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      - Lower Mississippian
        
        Fort Payne Formation (2)
        
        Kayak Shale (1)
        
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        Kinderhookian
        
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        Osagian
        
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        Chesterian (5)
        
        Fayetteville Formation (3)
        
        Hartselle Sandstone (6)
        
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        Morrowan
        
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        Atokan
        
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        Desmoinesian
        
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        Staunton Formation (1)
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        Gzhelian (1)
        
        Missourian
        
        Kansas City Group (1)
        
        Virgilian
        
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        Wescogame Formation (1)
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    - Upper Carboniferous
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    - Upper Devonian
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  - Dunkard Group (1)
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  - lower Paleozoic
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  - middle Paleozoic
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  - Ordovician
    - Lower Ordovician
      - Arenigian
        
        Ballantrae Complex (1)
      - Beekmantown Group (2)
      - Ellenburger Group (10)
      - Kindblade Formation (1)
      - Tremadocian (2)
    - Martinsburg Formation (3)
    - Middle Ordovician
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      - Cloridorme Formation (1)
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      - Stones River Group (1)
    - Trenton Group (3)
    - Upper Ordovician
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      - Juniata Formation (1)
      - Katian (1)
      - Maquoketa Formation (1)
      - Reedsville Formation (1)
      - Sandbian (1)
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      - Wufeng Formation (1)
    - Utica Shale (4)
    - Viola Limestone (3)
  - Permian
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    - Council Grove Group (1)
    - Cutler Formation (1)
    - Ecca Group (1)
    - Guadalupian
      - Bell Canyon Formation (1)
      - Brushy Canyon Formation (1)
      - Cherry Canyon Formation (1)
      - Delaware Mountain Group (3)
      - Tansill Formation (1)
    - Kaibab Formation (1)
    - Lower Permian
      - Abo Formation (1)
      - Cherry Canyon Formation (1)
      - Cisuralian
        
        Artinskian (1)
        
        Asselian (2)
        
        Kungurian (3)
        
        Sakmarian (1)
      - Leonardian
        
        Bone Spring Limestone (1)
      - Wolfcampian (9)
    - Lyons Sandstone (2)
    - Middle Permian (2)
    - Toroweap Formation (1)
    - Upper Permian
      - Lopingian (1)
      - Permian-Triassic boundary (1)
    - Wellington Formation (2)
    - Yates Formation (1)
  - Rangeley Formation (1)
  - Sauk Sequence (2)
  - Shawangunk Formation (1)
  - Silurian
    - Lower Silurian
      - Tuscarora Formation (1)
      - Wenlock (1)
    - Upper Silurian
      - Salina Group (1)
  - Supai Formation (1)
  - Talladega Group (2)
  - upper Paleozoic
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    - Fountain Formation (1)
    - Kaskaskia Sequence (1)
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    - Wood River Formation (1)
  - Waits River Formation (1)
  - Woodford Shale (6)
- Phanerozoic (18)
- Precambrian
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  - Hazel Formation (1)
  - Nonesuch Shale (1)
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  - Unkar Group (1)
  - upper Precambrian
    - Proterozoic
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        Baraboo Quartzite (1)
      - Keweenawan
        
        Copper Harbor Conglomerate (1)
        
        Portage Lake Lava Series (1)
      - Mesoproterozoic
        
        Freda Sandstone (1)
        
        Stenian (1)
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      - Neoproterozoic
        
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        Ediacaran (2)
        
        Maranon Complex (2)
        
        Moine Supergroup (1)
        
        Moinian (1)
        
        Riphean (1)
        
        Tonian (2)
        
        Vendian (2)
        
        Walden Creek Group (2)
      - Oronto Group (1)
      - Paleoproterozoic (21)
- Rhenohercynian (1)
- Saxothuringian (1)
igneous rocks
- igneous rocks
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  - plutonic rocks
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    - diorites
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