Figure F3. Comparison of organic carbon and total nitrogen molar ratios (C/N) to carbon isotopes. Dotted gray circle = Hole U1319A, solid gray circles = Hole U1320A, open black circles = Holes U1322B, U1322C, and U1322D, solid black circles = Holes U1324B and U1324C. Upper and lower dashed lines = typical C/N values for terrestrially derived organic matter and marine organics. A hypothetical mixing line connects marine (Mar; δ13C ≈ –20‰) and terrestrial (C3; δ13C ≈ –27‰) carbon isotopic end-members.
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