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Petroglyph

Petroglyphs are images incised in rock, usually by prehistoric, especially Neolithic, peoples.

They were an important form of pre-writing symbols, used in communication from approximately 10,000 B.C.E. to modern times.

Note:   The above text is excerpted from the Wikipedia article "Petroglyph", which has been released under the GNU Free Documentation License.
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July 1, 2015

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updated 12:56 pm ET