Metal contamination in a sediment core from Osaka Bay during the last 400 years

Progress in Earth and Planetary Science

Table 2 Depth and radiocarbon-derived dates (± 1σ) of the molluscan shells retrieved from the piston core. The range of calendar ages defines a 68.2% confidence interval

Sample type	Lab. code	Depth	Conventional ¹⁴C age	Calibrated age (unmodeled)	Calibrated age (modeled)	Comment
Sample type	Lab. code	(cm)	(year BP)	(Cal. year BP)	(Cal. year BP)	Comment
Snail	MTC-15894	16	− 627 ± 41	Out of calibration	Out of calibration	a
Mollusca	MTC-16218	34	496 ± 63	49 ± 40	21 ± 23
Bivalve	MTC-16219	68	898 ± 64	217 ± 99	136 ± 29
Mollusca	MTC-16220	70	399 ± 52	40 ± 30	143 ± 30
Mollusca	MTC-16221	100	887 ± 66	207 ± 99	265 ± 30
Mollusca	MTC-16222	148	1282 ± 68	567 ± 76	466 ± 31
Bivalve	MTC-15951	152	857 ± 58	178 ± 91	–	b
Mollusca	MTC-15896	178	1287 ± 52	570 ± 66	582 ± 31
Snail	MTC-16223	212	1576 ± 65	826 ± 89	714 ± 32
Bivalve	MTC-15897	222	1442 ± 52	703 ± 78	751 ± 33
Echinus	MTC-15952	310	1816 ± 62	1075 ± 93	1090 ± 44
Echinus	MTC-16224	336	2145 ± 65	1413 ± 93	–	b
Echinus	MTC-15899	338	1946 ± 57	1201 ± 85	1148 ± 41
Echinus	MTC-16225	378	1915 ± 70	1169 ± 95	1230 ± 38
Mollusca	MTC-16226	459	2370 ± 65	1660 ± 105	–	b
Echinus	MTC-15953	481	2164 ± 59	1431 ± 89	1444 ± 32
Bivalve	MTC-15901	541	2285 ± 54	1561 ± 95	1569 ± 31
Mollusca	MTC-15954	571	2379 ± 75	1672 ± 114	1632 ± 32
Mollusca	MTC-16228	599	2615 ± 65	1959 ± 112	–	b
Bivalve	MTC-15902	623	2448 ± 52	1753 ± 96	1740 ± 34
Echinus	MTC-16230	677	2518 ± 71	1840 ± 114	1852 ± 38
Mollusca	MTC-16231	689	2455 ± 73	1763 ± 114	1877 ± 39
Bivalve	MTC-15955	691	2785 ± 72	2169 ± 116	–	b
Mollusca	MTC-15903	777	2687 ± 56	2051 ± 106	2064 ± 49
Echinus	MTC-16232	807	2810 ± 72	2198 ± 116	2128 ± 53
Echinus	MTC-15904	839	2818 ± 55	2207 ± 99	2195 ± 58

a: Excluded from the calculation of the sedimentation age model using P-sequence because the calibrated age exceeded 1950 AD
b: Excluded from the calculation of the sedimentation age model using P-sequence because the analyzed shells are of poor preservation