Fig. 2.
Selected biomarker classes identified in black shales (sample 08, drill core S2, 140.25 m) of the El Mreïti Group. (A) Summed GC-MS metastable reaction monitoring (MRM) chromatograms of M+ → 191 transitions of the saturated fraction. A complete homologous series of 17α(H),21β(H)-hopanes with 27–35 carbon atoms (black triangles) were identified. Ts = 18α(H)-22,29,30 trisnorneohopane, Tm = 17α(H)-22,29,30-trisnorhopane, and γ = gammacerane. (B) m/z 134 selected ion recording chromatogram of the aromatic fraction. Filled circles, 2,3,6-AI; open circles, 2,3,4-AI.