YAZD, Jun. 27 (MNA) – Eighty kilometres southwest of Yazd city, in the slate rock of the Arnan height, thirty one rock art petroglyphs (scraped or scratched rock art) figures dating to the stone ages (the Neolithic) - that is some 4,000 to 12,000 years ago - were discovered when excavating a water channel called a kareez or qanat.
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