δ 13 C inf varies between − 0.15 and 1.11‰ (Additional file 3 ), showing low values from MIS 20 to early MIS 19c and high values in MIS 19b through early MIS 18, and a decreasing trend toward the middle of MIS 18 (Fig. 2 c).
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Paleoceanography of the northwestern Pacific across the Early-Middle Pleistocene boundary (Marine Isotope Stages 20-18).
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