Figure F14. Biogeochemical profiles in sediments from the northern margin (Woodlark Rise) sites, Leg 180: A. Total bacterial populations at Sites 1109, 1115, and 1118. The solid curve represents a general regression line of bacterial numbers vs. depth in deep-sea sediments (Parkes et al., 1994), with 95% upper and lower prediction limits shown by dashed curves. Sulfate, ammonia, and methane depth profiles at Sites (B) 1118, (C) 1109, and (D) 1115. Unconformity at each site represented by wavy line. E. C₁/C₂ ratios at Sites 1108, 1109, 1115, and 1118.