Table 2 Dose rate data for OSL age calculation

From: Fraser Island (K'gari) and initiation of the Great Barrier Reef linked by Middle Pleistocene sea-level change

Map code

Lab code

Depth (m)

In situ H2O (%)a

K (%)b

Rb (ppm)b

Th (ppm)b

U (ppm)b

Cosmicc (Gy ka–1)

Dune package 1

RB7f

USU-2256

40

5.1

0.04

2.8

1.3

0.3

0.01

RB12f

USU-2261

90

2.3

0.01

0.6

2.0

0.5

0

RB5f

USU-2013

22

2.6

0.01

0.4

0.9

0.3

0.03

RB10f

USU-2259

14

2.8

0.01

0.2

1.4

0.4

0.04

Dune package 2

RB1

USU-2004

125

6.2

0.13

6.7

2.6

0.6

0

RB2

USU-2005

95

12.5

0.13

8.2

3.0

0.4

0

RB9

USU-2258

40

0.5

0.05

3.0

1.1

0.3

0.01

RB6f

USU-2014

16

4.8

0.05

3.2

1.1

0.3

0.04

RB8

USU-2257

40

3.1

0.05

2.8

1.4

0.3

0.01

RB11

USU-2260

12

4.0

0.05

3.0

1.2

0.3

0.05

RB13

USU-2262

15

3.1

0.06

4.3

1.6

0.3

0.04

Dune package 3

RB14

USU-2264d

50

4.0

0.08

4.3

5.8

0.6

0.01

RB16

USU-2015e

46

3.3

0.03

1.4

2.6

0.4

0.01

RB15

USU-2009

42

3.2

0.02

1.3

0.4

0.2

0.01

Dune package 4

RB19

USU-2008

37

3.6

0.14

6.1

1.0

0.2

0.01

RB18

USU-2007

32

4.0

0.17

7.7

1.4

0.3

0.02

RB17

USU-2263

20

6.5

0.07

3.1

8.1

1.1

0.03

Dune package 5

RB20

USU-2017

25

2.4

0.03

1.9

0.9

0.2

0.02

RB21

USU-2016

27

3.6

0.01

0.7

1.3

0.3

0.02

Fraser Island

SRG4

USU-2391

43

2.1

0.10

6.4

1.8

0.4

0.01

SRG3

USU-2392

36

4.6

0.04

2.5

1.0

0.3

0.01

SRG2

USU-2393

29

6.7

0.05

3.2

1.3

0.3

0.02

SRG1

USU-2394

9

6.3

0.05

3.4

1.4

0.3

0.07

  1. Geochemistry, water-content and sample-depth information used for external dose rate calculation. See Extended Data Table 1 for internal geochemistry.
  2. a7 ± 2% wt% water content assumed for all samples with <7% moisture content due to outcrop drying effects.
  3. bRadio-elemental concentrations determined by ICP-MS and ICP-AES techniques. Detection limits are 0.01% K, 0.1 ppm Rb, 0.01 ppm Th and 0.1 ppm U. Measured uncertainties are expected to be 10%.
  4. cContribution of cosmic radiation to the dose rate was calculated by using sample depth, elevation (Table 1) and longitude/latitude (29.9° W, 153.1° N) following Prescott and Hutton54.
  5. dDose rate calculation uses a combination of B (USU-2264) and C (USU-2007-2008) soil horizon chemistry.
  6. eDose rate calculation uses a combination of E (USU-2015) and B (USU-2264) soil horizon chemistry.
  7. fSamples are stratigraphically near reversed palaeomagnetic samples
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