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δ13C values of C16:0 and C18:0 n-alkanoic acids extracted in three phases of Jōmon pottery from Torihama: (A) Incipient Jōmon, (B) Initial Jōmon, (C) Early Jōmon. The data are compared with reference ranges for authentic reference lipids from modern tissues and archaeological bone (Table S2) (9, 22, 25–31) (66.7% confidence). Samples with the full range of aquatic biomarkers are shown by filled circles.
