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      - Upper Mississippian
        
        Hinton Formation (1)
        
        Mauch Chunk Formation (1)
        
        Serpukhovian (2)
      - Windsor Group (3)
    - Namurian (7)
    - Pennsylvanian
      - Joggins Formation (1)
      - Lower Pennsylvanian (1)
      - Middle Pennsylvanian
        
        Allegheny Group (1)
        
        Moscovian (4)
      - Morien Group (1)
      - Pottsville Group (2)
      - Upper Pennsylvanian
        
        Gzhelian (1)
        
        Kasimovian (1)
        
        Virgilian (1)
    - Tesnus Formation (1)
    - Upper Carboniferous
      - Stephanian (1)
      - Westphalian (4)
  - Casco Bay Group (1)
  - Devonian
    - Lower Devonian
      - Emsian (1)
      - Lochkovian (4)
      - Pragian (1)
    - Middle Devonian
      - Eifelian (1)
      - Givetian (4)
    - Muth Quartzite (1)
    - Old Red Sandstone (2)
    - Upper Devonian
      - Famennian (7)
      - Frasnian
        
        upper Frasnian (1)
      - Kellwasser event (1)
  - Hanson Creek Formation (1)
  - Itarare Subgroup (4)
  - lower Paleozoic
    - Wilmington Complex (1)
  - Matapedia Group (1)
  - middle Paleozoic (4)
  - Ordovician
    - Acoite Formation (2)
    - Lower Ordovician
      - Arenigian (8)
      - El Paso Group (2)
      - Fillmore Formation (1)
      - Floian (4)
      - Ibexian (1)
      - Manx Group (1)
      - Tremadocian
        
        Halifax Formation (2)
    - Meguma Group (2)
    - Middle Ordovician
      - Ammonoosuc Volcanics (1)
      - Dapingian (1)
      - Darriwilian (8)
      - Llandeilian (3)
      - Llanvirnian (5)
    - Montoya Group (1)
    - Skiddaw Slates (3)
    - Upper Ordovician
      - Ashgillian (12)
      - Caradocian
        
        Borrowdale Volcanic Group (2)
      - Hirnantian (13)
      - Juniata Formation (1)
      - Katian (3)
      - Sandbian (1)
      - Wufeng Formation (1)
    - Wild Bight Group (2)
  - Paganzo Group (1)
  - Permian
    - Buckley Formation (1)
    - Cutler Formation (1)
    - Ecca Group (2)
    - Guadalupian
      - Capitanian (2)
      - Delaware Mountain Group (1)
      - Roadian (2)
      - Wordian (1)
    - Khuff Formation (2)
    - Lower Permian
      - Al Khlata Formation (3)
      - Barakar Stage (3)
      - Cisuralian
        
        Artinskian (3)
        
        Asselian (8)
        
        Kungurian (3)
        
        Sakmarian (9)
      - Leonardian (1)
      - Wolfcampian (1)
    - Middle Permian (6)
    - Newcastle Coal Measures (1)
    - Rio Bonito Formation (5)
    - Unayzah Formation (1)
    - Upper Permian
      - Kazanian (1)
      - Lopingian
        
        Changhsingian (4)
        
        Wuchiapingian (1)
      - Permian-Triassic boundary (12)
      - Raniganj Formation (1)
      - Tatarian (1)
    - Wellington Formation (1)
    - Whitehill Formation (1)
  - Sauk Sequence (2)
  - Silurian
    - Lower Silurian
      - Llandovery
        
        Aeronian (2)
        
        Rhuddanian (3)
        
        Telychian (2)
      - Qalibah Formation (2)
      - Wenlock
        
        Homerian (1)
        
        Sheinwoodian (1)
    - Middle Silurian (2)