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elements, isotopes
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  - stable isotopes
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- metals
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- noble gases
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- oxygen
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- sulfur
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fossils
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        Kinderhookian
        
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        Lodgepole Formation (5)
        
        Osagian
        
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        Tournaisian (7)
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        Chesterian
        
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        Meramecian
        
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      - Upper Pennsylvanian
        
        Cisco Group (1)
        
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    - Upper Devonian
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        upper Famennian (2)
        
        Wabamun Group (5)
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        Leduc Formation (5)
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        Borrowdale Volcanic Group (2)
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  - Permian
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    - Cutler Formation (5)
    - Ecca Group (29)
    - Echooka Formation (1)
    - Gharif Formation (1)
    - Guadalupian
      - Bell Canyon Formation (4)
      - Brushy Canyon Formation (5)
      - Capitan Formation (1)
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      - Cherry Canyon Formation (3)
      - Delaware Mountain Group (6)
      - Grayburg Formation (2)
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    - Khuff Formation (13)
    - Longtan Formation (1)
    - Lower Permian
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        Artinskian (1)
        
        Asselian (1)
        
        Kungurian (2)
        
        Sakmarian (2)
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        Bone Spring Limestone (1)
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    - Shihezi Formation (2)
    - Unayzah Formation (5)
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      - Salado Formation (1)
      - Zechstein (3)
    - Vryheid Formation (2)
    - Whitehill Formation (11)
    - Yeso Formation (1)
  - Pilot Shale (3)
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      - Llandovery
        
        Rhuddanian (2)
        
        Telychian (1)
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        Homerian (1)
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    - Upper Silurian
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        Tonoloway Limestone (2)
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Primary terms
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