Evidence of a 25,000-year-old pictograph
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Alan Watchman
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Article
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1993
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John Wiley and Sons
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English
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Carbon-bearing substances (charcoal and oxalate minerals) contained in rock surface mineral accretions obscuring pictographs (rock paintings) provide an indirect way of radiocarbon dating the rock art. This article describes the chronological sequence of mineralogical laminations in rock crusts at a