. . "petroglyph"@en . "Within the Mongolian Altai, all open-air petroglyphic imagery surviving from the pre-Modern period is engraved, scratched, gouged or pecked into the surface of bedrock or boulders; for this reason, this imagery is referred to as petroglyphic rather than pictographic. Petroglyphs are represented by single images or by compositions of two or more images up to several hundred motifs."@en . . "petroglyphs"@en . . "2015-07-16"^^ . "2015-07-16"^^ .