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Subject
- Geology, Stratigraphic32
- Paleontology24
- Geology21
- Paleobotany12
- Coal7
- Foraminifera, Fossil5
- Mammals, Fossil5
- Plants, Fossil4
- Formations (Geology)3
- Nannofossils3
- Palynology3
- Sedimentation and deposition3
- Bryozoa2
- Cheilostomata, Fossil2
- Conglomerate2
- Minerisporites2
- Paleobiogeography2
- Paleontology, Stratigraphic2
- Petrology2
- Pollen, Fossil2