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    - Middle Triassic
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  - Carboniferous
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      - Lower Mississippian
        
        Chouteau Limestone (1)
        
        Fort Payne Formation (1)
        
        Joana Limestone (3)
        
        Kinderhookian
        
        Banff Formation (5)
        
        Lake Valley Formation (1)
        
        Lodgepole Formation (5)
        
        Osagian
        
        Burlington Limestone (2)
        
        Keokuk Limestone (2)
        
        Tournaisian
        
        upper Tournaisian (1)
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        Visean
        
        upper Visean (1)
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      - Upper Mississippian
        
        Chesterian (10)
        
        Fayetteville Formation (3)
        
        Heath Formation (3)
        
        Meramecian
        
        Saint Louis Limestone (1)
        
        Sainte Genevieve Limestone (1)
        
        Pennington Formation (1)
        
        Serpukhovian (8)
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    - Pennsylvanian
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      - Lower Pennsylvanian
        
        Bashkirian (3)
        
        Morrowan
        
        Bloyd Formation (1)
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      - Middle Pennsylvanian
        
        Allegheny Group (3)
        
        Atokan (11)
        
        Breathitt Formation (1)
        
        Carbondale Formation (2)
        
        Desmoinesian
        
        Cherokee Group (1)
        
        Dugger Formation (1)
        
        Kanawha Formation (1)
        
        Kewanee Group (1)
        
        Moscovian (7)
        
        Paradox Formation (1)
      - Minturn Formation (1)
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      - Upper Pennsylvanian
        
        Canyon Group (2)
        
        Cisco Group (2)
        
        Gzhelian (6)
        
        Kasimovian (6)
        
        Missourian
        
        Kansas City Group (3)
        
        Lansing Group (2)
        
        Virgilian
        
        Douglas Group (1)
        
        Oread Limestone (1)
        
        Plattsmouth Limestone Member (2)
        
        Shawnee Group (2)
        
        Wabaunsee Group (2)
    - Springer Formation (1)
    - Upper Carboniferous
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  - Chattanooga Shale (5)
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  - Devonian
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    - Guilmette Formation (1)
    - Levis Shale (2)
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    - Lower Devonian
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    - Middle Devonian
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      - Eifelian (16)
      - Givetian
        
        upper Givetian (1)
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    - Millboro Shale (1)
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    - Upper Devonian
      - Famennian
        
        lower Famennian (2)
        
        upper Famennian (2)
        
        Wabamun Group (2)
      - Frasnian
        
        Leduc Formation (2)
        
        lower Frasnian (1)
        
        upper Frasnian (3)
      - Huron Member (1)
      - Kellwasser event (5)
      - Lime Creek Formation (2)
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    - Waterways Formation (1)
    - Zlichovian (1)
  - Earn Group (2)
  - Ellis Bay Formation (4)
  - Exshaw Formation (8)
  - Hanson Creek Formation (2)
  - Helderberg Group (1)
  - Hidden Valley Dolomite (4)
  - Honaker Trail Formation (1)
  - Ishbel Group (1)
  - Keyser Limestone (1)
  - Knox Group (1)
  - Lisburne Group (3)
  - lower Paleozoic
    - Cape Phillips Formation (4)
  - Merrimack Group (1)
  - middle Paleozoic (3)
  - Minnelusa Formation (1)
  - New Albany Shale (3)
  - Oquirrh Formation (1)
  - Ordovician
    - Acoite Formation (1)
    - Antelope Valley Limestone (1)
    - Buchans Group (2)
    - Catoche Formation (3)
    - Davidsville Group (2)
    - Ely Springs Dolomite (3)
    - Eureka Quartzite (2)
    - Gualcamayo Formation (1)
    - Lexington Limestone (1)
    - Lower Ordovician
      - Arenigian (23)
      - Beekmantown Group (6)
      - El Paso Group (1)
      - Ellenburger Group (2)
      - Fillmore Formation (2)
      - Floian (4)
      - Ibexian (8)
      - Manitou Formation (3)
      - Oneota Dolomite (1)
      - Prairie du Chien Group (1)
      - Saint George Group (3)
      - Shakopee Formation (1)
      - Tremadocian (27)
    - Martinsburg Formation (1)
    - Middle Ordovician
      - Bromide Formation (1)
      - Champlainian (2)
      - Chazyan (4)
      - Dapingian (5)
      - Darriwilian (14)
      - Decorah Shale (5)
      - Deicke Bentonite Bed (4)
      - Dolgeville Formation (1)
      - Galena Dolomite (2)
      - Llandeilian (6)
      - Llanvirnian (4)
      - Millbrig Bentonite Bed (1)
      - Platteville Formation (3)
      - Saint Peter Sandstone (1)
      - Simpson Group (3)
      - Table Head Group (3)
      - Whiterockian (4)
      - Winnipeg Formation (1)
    - Montoya Group (2)
    - Pogonip Group (1)
    - Tetagouche Group (1)
    - Trenton Group (4)
    - Upper Ordovician
      - Ashgillian (3)
      - Bighorn Dolomite (2)
      - Caradocian (10)
      - Cincinnatian
        
        Maysvillian (2)
        
        Richmondian (4)
      - Edenian (2)
      - Fish Haven Dolomite (1)
      - Hirnantian (8)
      - Katian (9)
      - Kope Formation (1)
      - Maquoketa Formation (2)
      - Mohawkian (3)
      - Queenston Shale (2)
      - Sandbian (7)
      - Trentonian (5)
    - Utica Shale (1)
    - Valmy Formation (1)
    - Vinini Formation (3)
  - Permian
    - Blaine Formation (1)
    - Chase Group (1)
    - Council Grove Group (2)
    - Guadalupian
      - Bell Canyon Formation (2)
      - Brushy Canyon Formation (2)
      - Capitanian (6)
      - Cherry Canyon Formation (1)
      - Roadian (2)
      - Wordian (5)
    - Kaibab Formation (2)
    - Khuff Formation (1)
    - Lower Permian
      - Cherry Canyon Formation (1)
      - Cisuralian
        
        Artinskian (8)
        
        Asselian (5)
        
        Kungurian (4)
        
        Sakmarian (6)
      - Leonardian
        
        Bone Spring Limestone (2)
      - Qixia Formation (3)
      - Wolfcampian (4)
    - Maokou Formation (3)
    - Middle Permian (6)
    - Park City Formation (1)
    - Phosphoria Formation (6)
    - Retort Phosphatic Shale Member (1)
    - Upper Permian
      - Changxing Formation (1)
      - Kazanian (1)
      - Lopingian
        
        Changhsingian (5)
        
        Wuchiapingian (4)
      - Permian-Triassic boundary (39)
      - Tatarian (1)
      - Zechstein (1)
  - Pilot Shale (2)
  - Read Bay Formation (1)
  - Road River Formation (9)
  - Sauk Sequence (2)
  - Shoo Fly Complex (2)
  - Silurian
    - Bainbridge Formation (2)
    - Clinch Sandstone (1)
    - Henryhouse Formation (1)
    - Lockport Formation (2)
    - Lower Silurian
      - Alexandrian (1)
      - Brassfield Formation (1)
      - Llandovery
        
        Aeronian (4)
        
        Rhuddanian (3)
        
        Telychian (4)
      - Wenlock
        
        Homerian (5)
        
        Sheinwoodian (2)
      - Whirlpool Sandstone (1)
    - Middle Silurian
      - Clinton Group (2)
      - Racine Dolomite (1)
      - Roberts Mountains Formation (7)
      - Rose Hill Formation (1)
      - Waldron Shale (1)
    - Niagaran (5)
    - Upper Silurian
      - Cayugan
        
        Tonoloway Limestone (1)
      - Ludlow
        
        Gorstian (2)
        
        Ludfordian (4)