A geochemical analysis of debitage from the only known fine-grained basalt source (quarry) in Tonga is described, thus filling a geographical gap that will enhance artefact source assignments for prehistoric interaction studies. Four pieces were analysed from the most southern Tongan island of ‘Ata: two flakes from an adze workshop above a cobble beach and the source of the basalt, and two additional flakes from a habitation terrace on the upper plateau. All material is geochemically similar and from the same source. The flakes from the habitation terrace were associated with Polynesian plainware ceramics dated to about 2000 BP, which makes the ‘Ata source one of the oldest adze quarries now known in Polynesia.
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