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Table 1 Sampled species, core depths, and results of radiocarbon dating

From: Climatic reconstruction at the Sannai-Maruyama site between Bond events 4 and 3—implication for the collapse of the society at 4.2 ka event

Sample type Specific name Sample no. Depth (cm) 14C age (yrs BP) Calendar age (cal. yrs BP)
Mollusca Mizuhopecten yessoensis (Jay) 1–2 3.3 1080 ± 80 630 ± 70
Mollusca Mizuhopecten yessoensis (Jay) 2–6 27.5 4030 ± 100 4051 ± 144
Benthic foraminifera Mixed species 2–6 27.5 4170 ± 90 4259 ± 126
Mollusca Leionucula tenuis (Montagu) 2–43 111.5 4930 ± 90 5263.5 ± 141
Mollusca Ringiculina doliaris (Gould) 3–28 177.4 5600 ± 110 6016.5 ± 127
Benthic foraminifera Mixed species 3–28 177.4 5610 ± 100 6017.5 ± 117
Mollusca Mizuhopecten yessoensis (Jay) 4–15 248.6 6160 ± 120 6591 ± 140
Mollusca Mercenaria stimpsoni (Gould) 5–39 403.9 7830 ± 110 8283 ± 109
Mollusca Raetellops pulchellus (Adams & Reeve) 8–6 633.9 9450 ± 90 10,301.5 ± 106
Mollusca Macoma cf. tokyoensis (Makiyama) 8–25 674.5 9490 ± 90 10,342.5 ± 113