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Table 5 Results of radiocarbon dating of samples in SKN-E, SKN-W, and SKN-GS

From: Washover deposits related to tsunami and storm surge along the north coast of the Shimokita Peninsula in northern Japan

Sample no

Lab. no

Location or core name

Sample position

Material

δ13C [‰]

Conventional 14C age [yr BP]

Calibrated age (2σ) [cal BP]

Remark

1

IAAA-181081

SKN-W

E4/E5

Organic sediment

− 25.82 ± 0.23

424 ± 22

520–460 (95.4%)

 

2

IAAA-181082

SKN-W

E5/B-Tm

Organic sediment

− 30.24 ± 0.20

979 ± 22

930–890 (33.4%), 880–790 (62.1%)

 

3

IAAA-181805

SKN-W

B-Tm/E6

Organic sediment

− 28.44 ± 0.20

1315 ± 22

1300–1240 (50.5%), 1220–1170 (44.9%)

 

4

IAAA-181083

SKN-W

E6/E7

Organic sediment

− 27.41 ± 0.21

1357 ± 23

1310–1260 (87.0%), 1210–1170 (8.5%)

 

5

IAAA-210212

SKN-W

below E10

Plant fragment

− 30.13 ± 0.19

1815 ± 24

1820–1810 (0.9%), 1800–1760 (4.9%), 1750–1690 (63.7%), 1670–1620 (26.0%)

 

6

IAAA-210213

SKN-W

below E11

Organic sediment

− 29.97 ± 0.21

2724 ± 24

2870–2760 (95.4%)

 

7

IAAA-200962

SKN-W

below E14

Organic sediment

− 29.79 ± 0.26

3992 ± 26

4530–4410 (95.4%)

 

8

IAAA-210214

SKN-E

below E5

Organic sediment

− 28.61 ± 0.15

3970 ± 27

4530–4400 (89.9%), 4370–4350 (2.2%), 4330–4300 (3.3%)

 

9

IAAA-210215

SKN-E

below E6

Organic sediment

− 24.25 ± 0.26

4320 ± 27

4960–4830 (95.4%)

 

10

IAAA-211205

SKN-E

E11/E12

Organic sediment

− 26.07 ± 0.23

5418 ± 29

6290–6180 (93.0%), 6140–6120 (2.5%)

 

11

IAAA-210649

SKN-GS1

58–59 cm in depth

Organic sediment

− 25.92 ± 0.24

542 ± 22

630–590 (18.0%), 560–520 (77.4%)

 

12

IAAA-210367

SKN-GS1

118–119 cm in depth

Organic sediment

− 25.83 ± 0.19

3931 ± 25

4510–4490 (2.2%), 4440–4250 (93.2%)

 

13

IAAA-210368

SKN-GS1

141–142 cm in depth

Organic sediment

− 25.39 ± 0.18

4209 ± 25

4850–4790 (33.3%), 4760–4690 (48.2%), 4680–4640 (14.0%)

 

14

IAAA-210645

SKN-GS1

238–239 cm in depth

Organic sediment

− 26.77 ± 0.24

4783 ± 27

5590–5470 (95.4%)

 

15

IAAA-210369

SKN-GS1

243.5–244.5 cm in depth

Organic sediment

− 26.72 ± 0.19

4902 ± 27

5720–5680 (4.5%), 5670–5580 (90.9%)

 

16

IAAA-202305

SKN-GS2

64–65 cm in depth

Organic sediment

− 27.5 ± 0.21

1003 ± 21

960–900 (78.3%), 870–820 (15.2%), 810–800 (1.9%)

 

17

IAAA-202306

SKN-GS2

70–71 cm in depth

Organic sediment

− 27.32 ± 0.19

1239 ± 21

1270–1200 (40.0%), 1180–1070 (55.5%)

 

18

IAAA-211211

SKN-GS2

91–92 cm in depth

Organic sediment

− 27.6 ± 0.21

2560 ± 24

2760–2690 (72.7%), 2640–2610 (7.7%), 2590–2510 (15.0%)

 

19

IAAA-210652

SKN-GS2

142–143 cm in depth

Organic sediment

− 29.82 ± 0.23

4410 ± 26

5260–5250 (0.5%), 5240–5190 (3.7%), 5060–4860 (91.2%)

 

20

IAAA-200960

SKN-GS2

204–206 cm in depth

Organic sediment

− 27.37 ± 0.25

4979 ± 28

5860–5820 (5.0%), 5750–5600 (90.4%)

 

21

IAAA-211210

SKN-GS3

90–91 cm in depth

Organic sediment

− 26.76 ± 0.22

3268 ± 26

3570–3440 (90.2%), 3430–3400 (5.3%)

 

22

IAAA-211209

SKN-GS4

97–98 cm in depth

Organic sediment

− 27.1 ± 0.18

3405 ± 26

3820–3800 (1.0%), 3720–3570 (94.5%)

 

23

IAAA-210651

SKN-GS5

63–64 cm in depth

Organic sediment

− 27.1 ± 0.25

4005 ± 25

4530–4410 (95.4%)

 

24

IAAA-202304

SKN-GS5

171–172 cm in depth

Organic sediment

− 22.62 ± 0.19

6673 ± 29

7610–7470 (95.4%)

 

25

IAAA-210217

SKN-GS6

44–45 cm in depth

Organic sediment

− 28.52 ± 0.27

268 ± 21

430–370 (28.6%), 330–280 (62.3%), 170–150 (4.5%)

 

26

IAAA-210365

SKN-GS6

57–58 cm in depth

Organic sediment

− 28.87 ± 0.19

615 ± 21

650–550 (95.4%)

 

27

IAAA-211208

SKN-GS6

96–97 cm in depth

Organic sediment

− 25.6 ± 0.22

2782 ± 25

2960–2840 (81.4%), 2830–2780 (14.0%)

 

28

IAAA-210650

SKN-GS6

132–133 cm in depth

Organic sediment

− 27.9 ± 0.22

4160 ± 25

4830–4580 (95.4%)

 

29

IAAA-210366

SKN-GS6

134–135 cm in depth

Organic sediment

− 25.77 ± 0.18

4125 ± 25

4820–4750 (28.1%), 4730–4520 (67.3%)

 

30

IAAA-210646

SKN-GS6

151–152 cm in depth

Organic sediment

− 27.2 ± 0.23

4457 ± 26

5290–5160 (47.3%), 5140–4960 (48.1%)

 

31

IAAA-210218

SKN-GS6

165–166 cm in depth

Organic sediment

− 30.01 ± 0.20

4643 ± 28

5470–5310 (95.4%)

 

32

IAAA-210219

SKN-GS6

173–174 cm in depth

Organic sediment

− 27.84 ± 0.19

5102 ± 29

5920–5840 (36.2%), 5830–5740 (59.2%)

 

33

IAAA-210220

SKN-GS6

195–196 cm in depth

Organic sediment

− 28.69 ± 0.18

5099 ± 29

5920–5840 (35.7%), 5830–5740 (59.8%)

 

34

IAAA-210221

SKN-GS6

228.5–229.5 cm in depth

Organic sediment

− 29.06 ± 0.18

5211 ± 29

6110–6080 (5.5%), 6010–5900 (89.9%)

 

35

IAAA-200961

SKN-GS6

262–264 cm in depth

Organic sediment

− 26.88 ± 0.25

5524 ± 28

6400–6280 (95.4%)

 

36

IAAA-210643

SKN-GS7

40–41 cm in depth

Organic sediment

− 25.69 ± 0.21

555 ± 21

630–590 (36.7%), 560–520 (58.8%)

 

37

IAAA-210644

SKN-GS8

74–75 cm in depth

Organic sediment

− 26.9 ± 0.21

503 ± 21

550–500 (95.4%)

 

38

IAAA-210216

SKN-GS9

62–63 cm in depth

Organic sediment

− 27.8 ± 0.21

412 ± 22

520–450 (90.5%), 360–330 (4.9%)

 

39

IAAA-211206

SKN-GS9

118–119 cm in depth

Organic sediment

− 25.2 ± 0.22

3264 ± 25

3570–3440 (87.6%), 3430–3400 (7.8%)

 

40

IAAA-211207

SKN-GS9

165–166 cm in depth

Organic sediment

− 25.2 ± 0.21

3940 ± 26

4520–4480 (8.8%), 4450–4290 (85.3%), 4270–4250 (1.4%)

 

41

IAAA-210647

SKN-GS9

175–176 cm in depth

Organic sediment

− 27.9 ± 0.24

4017 ± 26

4570–4550 (1.2%), 4530–4410 (94.2%)

 

42

IAAA-210648

SKN-GS9

201–202 cm in depth

Organic sediment

− 29.5 ± 0.24

4350 ± 27

5030–5010 (1.3%), 4980–4850 (94.1%)

 

43

IAAA-181806

SKN-E

below U-2 drift pumice

Organic sediment

− 22.9 ± 0.21

4710 ± 30

5580–5500 (17.2%), 5490–5430 (23.9%), 5420–5320 (54.4%)

Hiramine et al. (in press)

44

IAAA-181607

SKN-E

below To-Cu ash

Organic sediment

− 24.6 ± 0.39

5180 ± 30

6000–5900 (95.4%)

Ishimura and Hiramine (2020)