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Table 4. Results of the chemical analysis of gas-phase samples from borehole NDR-MF#1

[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
+/- (%)

12.5

870

-14.28

71

2,700

1.3

15.5

741

-13.81

73

2,500

2.5

18.6

884

-14.64

70

2,800

2.1

21.6

913

-14.79

64

3,600

1.4

24.7

743

-14.36

70

2,900

2.0

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