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Excavations at Aghitu-3 Cave in Armenia revealed stratified Upper Palaeolithic archaeological horizons (AHs), spanning from 39 to 36,000 cal BP (AH VII) to 29–24,000 cal BP (AH III) and from which we identified the sources of 1120 obsidian artifacts. Not only does AH III—deposited at the onset of the Last Glacial Maximum—have the most artifacts from non-regional sources but also the artifacts originate...
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