Extended Data Table 1 Dose rates, equivalent doses (De) and OSL ages for the Devils Canopy sediment samples based on minimum age model (MAM) solutions

From: Semi-continuous release of Cordilleran Ice Sheet meltwater between 20,000 and 17,000 years ago

Sample name

Water content1 (%)

Dose rate (Gy/ka)

Aliquots accepted/measured (n)

CAM De (Gy)

Over-dispersion (%)

MAM De (Gy)3

MAM Age (ka)4

Beta

Gamma

Cosmic

Total2

DCC1a

16.3

1.46 ± 0.07

0.76 ± 0.02

0.0008 ± 0.00

2.25 ± 0.10

28/96

70.2 ± 7.3

48 ± 8

39.0 ± 6.9

17.3 ± 3.0

DCC2

13.3

1.64 ± 0.07

0.80 ± 0.02

0.0009 ± 0.00

2.48 ± 0.11

19/48

59.9 ± 7.4

43 ± 10

40.1 ± 4.6

16.2 ± 2.0

DCC4

11.6

1.44 ± 0.06

0.66 ± 0.01

0.0009 ± 0.00

2.03 ± 0.09

44/144

58.8 ± 4.3

38 ± 6

40.6 ± 5.8

19.0 ± 2.9

  1. 1For age calculation the field water content as measured for each sample has been used and an absolute error of 2.4% was added (that is STDE of field water content for all samples).
  2. 2Contains in internal quartz dose rate of 0.032±0.01 Gy/ka.
  3. 3MAM 3-parameter model.
  4. 4Age uncertainties are reported on the 2 sigma level.
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