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Figure F49. Mass chromatograms of the ions m/z 191 for hopanes and other pentacyclic triterpenoids for samples of coal, mudstone, and siltstone, Site C0020. Data are also shown for an oil stained sandstone. αβ = 17α,21β(H) hopane; βα = 17β,21α(H); ββ = 17β,21β(H) hopane; αβ S = 17α,21β(H)22(S) hopane; Δ17 = hop-17-ene; Δ13 = hop-13-ene. Pairs of S and R isomers of the same hopane compound are bracketed on the chromatograms.

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