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Figure F1. A. Total ion chromatogram of the ketone fraction of an early Eocene sample (318-U1356A-103R-4, 78–77 cm). B. Total ion chromatogram of the ketone fraction of a sample collected from Quaternary sediments from IODP Hole U1425B, Japan Sea. The suites of C₃₇, C₃₈, and C₃₉ alkenones are indicated (number in subscript denotes chain length). The molecular structures, specific identifications, and full IUPAC nomenclature are given for the C_37:2 and C_37:3 alkenones. Additionally, the electron impact mass spectrogram for the C_37:2 alkenone is illustrated. See text for details on compound identifications.

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