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Subject
- Geology, Stratigraphic46
- Geology34
- Paleontology21
- Volcanic ash, tuff, etc6
- Mammals, Fossil5
- Gastropoda, Fossil4
- Sedimentary rocks4
- Sedimentation and deposition4
- Stratigraphic correlation4
- Petrology3
- Argillite2
- Borings2
- Coal mines and mining2
- Conglomerate2
- Evaporites2
- Geochemistry2
- Invertebrates, Fossil2
- Mineralogy2
- Mollusks, Fossil2
- Nuclear activation analysis2