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Stone axes are a major feature of the archaeological evidence for Ireland's prehistory, with over 20,000 examples recorded by the Irish Stone Axe Project (ISAP). Porcellanite was the single most important raw material used in the manufacture of stone axes in Ireland, accounting for more than half of the total. Of the two known sources in Co. Antrim, north-east Ireland, the mainland site at Tievebulliagh...
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