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        lower Eocene
        
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        middle Eocene
        
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        upper Eocene
        
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        upper Paleocene
        
        Tiffanian (1)
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      - Campanian
        
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      - Cenomanian
        
        Dunvegan Formation (1)
        
        upper Cenomanian (2)
      - Codell Sandstone Member (1)
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      - Fruitland Formation (11)
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      - Hell Creek Formation (4)
      - Hilliard Shale (1)
      - Horseshoe Canyon Formation (7)
      - Judith River Formation (1)
      - Kirtland Shale (1)
      - K-T boundary (7)
      - Lance Formation (3)
      - Lewis Shale (2)
      - Maestrichtian
        
        upper Maestrichtian (1)
      - Menefee Formation (7)
      - Mesaverde Group (16)
      - Niobrara Formation (1)
      - Oldman Formation (3)
      - Pakawau Group (3)
      - Pictured Cliffs Sandstone (3)
      - Pierre Shale (1)
      - Point Lookout Sandstone (2)
      - Price River Formation (1)
      - Rock Springs Formation (4)
      - Saint Mary River Formation (1)
      - Santonian (3)
      - Senonian (19)
      - Star Point Sandstone (4)
      - Straight Cliffs Formation (1)
      - Tununk Member (1)
      - Turonian (4)
      - Williams Fork Formation (7)
    - Whitemud Formation (1)
  - Franciscan Complex (1)
  - Jurassic
    - Bazhenov Formation (2)
    - Birkhead Formation (2)
    - Ferrar Group (1)
    - Lower Jurassic
      - lower Liassic (1)
      - Pliensbachian (1)
      - Toarcian
        
        lower Toarcian (1)
      - upper Liassic (1)
    - Middle Jurassic
      - Aalenian (1)
      - Bajocian (2)
      - Bathonian (4)
      - Callovian (7)
      - Walloon Coal Measures (2)
      - Xishanyao Formation (2)
    - Upper Jurassic
      - Bowser Lake Group (1)
      - Kimmeridge Clay (1)
      - Kimmeridgian (4)
      - Morrison Formation (2)
      - Oxfordian (4)
      - Portlandian (1)
      - Tithonian (2)
      - Volgian (1)
  - Mist Mountain Formation (4)
  - Murihiku Supergroup (1)
  - Triassic
    - Lower Triassic
      - Permian-Triassic boundary (9)
    - Middle Triassic (3)
    - Sherwood Sandstone (2)
    - Upper Triassic
      - Carnian (4)
      - Molteno Formation (1)
      - Rhaetian (1)
      - Yanchang Formation (1)
  - Yanshanian (1)
- Paleozoic
  - Berea Sandstone (1)
  - Cambrian
    - Middle Cambrian (1)
    - Upper Cambrian
      - Eau Claire Formation (1)
      - Mount Simon Sandstone (1)
  - Carboniferous
    - Benxi Formation (3)
    - Culm (1)
    - Lower Carboniferous
      - Asbian (1)
      - Dinantian (4)
    - Mabou Group (2)
    - Middle Carboniferous (1)
    - Mississippian
      - Lower Mississippian
        
        Kekiktuk Conglomerate (1)
        
        Pocono Formation (1)
      - Middle Mississippian
        
        Visean
        
        Great Scar Limestone (1)
      - Upper Mississippian
        
        Chesterian (2)
        
        Heath Formation (1)
        
        Mauch Chunk Formation (2)
        
        Pennington Formation (1)
      - Windsor Group (1)
    - Namurian (9)
    - Pennsylvanian
      - Brazil Formation (1)
      - Conemaugh Group (2)
      - Cumberland Group (3)
      - Freeport Formation (5)
      - Herrin Coal Member (8)
      - Joggins Formation (1)
      - Kittanning Formation (6)
      - Lower Pennsylvanian
        
        Bashkirian (1)
        
        Caseyville Formation (1)
        
        Lee Formation (2)
        
        Morrowan (1)
        
        New River Formation (2)
        
        Pocahontas Formation (5)
      - Mary Lee Coal (1)
      - Middle Pennsylvanian
        
        Allegheny Group (14)
        
        Atokan
        
        Atoka Formation (1)
        
        Breathitt Formation (4)
        
        Carbondale Formation (9)
        
        Danville Coal Member (2)
        
        Desmoinesian
        
        Boggy Shale (1)