- A decorative design or illustration, often an anthropomorphic or geometrical image, carved into a stone surface, such as a cave wall or free-standing stone. Usually, though not always, of Prehistoric date.
- English Heritage
- http://creativecommons.org/licenses/by/3.0 (FISH Thesaurus of Monument Types)
- http://www.english-heritage.org.uk (FISH Thesaurus of Monument Types)
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