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Subject
- Geology, Stratigraphic19
- Geology11
- Paleontology11
- Paleobotany10
- Palynology8
- Coal4
- Petroleum3
- Sedimentation and deposition3
- Angiosperms, Fossil2
- Arthropoda, Fossil2
- Bivalves, Fossil2
- Gastropoda, Fossil2
- Insect-plant relationships2
- Insects, Fossil2
- Natural gas2
- Paleogeography2
- Petrology2
- Sills (Geology)2
- Stratigraphic correlation2
- Trace fossils2