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Table 1 Samples used, biostratigraphic tie points, and related sedimentation rates at IODP Site U1425 (cm/ky)

From: Paleoceanographic history of the Japan Sea over the last 9.5 million years inferred from radiolarian assemblages (IODP Expedition 346 Sites U1425 and U1430)

Exp

Site

Hole

Core

Type

Sect

A/W

Offset (cm) Mid

CCSF-A (m) (Tada et al. 2015a)

CCSF-D_Patched (Irino et al. 2018)

Age (Ma)

Sedimentation rates (cm/ky)

Comments

346

U1425

D

1

H

1

W

13

0.130

0.13

0.002

  

346

U1425

D

1

H

1

W

103

1.030

1.03

0.017

  

346

U1425

D

1

H

3

W

3

3.030

3.03

0.051

  

Tie point of Tada et al. (2018)

6.22

0.105

5.924

We used the Tephra & Pmag age of Dark layer No. 1–6 (Additional file 3)

346

U1425

B

1

H

5

W

99

6.992

6.99

0.121

  

346

U1425

D

2

H

2

W

14

8.005

8.00

0.143

  

346

U1425

D

2

H

3

W

64

10.005

10.00

0.185

  

Tie point of Tada et al. (2018)

10.55

0.197

4.707

We used the Tephra & Pmag age of Dark layer No. 2–5 (Addional file 3)

Tie point of Tada et al. (2018)

14.13

0.292

3.776

We used the Tephra & Pmag age of Dark layer No. 3–2 (Additional file 3)

346

U1425

B

2

H

5

W

65

16.006

16.01

0.342

  

Tie point of Tada et al. (2018)

17.66

0.386

3.735

We used the Tephra & Pmag age of Dark layer No. 4–2 (Additional file 3)

Tie point of Tada et al. (2018)

21.71

0.483

4.188

We used the Tephra & Pmag age of Dark layer No. 5–3 (Additional file 3)

346

U1425

D

3

H

5

W

42

22.012

22.01

0.493

  

346

U1425

B

3

H

4

W

52

24.904

24.90

0.589

  

Tie point of Tada et al. (2018)

25.46

0.608

3.002

We used the Tephra & Pmag age of Dark layer No. 6–3 (Additional file 3)

346

U1425

B

3

H

5

W

113

27.014

27.01

0.647

  

Tie point of Tada et al. (2018)

29.18

0.700

4.026

We used the Tephra & Pmag age of Dark layer No. 7–2 (Additional file 3)

346

U1425

D

4

H

3

W

28

30.008

30.01

0.720

  

346

U1425

D

4

H

5

W

28

33.008

33.01

0.790

  

Tie point of Tada et al. (2018)

33.21

0.795

4.251

We used the Tephra & Pmag age of Dark layer No. 9–1 (Additional file 3)

346

U1425

D

4

H

7

W

8

35.808

35.81

0.855

  

Tie point of Tada et al. (2018)

38.16

0.909

4.346

We used the Tephra & Pmag age of Dark layer No. 11–1 (Additional file 3)

346

U1425

B

4

H

7

W

32

39.034

39.23

0.937

  

346

U1425

D

5

H

3

W

15

40.016

40.21

0.962

  

Tie point of Tada et al. (2018)

41.75

1.002

3.869

We used the Tephra & Pmag age of Dark layer No. 13–3 (Additional file 3)

346

U1425

D

5

H

5

W

15

43.016

43.21

1.050

  

Tie point of Tada et al. (2018)

44.97

1.109

3.001

We used the Tephra & Pmag age of Dark layer No. 15–2 (Additional file 3)

346

U1425

D

5

H

6

W

65

45.016

45.21

1.116

  

346

U1425

B

5

H

5

W

32

46.026

46.32

1.146

  

Tie point of Tada et al. (2018)

47.98

1.192

3.635

We used the Tephra & Pmag age of Dark layer No. 17–1 (Additional file 3)

346

U1425

B

5

H

6

W

82

48.026

48.32

1.204

  

346

U1425

D

6

H

3

W

134

50.990

51.28

1.306

  

Tie point of Tada et al. (2018)

51.43

1.311

2.892

We used the Tephra & Pmag age of Dark layer No. 19–1 (Additional file 3)

346

U1425

B

6

H

2

W

62

53.017

53.31

1.391

  

Tie point of Tada et al. (2018)

54.8

1.455

2.344

We used the Tephra & Pmag age of Dark layer No. 21–2 (Additional file 3)

346

U1425

B

6

H

3

W

112

55.017

55.31

1.468

  

346

U1425

B

6

H

5

W

12

57.017

57.31

1.517

  

346

U1425

D

7

H

2

W

82

60.013

60.30

1.592

  

Tie point of Kamikuri et al. (2017)

64.115

64.63

1.700

4.013

We used the Last Occurrence of A. acquilonium (Radiolaria), which occurred at the mid depth of 64,115 m CCSF-A. This bioevent has no error margin.

346

U1425

D

7

H

5

W

132

65.013

65.30

1.750

  

346

U1425

B

7

H

5

W

104

68.016

68.31

1.972

  

346

U1425

D

8

H

2

W

99

69.996

70.29

2.119

  

346

U1425

D

8

H

4

W

143

73.006

73.30

2.342

  

346

U1425

B

8

H

3

W

138

76.007

76.30

2.564

  

346

U1425

B

8

H

5

W

138

79.007

79.30

2.787

  

Tie point of Kamikuri et al. (2017)

80.005

80.62

2.885

1.350

We used the Last Occurrence of H. parviakitaense (Radiolaria), which occurred at the mid depth of 80,005 m CCSF-A. This bioevent has an error margin of 0,015 Ma.

346

U1425

B

8

H

7

W

39

81.017

81.57

2.905

  

346

U1425

B

9

H

3

W

5

85.002

85.55

2.992

  

346

U1425

B

9

H

4

W

55

87.002

87.55

3.035

  

346

U1425

D

10

H

2

W

65

88.007

88.56

3.057

  

346

U1425

D

10

H

4

W

65

91.007

91.56

3.122

  

346

U1425

D

10

H

6

W

66

94.017

93.75

3.170

  

346

U1425

B

10

H

5

W

94

96.013

95.74

3.213

  

346

U1425

D

11

H

3

W

133

99.003

98.73

3.278

  

346

U1425

D

11

H

5

W

133

102.003

101.73

3.343

  

346

U1425

B

11

H

5

W

62

106.008

105.74

3.430

  

346

U1425

D

12

H

3

W

75

109.005

108.73

3.495

  

346

U1425

D

13

X

2

W

71

112.011

111.86

3.563

  

346

U1425

B

14

H

3

W

59

115.014

114.86

3.628

  

346

U1425

B

14

H

5

W

56

118.014

117.86

3.694

  

346

U1425

B

14

H

6

W

106

120.014

119.86

3.737

  

346

U1425

D

14

H

2

W

59

122.009

121.86

3.780

  

346

U1425

D

14

H

3

W

109

124.009

123.86

3.824

  

346

U1425

B

17

H

2

W

124

125.003

124.85

3.845

  

346

U1425

D

15

H

3

W

23

127.011

126.86

3.889

  

346

U1425

D

15

H

4

W

73

129.011

128.86

3.932

  

346

U1425

D

15

H

6

W

73

132.011

131.86

3.997

  

Tie point of Kamikuri et al. (2017)

134.43

134.28

4.050

4.606

We used the Last Occurrence of D. bullatus (Radiolaria), which occurred at the mid depth of 134.43 m CCSF-A. This bioevent has an error margin of 0.25 Ma.

346

U1425

D

16

H

2

W

4

136.013

135.86

4.089

  

346

U1425

D

16

H

4

W

2

139.013

138.86

4.164

  

346

U1425

D

16

H

6

W

2

142.013

141.86

4.238

  

346

U1425

B

21

H

2

W

21

144.030

143.88

4.289

  

346

U1425

B

21

H

4

W

20

147.020

146.87

4.363

  

Tie point of Kamikuri et al. (2017)

148.51

148.36

4.400

4.023

We used the First Occurrence of D. bullatus (Radiolaria), which occurred at the mid depth of 148.51 m CCSF-A. This bioevent has an error margin of 0.1 Ma.

346

U1425

B

21

H

6

W

20

150.020

149.87

4.480

  

346

U1425

D

18

H

5

W

7

151.996

151.84

4.584

  

346

U1425

D

18

H

6

W

60

154.026

153.87

4.691

  

346

U1425

B

22

H

3

W

111

156.990

156.84

4.848

  

346

U1425

B

22

H

5

W

11

158.990

158.84

4.954

  

Tie point of Kamikuri et al. (2017)

160.815

160.66

5.050

1.893

We used the Last Occurrence of L. redondoensis (Radiolaria), which occurred at the mid depth of 160,815 m CCSF-A. This bioevent has an error margin of 0.05 Ma.

346

U1425

D

19

H

3

W

127

161.021

160.87

5.054

  

346

U1425

D

19

H

5

W

128

164.031

163.88

5.111

  

346

U1425

B

23

H

3

W

130

167.020

166.87

5.167

  

346

U1425

B

23

H

5

W

130

170.020

169.87

5.224

  

346

U1425

D

20

H

4

W

97

172.014

171.86

5.262

  

346

U1425

D

20

H

5

W

146

174.004

173.85

5.299

  

346

U1425

B

24

H

2

W

145

176.002

175.85

5.337

  

346

U1425

D

21

H

2

W

37

178.013

177.86

5.375

  

346

U1425

D

21

H

3

W

87

180.013

179.86

5.413

  

346

U1425

D

21

H

5

W

87

183.013

182.86

5.470

  

346

U1425

B

25

H

2

W

91

185.001

184.85

5.507

  

346

U1425

B

25

H

4

W

92

188.011

187.86

5.564

  

346

U1425

D

22

H

5

W

62

193.011

192.86

5.659

  

346

U1425

D

22

H

6

W

112

195.011

194.86

5.696

  

346

U1425

D

23

H

2

W

77

198.007

197.86

5.753

  

346

U1425

D

23

H

4

W

77

201.007

200.86

5.810

  

346

U1425

D

23

H

6

W

77

204.007

203.86

5.867

  

346

U1425

B

27

H

4

W

28

207.014

206.86

5.923

  

346

U1425

B

27

H

6

W

27

210.004

209.85

5.980

  

346

U1425

D

24

H

5

W

6

212.008

211.86

6.018

  

346

U1425

D

24

H

6

W

56

214.008

213.86

6.056

  

346

U1425

B

28

H

3

W

148

217.010

216.86

6.112

  

Tie point of Kamikuri et al. (2017)

219

218.85

6.150

5.290

We used the Last Occurrence of L. parallelipes (Radiolaria), which occurred at the mid depth of 219.00 m CCSF-A. This bioevent has an error margin of 0.25 Ma.

346

U1425

B

29

H

1

W

82

222.021

221.99

6.267

  

346

U1425

B

29

H

3

W

82

225.021

224.99

6.378

  

346

U1425

B

29

H

5

W

83

228.031

228.00

6.489

  

346

U1425

D

27

H

1

W

123

231.023

231.00

6.600

  

346

U1425

B

30

H

3

W

32

233.012

234.23

6.720

  

346

U1425

B

30

H

5

W

32

236.012

237.23

6.831

  

Tie point of Kamikuri et al. (2017)

237.66

239.09

6.900

2.699

We used the Rapid Increase of L. barbatus (Radiolaria), which occurred at the mid depth of 237.66 m CCSF-A. This bioevent has an error margin of 0.10 Ma.

346

U1425

D

28

H

4

W

90

238.009

239.23

6.903

  

346

U1425

D

28

H

6

W

90

241.009

242.23

6.968

  

346

U1425

D

29

H

1

W

46

243.011

244.23

7.012

  

346

U1425

D

29

H

2

W

96

245.011

246.23

7.055

  

346

U1425

B

33

H

3

W

40

247.002

248.22

7.099

  

346

U1425

B

33

H

4

W

90

249.002

250.22

7.142

  

346

U1425

B

33

H

5

W

139

250.992

252.21

7.186

  

346

U1425

B

33

H

6

W

91

252.012

253.23

7.208

  

346

U1425

D

30

H

5

W

76

255.009

256.23

7.273

  

Tie point of Kamikuri et al. (2017)

255.58

257.46

7.300

4.593

We used the First Occurrence of L. barbatus (Radiolaria), which occurred at the mid depth of 255.58 m CCSF-A. This bioevent has an error margin of 0.10 Ma.

346

U1425

B

34

H

4

W

47

258.010

259.23

7.342

  

346

U1425

B

34

H

5

W

97

260.010

262.23

7.413

  

346

U1425

D

31

H

2

W

118

261.012

265.23

7.484

  

346

U1425

D

31

H

4

W

118

264.012

267.23

7.531

  

346

U1425

B

35

H

3

W

48

266.008

268.23

7.555

  

346

U1425

B

35

H

3

W

148

267.008

270.23

7.602

  

346

U1425

B

35

H

5

W

48

269.008

274.23

7.697

  

346

U1425

D

32

H

4

W

6

273.007

275.23

7.720

  

346

U1425

D

32

H

4

W

106

274.007

277.23

7.768

  

346

U1425

D

32

H

6

W

6

276.007

280.23

7.839

  

346

U1425

B

37

H

1

W

129

279.011

281.24

7.863

  

346

U1425

B

37

H

2

W

80

280.021

281.26

7.863

  

346

U1425

D

33

H

4

W

3

282.014

283.23

7.910

  

346

U1425

B

38

H

1

W

102

283.006

284.22

7.933

  

346

U1425

D

35

H

2

W

48

287.003

288.22

8.028

  

346

U1425

B

39

H

2

W

126

290.011

291.23

8.099

  

346

U1425

B

39

H

4

W

61

291.991

293.21

8.146

  

346

U1425

B

40

X

2

W

59

293.998

294.22

8.170

  

346

U1425

B

40

X

3

W

10

295.008

296.22

8.217

  

346

U1425

D

37

H

1

W

144

297.010

298.36

8.268

  

346

U1425

D

37

H

2

W

94

298.010

299.36

8.292

  

346

U1425

D

37

H

4

W

95

300.010

301.36

8.339

  

346

U1425

D

37

H

5

W

45

301.010

302.36

8.363

  

346

U1425

B

42

H

3

W

67

306.015

307.36

8.481

  

346

U1425

D

38

H

2

W

127

307.006

308.35

8.505

  

346

U1425

D

39

H

1

W

57

310.003

311.35

8.576

  

346

U1425

D

39

H

2

W

107

312.003

313.35

8.623

  

346

U1425

D

39

H

3

W

57

313.003

314.35

8.647

  

346

U1425

B

44

H

2

W

77

314.012

315.36

8.670

  

346

U1425

B

44

H

4

W

5

316.012

317.36

8.718

  

346

U1425

D

40

H

2

W

60

318.013

319.36

8.765

  

346

U1425

D

40

H

3

W

10

319.013

320.36

8.789

  

346

U1425

D

40

H

3

W

110

320.013

321.36

8.812

  

346

U1425

B

46

H

1

W

53

321.027

321.85

8.824

  

346

U1425

D

41

H

2

W

109

323.018

323.85

8.871

  

346

U1425

D

41

H

4

W

37

325.008

325.84

8.918

  

346

U1425

B

47

H

1

W

92

326.016

326.84

8.942

  

346

U1425

B

47

H

2

W

42

327.016

327.84

8.966

  

346

U1425

B

47

H

2

W

143

328.026

328.85

8.990

  

346

U1425

B

47

H

3

W

92

329.016

329.84

9.013

  

346

U1425

D

43

H

2

W

28

331.016

331.84

9.061

  

Tie point of Kamikuri et al. (2017)

332.68

333.51

9.100

4.225

We used the First Occurrence of L. barbatus (Radiolaria), which occurred at the mid depth of 255.58 m CCSF-A. This bioevent has no an error margin.

346

U1425

D

43

H

3

W

78

333.016

333.84

9.106

  

346

U1425

D

43

H

4

W

28

334.016

334.84

9.123

  

346

U1425

D

43

H

4

W

128

335.016

335.84

9.140

  

346

U1425

D

43

H

6

W

28

337.016

337.84

9.173

  

346

U1425

B

49

H

2

W

30

338.016

338.84

9.190

  

346

U1425

B

49

H

2

W

130

339.016

339.84

9.207

  

346

U1425

D

44

H

2

W

31

341.014

341.84

9.241

  

346

U1425

B

50

H

2

W

67

343.994

344.82

9.291

  

346

U1425

B

50

H

3

W

118

346.004

346.83

9.325

  

346

U1425

D

45

H

2

W

41

347.010

347.84

9.342

  

346

U1425

D

45

H

2

W

141

348.010

348.84

9.359

  

346

U1425

D

46

H

1

W

76

349.73

350.56

9.393

  

346

U1425

D

46

H

2

W

76

351.23

352.06

9.423

  

346

U1425

D

46

H

4

W

4

353.23

354.06

9.462

  

346

U1425

D

48

H

1

W

26

358.63

359.46

9.568

  

Tie point of Kamikuri et al. (2017)

382.925

383.75

9.950

5.911

We used the First Occurrence of C. nakasekoi (Radiolaria), which occurred at the mid depth of 382.925 m CCSF-A. This bioevent has an error margin of 0.25 Ma.