Figure F29. Gas chromatography FID traces of solvent-extractable compounds for Samples 306-U1314A-4H-4, 145–150 cm, and 27H-4, 82–84 cm, showing the difference of extractable organic matter with a predominant terrigenous nature (top panel) and EOM dominated by a marine source (bottom panel). Numbers above or below peaks refer to carbon atom numbers of n-alkanes and long-chain alkenones, respectively. Number of double bonds for C37 alkenones are given as :4, :3, and :2. X = contaminant.
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