Figure 4

GC–MS total ion chromatograms of aromatic fractions of: (i) Diplazites unita TF-1; (ii) Odontopteris sp. SF-3; (iii) Asterophyllites sp. AT-2. PAH’s polycyclic aromatic hydrocarbons, P phenanthrene, MPs methylphenanthrenes, BFlas benzofluoranthenes, BPy benzopyrenes.