Figure F5. Plot of concentration vs. isotope composition of total organic carbon (TOC) and total nitrogen (TN) of sediments from Site 1040. The data are divided factitiously into two groups: uppermost 8 mbsf and below 8 mbsf. Data for samples below 8 mbsf show a crude negative relationship between concentrations and isotope compositions. Data for samples in the uppermost 8 mbsf show a weak positive linear correlation of concentrations and isotope compositions. VPDB = Vienna Peedee belemnite.

Figure F5. Plot of concentration vs. isotope composition of total organic carbon (TOC) and total nitrogen (TN) of sediments from Site 1040. The data are divided factitiously into two groups: uppermost 8 mbsf and below 8 mbsf. Data for samples below 8 mbsf show a crude negative relationship between concentrations and isotope compositions. Data for samples in the uppermost 8 mbsf show a weak positive linear correlation of concentrations and isotope compositions. VPDB = Vienna Peedee belemnite.