Table 2 U/Th dating results from the Isotope Laboratory of the University of Minnesota.

From: Hydroclimate variability in the Caribbean during North Atlantic Heinrich cooling events (H8 and H9)

Sample Number

Depth from top (cm)

238U

232Th

230Th /232Th

δ234U*

230Th/238U

230Th Age (year)

230Th Age (year)

δ234UInitial

230Th Age (year BP)

(ppb)

(ppt)

(Atomic × 10–6)

(Measured)

(Activity)

(Uncorrected)

(Corrected)

(Corrected)

(Corrected )

MCS-6

0.55

128.4 ± 0.2

5654 ± 114

5 ± 0

300.0 ± 2.7

0.0134 ± 0.0003

1132 ± 23

143 ± 701

300 ± 3

73 ± 701

M1

10.2

317.2 ± 0.4

2429 ± 49

1646 ± 33

441.7 ± 1.8

0.7645 ± 0.0014

78,626 ± 245

78,482 ± 265

551 ± 2

78,411 ± 265

M43*

10.4

129.4 ± 0.1

909 ± 18

2011 ± 40

449.0 ± 1.4

0.8567 ± 0.0012

91,992 ± 239

91,863 ± 256

582 ± 2

91,792 ± 256

M44*

10.7

145.8 ± 0.1

566 ± 11

3644 ± 73

445.7 ± 1.4

0.8576 ± 0.0011

92,478 ± 233

92,407 ± 238

578 ± 2

92,336 ± 238

MCS-22

11.5

149.8 ± 0.3

6701 ± 135

306 ± 6

438.5 ± 2.6

0.8307 ± 0.0021

88,908 ± 419

88,071 ± 723

562 ± 3

88,001 ± 723

M2

12.1

138.3 ± 0.2

4046 ± 81

468 ± 9

451.2 ± 2.3

0.8306 ± 0.0018

87,663 ± 360

87,122 ± 523

577 ± 3

87,051 ± 523

MCS-21*

12.9

144.0 ± 0.2

8641 ± 173

234 ± 5

446.0 ± 2.4

0.8499 ± 0.0021

91,192 ± 416

90,079 ± 889

575 ± 3

90,009 ± 889

M3

13.7

141.0 ± 0.3

5057 ± 102

384 ± 8

451.0 ± 2.4

0.8359 ± 0.0028

88,496 ± 491

87,833 ± 677

578 ± 3

87,762 ± 677

MCS-20

14

133.5 ± 0.2

3412 ± 68

545 ± 11

448.4 ± 2.3

0.8453 ± 0.0017

90,233 ± 347

89,760 ± 480

578 ± 3

89,690 ± 480

M4*

14.8

122.4 ± 0.2

1667 ± 33

1062 ± 21

433.4 ± 1.8

0.8780 ± 0.0015

97,170 ± 323

96,917 ± 368

570 ± 2

96,846 ± 368

MCS-19*

15

135.2 ± 0.2

7891 ± 158

229 ± 5

430.7 ± 2.0

0.8107 ± 0.0016

86,529 ± 312

85,427 ± 839

548 ± 3

85,357 ± 839

M5*

15.8

135.6 ± 0.2

1837 ± 37

1463 ± 29

460.3 ± 2.0

1.2019 ± 0.0021

162,291 ± 766

162,062 ± 782

727 ± 3

161,991 ± 782

MCS-18*

16

127.1 ± 0.1

2583 ± 52

1355 ± 27

456.3 ± 1.4

1.6703 ± 0.0024

   

 > 500,000

M6

17.1

123.5 ± 0.1

971 ± 19

1868 ± 37

478.4 ± 1.5

0.8904 ± 0.0013

94,341 ± 260

94,200 ± 278

624 ± 2

94,129 ± 278

MCS-17*

17.5

156.8 ± 0.2

1109 ± 22

3602 ± 72

486.2 ± 1.5

1.5459 ± 0.0023

310,035 ± 2520

309,939 ± 2519

1166 ± 9

309,869 ± 2519

M7

18.5

117.4 ± 0.2

3564 ± 72

479 ± 10

471.7 ± 2.4

0.8821 ± 0.0022

93,721 ± 430

93,172 ± 577

613 ± 3

93,101 ± 577

MCS-16

18.8

139.9 ± 0.2

4132 ± 83

487 ± 10

467.9 ± 2.1

0.8727 ± 0.0016

92,612 ± 332

92,076 ± 502

607 ± 3

92,006 ± 502

M8

20.2

119.5 ± 0.2

1866 ± 37

961 ± 19

483.1 ± 2.2

0.9099 ± 0.0019

96,978 ± 389

96,699 ± 435

635 ± 3

96,628 ± 435

MCS-15

20.5

114.2 ± 0.1

1175 ± 24

1435 ± 29

460.2 ± 1.6

0.8956 ± 0.0013

97,134 ± 279

96,947 ± 308

605 ± 2

96,877 ± 308

M9

21.3

105.3 ± 0.1

173 ± 3

9287 ± 188

509.0 ± 1.5

0.9239 ± 0.0013

96,467 ± 259

96,438 ± 259

668 ± 2

96,367 ± 259

MCS-14

21.8

116.4 ± 0.1

2100 ± 42

822 ± 16

476.9 ± 1.8

0.8990 ± 0.0015

95,877 ± 310

95,553 ± 384

625 ± 3

95,483 ± 384

M10*

22.6

123.4 ± 0.3

6433 ± 129

297 ± 6

498.3 ± 3.0

0.9407 ± 0.0027

100,343 ± 560

99,425 ± 853

660 ± 4

99,354 ± 853

MCS-13

23

150.9 ± 0.2

3707 ± 74

612 ± 12

488.7 ± 2.1

0.9122 ± 0.0017

96,740 ± 354

96,304 ± 468

641 ± 3

96,234 ± 468

M11

24

125.9 ± 0.1

993 ± 20

1939 ± 39

518.9 ± 1.6

0.9281 ± 0.0013

96,094 ± 268

95,957 ± 285

680 ± 2

95,886 ± 285

MCS-12

24.1

143.4 ± 0.1

1771 ± 35

1227 ± 25

497.5 ± 1.5

0.9191 ± 0.0012

96,911 ± 255

96,693 ± 297

654 ± 2

96,623 ± 297

M12

25.1

138.5 ± 0.2

1098 ± 22

1898 ± 38

490.4 ± 1.9

0.9125 ± 0.0014

96,617 ± 304

96,476 ± 319

644 ± 3

96,405 ± 319

MCS-11

25.8

121.5 ± 0.1

3817 ± 76

472 ± 9

476.3 ± 1.8

0.8998 ± 0.0017

96,068 ± 336

95,504 ± 521

624 ± 3

95,434 ± 521

M13

26.1

118.0 ± 0.1

318 ± 6

5525 ± 112

471.1 ± 1.4

0.9043 ± 0.0015

97,370 ± 290

97,322 ± 292

620 ± 2

97,251 ± 292

M14

27.5

98.9 ± 0.1

1009 ± 20

1449 ± 29

468.8 ± 1.8

0.8963 ± 0.0014

96,307 ± 294

96,122 ± 321

615 ± 2

96,051 ± 321

M15

29.4

108.3 ± 0.1

618 ± 12

2567 ± 52

464.1 ± 1.7

0.8887 ± 0.0012

95,573 ± 264

95,470 ± 274

608 ± 2

95,399 ± 274

M16

30.8

95.0 ± 0.1

160 ± 3

8765 ± 178

463.9 ± 1.7

0.8976 ± 0.0013

97,057 ± 284

97,026 ± 284

610 ± 2

96,955 ± 284

MCS-10

31.5

103.8 ± 0.1

1640 ± 33

929 ± 19

457.1 ± 2.1

0.8902 ± 0.0016

96,583 ± 352

96,295 ± 406

600 ± 3

96,225 ± 406

M17

32.1

115.6 ± 0.3

7580 ± 152

224 ± 5

454.2 ± 2.7

0.8893 ± 0.0029

96,742 ± 560

95,540 ± 1014

595 ± 4

95,469 ± 1014

MCS-9*

33.4

103.1 ± 0.1

1884 ± 38

823 ± 17

452.3 ± 1.8

0.9124 ± 0.0015

100,859 ± 337

100,526 ± 410

601 ± 3

100,456 ± 410

M18

33.8

96.2 ± 0.2

2075 ± 42

684 ± 14

452.0 ± 2.5

0.8948 ± 0.0024

97,900 ± 487

97,506 ± 559

595 ± 3

97,435 ± 559

M19

35.5

91.8 ± 0.2

6700 ± 135

205 ± 4

459.4 ± 2.8

0.9084 ± 0.0027

99,354 ± 558

98,025 ± 1089

606 ± 4

97,954 ± 1089

MCS-8

36.4

102.1 ± 0.1

1683 ± 34

882 ± 18

444.1 ± 1.8

0.8815 ± 0.0015

96,566 ± 327

96,262 ± 390

583 ± 2

96,192 ± 390

M20

36.8

95.3 ± 0.2

1838 ± 37

760 ± 15

445.8 ± 2.6

0.8899 ± 0.0020

97,776 ± 448

97,422 ± 512

587 ± 4

97,351 ± 512

  1. *Refers to dating results that were not used in the age model. B.P. stands for “Before Present” where the “Present” is defined as the year 1950 A.D.
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