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Table 5. Results of the chemical analysis of gas-phase samples from borehole NDR-MF#2

[ ppm, parts per million; , parts per thousand; pmc, percent modern carbon; %, percent]

Depth
(meters)

CO2
(ppm)

13C
()
(standard is PDB)

14C
(pmc)

14C age
(years)

14C age
+/- (%)

12.2

736

-13.45

72

2,600

0.8

15.2

711

-13.52

73

2,600

1.6

18.3

777

-14.12

65

3,500

1.4

21.3

836

-15.04

72

2,600

1.9

24.4

896

-14.98

65

3,500

0.7

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