Table 2. Methane Index (MI) and Branched/Isoprenoid Tetraether (BIT) index at sites U1357 (Adélie Basin site) and U1359 (margin site).

	Site U1357 (mbsf)							Site U1359 (mbsf)
mbsf	2.55	5.95	7.15	14.25	15.36	17.25	18.87	0.25	5.00	9.50
Index
MI	0.08	0.08	0.07	0.08	0.06	0.08	0.11	0.13	0.14	0.09
BIT	0.01	0.03	0.02	0.02	0.03	0.02	0.02	0.86	0.43	0.42

Abbreviation: mbsf, meters below seafloor. MI values >0.4 indicate the presence of microbial communities conducting the anaerobic oxidation of methane (Zhang et al., 2011). The BIT index was determined after Hopmans et al. (2004) and the MI after Zhang et al. (2011) using the following Equations: BIT=([GDGT-I]+[GDGT-II]+[GDGT-III])/([Crenarchaeol]+[GDGT-I]+[GDGT-II]+[GDGT-III]); MI=([GDGT-1]+[GDGT-2]+[GDGT-3])/([GDGT-1]+[GDGT-2]+[GDGT-3]+[Crenarchaeol]+[Crenarchaeol Isomer]). BIT values >0.4 indicate a high contribution of terrestrial material to the organic material (Hopmans et al., 2004).