Scanning electron microscopy 5 Article 4 transmission electron microscopy 4 High resolution transmission electron microscopy 3 Petroleum prospecting 3 enzyme activity 3 Biogeochemistry 2 Bituminous materials 2 Buried organic carbon 2 Geological surveys 2 Graptolite 2 Hydrocarbon generation organisms 2 Hydrocarbon potential 2 Hydrocarbons 2 Longmaxi Formation 2 Longmaxi formation 2 Macerals 2 Organic carbon 2 Organic-rich shales 2 Organics 2 Reflection 2 Shear bands 2 Solid bitumen 2 Study areas 2 buried organic carbon 2 comparative study 2 controlled study 2 graptolite 2 hydrocarbon generation organism 2 limit of detection 2