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geologic age
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        Ash Hollow Formation (4)
        
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        Barstow Formation (1)
        
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        Clarendonian (2)
        
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        Stevens Sandstone (1)
        
        upper Miocene
        
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        Valentine Formation (1)
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        lower Pliocene (4)
        
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      - upper Neogene (1)
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        Green River Formation (3)
        
        Lake Uinta (1)
        
        lower Eocene
        
        Willwood Formation (2)
        
        Wind River Formation (1)
        
        middle Eocene
        
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        Parachute Creek Member (1)
        
        upper Eocene
        
        Chadronian (1)
        
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        Brule Formation (2)
        
        Frio Formation (2)
        
        lower Oligocene (4)
        
        upper Oligocene (1)
        
        Vicksburg Group (1)
      - Paleocene
        
        lower Paleocene
        
        K-T boundary (2)
        
        Puercan (2)
        
        Torrejonian (1)
        
        Ludlow Member (1)
        
        Nacimiento Formation (1)
        
        Tongue River Member (1)
        
        upper Paleocene
        
        Thanetian (1)
      - Renova Formation (1)
      - upper Paleogene (1)
      - Wasatch Formation (3)
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      - Williamsburg Formation (1)
    - Sarmiento Formation (1)
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- Mesozoic
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      - Albian
        
        upper Albian (2)
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      - Campanian
        
        Cerro del Pueblo Formation (1)
        
        Dinosaur Park Formation (2)
        
        lower Campanian (2)
        
        upper Campanian (4)
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        Dunvegan Formation (2)
        
        lower Cenomanian (1)
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      - Fox Hills Formation (4)
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        Aguja Formation (1)
        
        Navarro Group (1)
        
        Olmos Formation (1)
        
        Woodbine Formation (3)
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      - Maestrichtian
        
        lower Maestrichtian (2)
        
        upper Maestrichtian (3)
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        middle Turonian (2)
        
        upper Turonian (1)
      - Tuscaloosa Formation (3)
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  - Jurassic
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    - Upper Jurassic
      - Brushy Basin Member (1)
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      - Swift Formation (1)
  - Kayenta Formation (1)
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  - Triassic
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    - Lower Triassic
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    - Middle Triassic
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    - Red Peak Formation (2)
    - Upper Triassic
      - Carnian
        
        Ischigualasto Formation (1)
      - Chinle Formation (7)
      - Crow Mountain Sandstone (1)
      - Dockum Group (1)
      - Norian (3)
      - Rhaetian (1)
      - Shinarump Member (2)
  - Wingate Sandstone (1)
- Paleozoic
  - Arbuckle Group (4)
  - Cambrian
    - Carrara Formation (1)
    - Lower Cambrian (1)
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    - Pioche Shale (1)
    - Upper Cambrian
      - Eau Claire Formation (1)
      - Lamotte Sandstone (2)
      - Mount Simon Sandstone (3)
  - Carboniferous
    - Bartlesville Sand (1)
    - Burbank Sand (1)
    - Lower Carboniferous
      - Asbian (1)
      - Dinantian (2)
    - Mississippian
      - Barnett Shale (3)
      - Lower Mississippian
        
        Lake Valley Formation (1)
        
        Lodgepole Formation (1)
        
        Tournaisian (2)
      - Madison Group (2)
      - Middle Mississippian
        
        Visean (1)
      - Upper Mississippian
        
        Chesterian (1)
        
        Fayetteville Formation (1)
        
        Meramecian
        
        Salem Limestone (1)
        
        Pennington Formation (2)
        
        Serpukhovian (1)
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    - Pennsylvanian
      - Conemaugh Group (1)
      - Cumberland Group (1)
      - Hermosa Group (3)
      - Joggins Formation (1)
      - Lower Pennsylvanian
        
        Morrowan
        
        Bloyd Formation (1)
      - Middle Pennsylvanian
        
        Atokan
        
        Atoka Formation (1)
        
        Breathitt Formation (1)
        
        Desmoinesian
        
        Cherokee Group (1)
        
        Marmaton Group (2)
        
        Moscovian (7)
        
        Paradox Formation (1)
      - Minturn Formation (1)
      - Monongahela Group (2)
      - Morrow Formation (2)
      - Upper Pennsylvanian
        
        Gzhelian (2)
        
        Kasimovian (5)
        
        Missourian
        
        Kansas City Group (5)
        
        Lansing Group (6)
        
        Rock Lake Shale Member (1)
        
        Stanton Formation (3)
        
        Virgilian
        
        Douglas Group (2)
        
        Lawrence Formation (1)
        
        Lecompton Limestone (1)
        
        Oread Limestone (1)
        
        Shawnee Group (2)
        
        Tonganoxie Sandstone (1)
        
        Wabaunsee Group (2)
    - Upper Carboniferous (8)
  - Chattanooga Shale (3)
  - Devonian
    - Beaverhill Lake Group (1)
    - Lower Devonian
      - Coeymans Formation (1)
      - Lochkovian (1)
      - Manlius Formation (1)
    - Middle Devonian
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      - Mahantango Formation (1)
      - Marcellus Shale (1)
      - Onondaga Limestone (1)
    - Upper Devonian
      - Duperow Formation (1)
      - Famennian (2)
      - Frasnian
        
        Leduc Formation (1)
      - Grosmont Formation (1)
      - Lime Creek Formation (1)
      - Ohio Shale (1)
  - Dunkard Group (1)
  - Exshaw Formation (1)
  - Honaker Trail Formation (1)
  - Horton Group (1)
  - Keyser Limestone (1)
  - lower Paleozoic (4)
  - Minnelusa Formation (3)
  - New Albany Shale (1)
  - Ordovician
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    - Middle Ordovician
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      - Platteville Formation (1)
      - Saint Peter Sandstone (3)
      - Simpson Group (2)
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      - Fairview Formation (1)
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  - Permian
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    - Cottonwood Limestone (1)
    - Council Grove Group (2)
    - Cutler Formation (3)
    - Eskridge Shale (2)
    - Glorieta Sandstone (1)
    - Guadalupian
      - Capitan Formation (1)
      - Capitanian (2)
      - Cherry Canyon Formation (1)
      - Roadian (2)
      - Tansill Formation (1)
      - Wordian (1)
    - Kaibab Formation (1)
    - Lower Permian
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      - Cisuralian
        
        Artinskian (1)
        
        Asselian (3)
        
        Kungurian (1)
        
        Sakmarian (4)
      - Leonard