Figure 9. Depth profile for total organic carbon (TOC) for Site 1000 reported as weight percent on a total sediment basis (open diamonds) and a carbonate-free basis (solid squares). A schematic of the interstitial sulfate profile has been included for comparison (see Fig. 10 for the actual profile). Concentrations of calcium carbonate over the same interval and the stratigraphic position of the hydrocarbon-enriched zone are also included (see text for discussion).