Figure F10. A. Occurrence of wood and lignite fragments in cuttings, Site C0020. B. Proportion of C29 Δ4 and Δ5 sterenes as a proportion of C27 to C29 Δ4 and Δ5 sterene-homologues (solid circles = coal, open circles = mudstone, x = cuttings, + = siltstone). C. m/z 215 ion chromatogram displaying doublets of Δ4 and Δ5 sterene. More detailed labeling provided in “Organic geochemistry” in the “Site C0020” chapter (Expedition 337 Scientists, 2013).
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