Figure F3. A. Representative gas chromatogram for PLFA analyses (Sample 205-1254A-11R-5, 103–108 cm; 326.1 mbsf). Dominant PLFA peaks for this sample include 14:0 (tetradecanoic acid, retention time = 20.20), alpha15:0 (anteiso branching pentadecanoic acid, retention time = 22.10), 15:0 (pentadecanoic acid, retention time = 22.86), 16:0 (hexadecanoic acid, retention time = 25.64), 17:0 (heptadecanoic acid, retention time = 28.46), and 18:0 (octadecanoic acid, retention time = 31.26). The presence of these PLFAs indicates the presence Gram-positive bacteria. B. Ion chromatogram of m/z 74 (Sample 205-1254A-11R-5, 103–108 cm), labeled for FAME and other constituents. Unknown FAMEs are labeled as "UF," and peaks related to siloxane contamination are also indicated. IS = international standard. TIC = total iron chromatogram.

Figure F3. A. Representative gas chromatogram for PLFA analyses (Sample 205-1254A-11R-5, 103–108 cm; 326.1 mbsf). Dominant PLFA peaks for this sample include 14:0 (tetradecanoic acid, retention time = 20.20),

15:0 (anteiso branching pentadecanoic acid, retention time = 22.10), 15:0 (pentadecanoic acid, retention time = 22.86), 16:0 (hexadecanoic acid, retention time = 25.64), 17:0 (heptadecanoic acid, retention time = 28.46), and 18:0 (octadecanoic acid, retention time = 31.26). The presence of these PLFAs indicates the presence Gram-positive bacteria. B. Ion chromatogram of m/z 74 (Sample 205-1254A-11R-5, 103–108 cm), labeled for FAME and other constituents. Unknown FAMEs are labeled as "UF," and peaks related to siloxane contamination are also indicated. IS = internal standard.