Editing Rock art (section)

===Petroglyphs===
{{Main|Petroglyph}}
[[File:Site archéologique de Bidzar4.jpg|thumb|Bidzar Petroglyphs in Cameroon]]
Petroglyphs are [[engraving]]s or carvings into rock which is left ''[[in situ]]''.  They can be created with a range of scratching, engraving or carving techniques, often with the use of a hard [[hammerstone]], which is battered against the stone surface. In certain societies, the choice of hammerstone itself has religious significance.<ref name="Whitley 11">Whitley 2005, p. 11.</ref> In other instances, the rock art is pecked out through indirect percussion, as a second rock is used like a [[chisel]] between the hammerstone and the panel.<ref name="Whitley 11"/> A third, rarer form of engraving rock art was through incision, or scratching, into the surface of the stone with a [[lithic flake]] or metal blade. The motifs produced using this technique are fine-lined and often difficult to see.<ref name="Whitley 2005. p. 13">Whitley 2005, p. 13.</ref>