PETROGLYPHS
OR PICTOGRAPHS
Is it a petroglyph [carving] or a pictograph
[painting]? Rock-art includes both petroglyphs and pictographs, and
there is a third type called incised lines. Incised lines
are very, thin carved-lines, knife blade edge in width but usually scratched
with a thin piece of obsidian or hard chert-like stone. Within my
definition incised lines are petroglyphs.
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Petroglyphs Pictographs