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elements, isotopes
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fossils
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geochronology methods
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geologic age
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        lower Eocene
        
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        middle Eocene
        
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        Tyee Formation (1)
        
        upper Eocene
        
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        upper Oligocene (1)
      - Paleocene
        
        lower Paleocene
        
        Danian (1)
        
        K-T boundary (4)
        
        Midway Group (1)
        
        Ravenscrag Formation (2)
        
        Tongue River Member (1)
        
        upper Paleocene (1)
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- Coal Measures (1)
- Mesozoic
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      - Moosebar Formation (1)
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      - Gulfian
        
        Austin Chalk (1)
        
        Eagle Ford Formation (4)
        
        Woodbine Formation (1)
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  - Franciscan Complex (4)
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  - Jurassic
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    - Lower Jurassic
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  - Triassic
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    - Upper Triassic
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- Paleozoic
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    - Lower Carboniferous
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      - Lower Mississippian
        
        Tournaisian (2)
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        Visean (5)
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      - Upper Mississippian
        
        Chesterian (1)
        
        Heath Formation (1)
        
        Meramecian (1)
      - Windsor Group (2)
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    - Pennsylvanian
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      - Kittanning Formation (3)
      - Lower Pennsylvanian (1)
      - Mary Lee Coal (1)
      - Middle Pennsylvanian
        
        Allegheny Group (2)
        
        Atokan
        
        Atoka Formation (2)
        
        Carbondale Formation (1)
        
        Danville Coal Member (1)
        
        Desmoinesian
        
        Spiro Sandstone (1)
        
        Dugger Formation (1)
        
        Kanawha Formation (1)
      - Morien Group (1)
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      - Upper Pennsylvanian
        
        Cisco Group (1)
        
        Sturgis Formation (2)
    - Springer Formation (1)
    - Upper Carboniferous
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      - Westphalian (10)
  - Chattanooga Shale (1)
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    - Lower Devonian
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    - Middle Devonian
      - Marcellus Shale (3)
      - Nahanni Formation (1)
      - Sulphur Point Formation (1)
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    - Old Red Sandstone (3)
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    - Upper Devonian
      - Cleveland Member (1)
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      - Famennian
        
        upper Famennian (1)
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      - West Falls Formation (1)
  - Exshaw Formation (2)
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  - lower Paleozoic
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  - Ordovician
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    - Upper Ordovician
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    - Utica Shale (2)
  - Permian
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    - Lower Permian
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        Artinskian (1)
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    - Upper Permian
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        Changhsingian (1)
      - Permian-Triassic boundary (2)
      - Raniganj Formation (1)
      - Zechstein (1)
    - Whitehill Formation (1)
  - Pilot Shale (2)
  - Silurian
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      - Wenlock (1)
  - Taiyuan Formation (4)
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  - upper Paleozoic
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    - Tirrawarra Sandstone (1)
  - Woodford Shale (10)
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- Precambrian
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  - upper Precambrian
    - Proterozoic
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        Roper Group (1)
igneous rocks
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metamorphic rocks
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minerals
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        opal-A (1)
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- sulfides
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Primary terms
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- Africa
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- carbon
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- Cenozoic
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        Mount Messenger Formation (1)
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        Green River Formation (7)
        
        lower Eocene
        
        Thebes Formation (1)
        
        middle Eocene
        
        Sparta Sand (1)
        
        Tyee Formation (1)
        
        upper Eocene
        
        Uinta Formation (1)
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        lower Oligocene (3)
        
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      - Paleocene
        
        lower Paleocene
        
        Danian (1)
        
        K-T boundary (4)
        
        Midway Group (1)
        
        Ravenscrag Formation (2)
        
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        upper Paleocene (1)
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