Initial Reports, Volume 201 Shipboard Scientific Party Chapter 12, Table T6. Hydrogen concentrations, Hole 1231B. Core, section, interval (cm) Depth (mbsf) Hydrogen (nM) Incubation temperature (degrees C) 201-1231B- 1H-2, 85-91 2.35 49.1 4 2H-2, 85-91 5.75 28.58 4 3H-2, 65-71 15.05 102.3 4 4H-2, 50-56 24.4 61.66 4 5H-2, 50-56 33.9 6.62 4 6H-2, 90-96 43.8 0.05 4 7H-2, 50-56 52.9 0.07 4 8H-2, 35-41 62.25 0.13 4 9H-2, 55-61 71.95 0.05 4 10H-2, 50-56 81.4 0.22 4 11H-5, 105-111 95.95 0.18 4 12H-2, 80-86 100.7 0.04 4 13H-3, 50-56 112.9 0.13 4