Figure 3. Schematic diagram showing the high-resolution sampling of sediments in Hole 995B. Cores 164-995B-1H and 2H sampled the sulfate-reduction and uppermost methanogenic zones. Core depths in meters (m) are cumulative; note that sediments from 8.3 to 16 m were not sampled. Also note that two sections of Core 164-995B-2H (Sections 2H-4 and 5) were sampled further to measure methane concentrations (Table 3; Hoehler et al., Chap. 8, this volume). The sulfate-methane interface (SMI) at Site 995 is at 20.5 meters below seafloor (mbsf). Samples 4.5 m above and 5 m below the SMI were taken in the same core (Core 164-995B-2H), so that the samples accurately record depths (with concentration and isotopic data) relative to the SMI.