir Glyphs, Wisconsin
- Leo Petroglyph, Leo, Ohio
- Mesa Verde National Park, Colorado
- Newspaper Rock State Historic Monument, Utah
- Olympic National Park, Washington
- Paintlick Mountain, Tazewell, Virginia
- Petit Jean State Park, Arkansas
- Petrified Forest National Park Arizona
- Petroglyph National Monument, New Mexico
- Picacho Mountain, Picacho Arizona
- Picture Canyon, Flagstaff, Arizona
- Picture Rocks, Picture Rocks, Arizona
- Puye Cliff Dwellings, New Mexico
- Red Rock Canyon National Conservation Area, Nevada
- Rochester Rock Art Panel, Utah
- Ring Mountain, Marin County, California
- Saint John, U.S. Virgin Islands
- Sanilac Petroglyphs Historic State Park, Sanilac County, Michigan
- Sedona, Arizona
- Seminole Canyon, Texas
- Sloan Canyon National Conservation Area, Nevada
- South Mountain Park, Arizona
- The Cove Palisades State Park, Oregon
- Three Rivers Petroglyphs, New Mexico
- Tibes Indian Park, Ponce, Puerto Rico
- Valley of Fire State Park, Nevada
- Washington State Park, Washington County, Missouri
- West Virginia glyphs
- White Mountain (Wyoming), Rock Springs, Wyoming
- White Tank Mountain Regional Park, Waddell, Arizona
- Winnemucca Lake, Nevada
- Writing Rock State Historical Site, North Dakota
- Monolyth at Caguas & El Yunque, Puerto Rico
- Track Rock, Union County Georgia
- Forsyth Petroglyph Originally discovered, locates and documented near Cumming, Georgia in Forsyth County but has been relocated to the campus of the University of Georgia in Athens, Georgia
Petroglyphs on a Bishop Tuff tableland, eastern California
Animal print carvings outside of Barnesville, Ohio
Upside-down man in Western Colorado
Web-like petroglyph on the White Tank Mountain Regional Park Waterfall Trail, Arizona
Chipping petroglyph on the White Tank Mountain Regional Park Waterfall Trail, Arizona
Detail of a carved archer-like figure, Sanilac Petroglyphs Historic State Park, Sanilac County, Michigan
- Arnhem Land / Kakadu National Park, Northern Australia
- Gosford Glyphs in Central Coast, NSW (widely regarded as archaeological forgery)
- Murujuga, Western Australia – world heritage assessed
- Sydney Rock Engravings, New South Wales
Part of a 20-metre-long petroglyph at Ku-ring-gai Chase National Park, New South Wales
Mutawintji National Park, New South Wales
Burrup Peninsula, Western Australia
- History of communication
- List of Stone Age art
- Megalithic art
- Pecked curvilinear nucleated
- Runestone and image stone
- Water glyphs Rock Art Studies: A Bibliographic Database Bancroft Library's citations to rock art literature.
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- Beckensall, Stan and Laurie, Tim, Prehistoric Rock Art of County Durham, Swaledale and Wensleydale, County Durham Books, 1998 ISBN 1-897585-45-4
- Beckensall, Stan, Prehistoric Rock Art in Northumberland, Tempus Publishing, 2001 ISBN 0-7524-1945-5
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- Rock Art Studies: A Bibliographic Database Bancroft Library's citations to rock art literature.