Table 10. Composition of headspace gases from Site 1039. "Notes: C1, C2, and C3 represent methane, ethane, and propane, respectively. ppmv = parts per million by volume." "Core, section, interval (cm)" Depth (mbsf) C1 (ppmv) C2 (ppmv) C3 (ppmv) 170-1039A- "1H-5, 0-5" 6.03 8 0 0 "2H-5, 0-5" 15.03 10 0 0 "3H-4, 0-5" 24.53 36 0 0 170-1039B- "4H-2, 145-150" 23.95 8 0 0 "5H-5, 0-5" 36.53 11 0 0 "6H-5, 0-5" 46.03 13 0 0 "7H-5, 0-5" 55.53 12 0 0 "8H-5, 0-5" 65.03 12 0 0 "9H-5, 0-5" 74.53 13 0 0 "10H-5, 0-5" 84.03 110 6 < 1 "11H-5, 0-5" 93.53 17 0 0 "12X-5, 0-5" 103.3 9 0 0 "13X-5, 0-5" 109.53 11 0 0 "14X-5, 0-5" 119.23 8 0 0 "15X-5, 0-5" 128.73 7 0 0 "16X-5, 0-5" 138.23 8 0 0 "17X-5, 0-5" 147.83 9 0 0 "18X-5, 0-5" 157.43 9 0 0 "19X-5, 0-5" 167.13 8 0 0 "20X-5, 0-5" 176.63 7 0 0 "21X-5, 0-5" 186.23 6 0 0 "22X-5, 0-5" 195.83 5 0 0 "23X-5, 0-5" 205.53 5 0 0 "24X-5, 0-5" 215.13 5 0 < 1 "25X-5, 0-5" 224.73 7 0 0 "26X-5, 0-5" 234.4 5 0 < 1 "27X-5, 0-5" 244.03 7 0 0 "28X-5, 0-5" 253.73 4 0 0 "29X-5, 0-5" 263.43 5 0 0 "30X-5, 0-5" 273.13 5 0 0 "31X-5, 0-5" 282.73 5 0 0 "32X-5, 0-5" 292.43 5 0 0 "33X-5, 0-5" 302.03 5 0 0 "35X-5, 0-5" 321.23 5 0 0 "36X-5, 0-5" 330.83 4 0 0 "37X-5, 0-5" 340.43 4 0 0 "38X-5, 0-5" 350.03 4 0 0 "39X-5, 0-5" 359.63 3 0 0 "40X-5, 0-5" 369.23 3 0 0 "41X-3, 0-5" 375.82 5 0 0 170-1039C- "1R-1, 0-5" 364.13 4 0 0 "2R-2, 0-5" 372.73 3 0 0 "3R-2, 0-5" 383.83 4 0 0 "5R-2, 145-150" 402.98 3 0 0