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geologic age
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        lower Miocene (6)
        
        middle Miocene
        
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        upper Miocene
        
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        Green River Formation (5)
        
        lower Eocene
        
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        middle Eocene
        
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        upper Eocene (5)
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        middle Oligocene
        
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      - Paleocene
        
        lower Paleocene
        
        Danian (3)
        
        K-T boundary (10)
        
        Puercan (1)
        
        middle Paleocene
        
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        Tullock Member (1)
        
        upper Paleocene
        
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      - Paleocene-Eocene Thermal Maximum (3)
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  - upper Cenozoic (3)
- Mesozoic
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    - Lower Cretaceous
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        upper Albian (2)
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        Shuaiba Formation (1)
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    - Middle Triassic
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    - Upper Triassic
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      - Rhaetian
        
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- Paleozoic
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    - Middle Cambrian
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  - Carboniferous
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        Chesterian (3)
        
        Hartselle Sandstone (1)
        
        Pennington Formation (1)
        
        Serpukhovian (2)
    - Namurian (1)
    - Pennsylvanian
      - Herrin Coal Member (1)
      - Lower Pennsylvanian (1)
      - Middle Pennsylvanian
        
        Desmoinesian (3)
        
        Moscovian (1)
      - Morrow Formation (1)
      - Upper Pennsylvanian
        
        Gzhelian (1)
        
        Kasimovian (1)
        
        Missourian (1)
        
        Virgilian
        
        Shawnee Group (1)
    - Upper Carboniferous
      - Westphalian (3)
  - Catskill Formation (1)
  - Devonian
    - Genesee Group (1)
    - Guilmette Formation (2)
    - Lower Devonian
      - Emsian (1)
      - Oriskany Sandstone (2)
    - Middle Devonian
      - Cedar Valley Formation (1)
      - Columbus Limestone (1)
      - Eifelian (2)
      - Givetian (2)
      - Hamilton Group (8)
      - Ludlowville Formation (1)
      - Marcellus Shale (3)
      - Moscow Formation (2)
      - Tully Limestone (2)
    - Upper Devonian
      - Brallier Shale (2)
      - Cleveland Member (1)
      - Famennian (6)
      - Frasnian (7)
  - Exshaw Formation (1)
  - Knox Group (2)
  - lower Paleozoic
    - Ashe Formation (1)
  - Ordovician
    - Clays Ferry Formation (1)
    - Lexington Limestone (2)
    - Lower Ordovician
      - Arenigian (1)
      - El Paso Group (1)
      - Manitou Formation (1)
      - Tremadocian (3)
    - Martinsburg Formation (1)
    - Middle Ordovician
      - Blackriverian (1)
      - Chazy Group (2)
      - Chazyan (1)
      - Darriwilian (1)
      - Platteville Formation (1)
      - Whiterockian (1)
    - Montoya Group (1)
    - Trenton Group (1)
    - Upper Ordovician
      - Ashgillian (3)
      - Bighorn Dolomite (2)
      - Caradocian (1)
      - Cincinnatian
        
        Maysvillian (1)
        
        Richmondian (2)
      - Fairview Formation (2)
      - Katian (5)
      - Kope Formation (4)
      - Mohawkian (3)
      - Reedsville Formation (2)
      - Whitewater Formation (1)
    - Utica Shale (2)
  - Permian
    - Chase Group (1)
    - Council Grove Group (1)
    - Ecca Group (9)
    - Gharif Formation (1)
    - Guadalupian
      - Bell Canyon Formation (2)
      - Capitanian (11)
      - Queen Formation (1)
      - Roadian (2)
      - Tansill Formation (1)
      - Wordian (2)
    - Illawarra Coal Measures (1)
    - Khuff Formation (7)
    - Longtan Formation (1)
    - Lower Permian
      - Al Khlata Formation (1)
      - Cisuralian
        
        Artinskian (3)
        
        Asselian (3)
        
        Kungurian (2)