Figure F48. Mass chromatograms of the ions m/z 215 and 217 for coal, siltstone, and mudstone lithologies, Site C0020. Carbon numbers are noted above peaks. Δ4 = ster-4-ene; Δ5 = ster-5-ene; ααα R = 5α,14α,17α(H)20(R) steranes; βαα = 5β,14α,17α(H) steranes; αββ R = 5α,14β,17β(H) steranes; ααα S = 5α,14α,17α(S) steranes; αββ S = 5α,14β,17β(S) steranes.
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