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- Geology[remove]229
- Geology, Stratigraphic67
- Paleontology12
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- Volcanic ash, tuff, etc8
- Biology6
- Earth sciences6
- Petrology6
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- Borings4
- Darwin, Charles, 1809-18824
- Glacial epoch4
- Paleoclimatology4
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- Bible3
- Coal3
- Geochemistry3
- Lahars3
- Lyell, Charles, Sir, 1797-18753