FIG. 2.

Geochemical pore water and sediment measurements with depth in core 5, dive 4566, GC205, Gulf of Mexico. (A) Concentrations of sulfate (*) and methane (•); the shaded regions labeled SURF, SMI-1, and SMI-2 indicate sediment sections used for clone libraries. (B) δ¹³C of methane (•). (C) %TOC (⧫) and C/N ratio (*). (D) Chloride concentration (▴). The error bars in panels A and B represent the 95% confidence intervals of instrumental error. The error bars in panels C and D represent the 95% confidence intervals for triplicate measurements of each sample.