"Table 4. Composition of headspace gases from Holes 1003A, 1003B, and 1003C." Site H Core Type Section Depth C1 C2 C3 i C4 n C4 i C5 n C5 i C6 n C6 C1/C2 C1/C2 + mbsf ppm-v 1003 A 1 H 3 3 2 1003 A 2 H 3 10 2 1003 A 3 H 6 24 2 1003 A 4 H 3 28.91 3 1003 A 5 H 6 43 3 1003 A 6 H 6 52.5 5 1003 A 7 H 6 61.6 11 1003 A 8 H 6 71.5 41 1 41 41 1003 A 9 H 1 73.5 57 2 29 29 1003 A 11 X 3 87.8 117 4 29 29 1003 A 12 X 3 94.9 130 3 43 43 1003 A 13 X 5 107.6 166 4 42 42 1003 A 14 X 6 118.6 206 5 41 41 1003 A 15 X 4 125.2 172 4 43 43 1003 A 17 X 5 145.9 181 4 45 45 1003 A 18 X 4 154.1 208 5 42 42 1003 A 19 X 2 160.7 142 4 36 36 1003 A 22 H 6 195.6 181 4 45 45 1003 B 20 X 5 181.6 248 5 50 50 1003 B 21 X 6 192.8 193 4 48 48 1003 B 22 X 4 199.5 225 4 56 56 1003 B 23 X 3 207.7 355 8 44 44 1003 B 24 X 4 218.8 273 6 46 46 1003 B 29 X 1 262.5 35 1 35 35 1003 B 31 X 2 283.3 201 4 50 50 1003 B 32 X 2 292.9 195 4 49 49 1003 B 34 X 1 310.6 131 3 44 44 1003 B 35 X 2 321.7 300 5 60 60 1003 B 36 X 3 332.9 361 7 52 52 1003 B 38 X 2 350.5 364 6 61 61 1003 B 39 X 1 358.6 29 1 29 29 1003 B 40 X 1 368.2 49 1 49 49 1003 B 41 X CC 377.9 27 1 27 27 1003 B 42 X 1 387.5 39 1 39 39 1003 B 43 X CC 397.1 19 0 48 48 1003 B 44 X 1 406.8 47 1 47 47 1003 B 45 X 1 416.4 63 1 63 63 1003 B 46 X CC 426.1 61 2 31 31 1003 B 47 X CC 435.7 76 3 25 25 1003 B 48 X CC 446.38 303 6 51 51 1003 B 49 X 1 454.9 150 4 38 38 1003 B 50 X 2 466.1 135 3 45 45 1003 B 51 X 1 474.2 257 6 43 43 1003 B 52 X CC 483.9 118 3 39 39 1003 B 54 X 2 503.95 127 3 42 42 1003 B 55 X 1 512.7 192 5 1 38 32 1003 B 57 X 1 532 63 2 32 32 1003 C 1 R 1 406 155 7 22 22 1003 C 2 R 1 415.6 440 9 49 49 1003 C 3 R 1 473.5 57 3 19 19 1003 C 4 R 2 484.6 130 3 43 43 1003 C 5 R 2 494.2 57 2 29 29 1003 C 6 R 3 505.11 80 2 40 40 1003 C 7 R 1 511.9 12 1003 C 8 R 2 522.85 28 1 28 28 1003 C 9 R 2 531.68 27 1 27 27 1003 C 10 R 1 540.1 110 3 1 37 28 1003 C 11 R 1 549.7 3 1003 C 12 R 1 559.3 49 1 49 49 1003 C 13 R 2 570.4 21 1 21 21 1003 C 14 R 1 578.6 17 1 17 17 1003 C 15 R 2 589.78 8 1003 C 16 R 1 597.9 80 3 1 27 20 1003 C 17 R 1 607.5 52 2 26 26 1003 C 18 R 3 621.44 13 1 13 13 1003 C 19 R 2 628.2 16 1 16 16 1003 C 20 R 2 637.59 14 1 14 14 1003 C 21 R 1 647.45 7 1 7 7 1003 C 22 R 3 658.3 4 1003 C 24 R 1 674.9 6 0 15 15 1003 C 25 R 2 686 9 1 18 18 1003 C 26 R 2 695.54 22 2 11 11 1003 C 27 R 1 703.6 3 1003 C 30 R 3 735.3 327 22 29 9 11 12 7 4 4 15 3 1003 C 31 R 2 743.41 115 5 6 2 6 6 3 1 2 23 4 1003 C 32 R 2 752.59 219 10 12 8 12 12 8 4 6 22 3 1003 C 33 R 2 762.7 124 6 9 6 11 13 6 1 2 21 2 1003 C 34 R 3 773.58 275 12 15 13 17 20 10 3 5 23 3 1003 C 35 R 7 788.13 576 26 28 20 33 26 12 2 4 22 4 1003 C 36 R 6 797.35 276 19 26 21 30 22 10 1 3 15 2 1003 C 37 R 1 799.8 393 21 27 19 32 26 12 4 2 19 3 1003 C 38 R 5 815.04 150 6 7 4 7 6 3 2 2 25 4 1003 C 39 R 1 820.2 388 26 36 27 43 35 17 5 8 15 2 1003 C 40 R 4 833.1 563 47 94 31 43 52 49 78 104 12 1 1003 C 41 R 3 841.96 297 38 95 26 35 52 55 82 113 8 1 1003 C 42 R 5 853.05 378 16 18 12 15 16 11 17 26 24 3 1003 C 43 R 1 857.5 378 18 19 14 19 18 8 4 7 21 4 1003 C 44 R 4 871.56 101 5 5 3 5 5 2 1 20 4 1003 C 45 R 4 881.04 357 20 20 22 23 29 12 2 5 18 3 1003 C 46 R 4 890.3 665 38 23 35 14 26 8 3 6 18 4 Site H Core T Sec Depth C1 C2 C3 i C4 n C4 i C5 n C5 i C6 n C6 C1/C2 C1/C2 + mbsf ppm-v 1003 C 47 R 1 896 133 7 3 5 2 4 1 1 19 6 1003 C 48 R 5 910.27 633 45 16 54 6 49 6 7 12 14 3 1003 C 49 R 1 915.2 40 2 1 2 1 2 1 1 1 20 4 1003 C 50 R 2 926.3 219 18 11 20 7 26 5 3 4 12 2 1003 C 51 R 1 934.5 32 2 1 1 1 1 1 1 1 16 4 1003 C 52 R 1 944.1 125 8 4 4 2 5 2 0 1 16 5 1003 C 53 R 1 953.7 70 3 1 0 1 2 0 0 23 9 1003 C 54 R 1 963.4 415 42 22 32 18 35 12 2 3 10 3 1003 C 55 R 2 974.5 830 90 51 59 43 71 23 4 9 9 2 1003 C 56 R 2 984.1 59 4 4 2 4 5 3 0 1 15 3 1003 C 57 R 2 993.7 480 40 32 18 29 30 13 2 4 12 3 1003 C 58 R 2 1003.28 622 42 35 24 34 40 16 3 7 15 3 1003 C 59 R 3 1014.15 159 8 6 3 4 5 2 1 1 20 5 1003 C 60 R 3 1024.08 1574 120 100 44 59 68 25 5 9 13 4 1003 C 61 R 2 1033.55 1325 72 48 21 27 34 12 3 4 18 6 1003 C 62 R 2 1042.83 700 34 17 12 8 10 4 1 1 21 8 1003 C 63 R 2 1051.43 378 17 9 6 4 5 2 0 1 22 9 1003 C 64 R 3 1062.55 1385 123 98 37 43 48 16 3 4 11 4 1003 C 65 R 2 1070.69 276 23 16 7 7 10 3 1 1 12 4 1003 C 66 R 4 1083.59 1427 109 70 24 26 31 10 2 5 13 5 1003 C 67 R 8 1097.76 544 29 12 4 4 6 2 0 1 19 9 1003 C 68 R 6 1104.66 1963 124 65 19 20 23 7 1 1 16 8 1003 C 69 R 2 1109.3 841 34 10 2 3 3 1 0 0 25 16 1003 C 70 R 5 1122.6 692 48 26 10 11 15 5 1 1 14 6 1003 C 71 R 2 1128.5 1008 62 35 14 13 19 5 1 2 16 7 1003 C 72 R 4 1140.4 1078 111 89 41 39 54 14 4 4 10 3 1003 C 73 R 2 1147.45 1070 113 91 38 41 54 15 4 4 9 3 1003 C 74 R 2 1157.5 532 26 10 6 4 5 1 1 1 20 10 1003 C 75 R 1 1166.5 537 34 18 11 7 8 2 1 1 16 7 1003 C 76 R 8 1184.18 402 37 22 9 10 14 4 1 1 11 4 1003 C 77 R 3 1187.9 519 43 24 9 10 12 4 1 1 12 5 1003 C 78 R 1 1194.5 342 28 17 10 7 10 3 1 1 12 4 1003 C 79 R 7 1211.98 675 45 20 7 7 10 3 1 1 15 7 1003 C 80 R 3 1216.52 398 31 19 8 8 13 4 1 1 13 5 1003 C 81 R 4 1227.35 217 20 16 8 7 11 3 1 1 11 3 1003 C 82 R 3 1236.5 872 79 52 20 16 25 6 2 1 11 4 1003 C 83 R 3 1245.37 579 60 40 13 12 19 4 1 1 10 4 1003 C 84 R 4 1257.24 414 33 20 16 5 9 2 1 1 13 5 1003 C 85 R 6 1268.62 231 29 22 7 6 10 2 1 0 8 3 1003 C 86 R 6 1278.71 648 77 56 20 15 36 6 2 2 8 3 1003 C 87 R 6 1287.8 124 16 10 3 3 6 2 1 0 8 3 1003 C 88 R 4 1296.38 466 67 50 22 15 33 7 3 2 7 2 "Notes: Below 735.3 mbsf, gas analysis was performed using the NGA. C1 through C6 headings represent the" "alkanes: methane, ethane, propane, butane, pentane, and hexane. Iso and normal configurations of" "butane, pentane, and hexane are designated with I and n prefixes, respectively. C1/C2 is the" "methane/ethane ratio, C1/C2+ is the methane/(C2 to C6) ratio."