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    - Meguma Group (2)
    - Middle Ordovician
      - Ammonoosuc Volcanics (1)
      - Darriwilian (6)
      - Llandeilian (3)
      - Llanvirnian (4)
    - 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 (1)
      - Cisuralian
        
        Artinskian (2)
        
        Asselian (7)
        
        Kungurian (3)
        
        Sakmarian (8)
      - Leonardian (1)
      - Wolfcampian (1)
    - Middle Permian (6)
    - Rio Bonito Formation (4)
    - Unayzah Formation (1)
    - Upper Permian
      - Kazanian (1)
      - Lopingian
        
        Changhsingian (4)
        
        Wuchiapingian (1)
      - Permian-Triassic boundary (9)
      - 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)
    - Upper Silurian
      - Ludlow
        
        Gorstian (1)
        
        Ludfordian (1)
      - Pridoli (4)
  - upper Paleozoic
    - Copacabana Group (1)
    - Dwyka Formation (4)
    - Guandacol Formation (1)
    - Shanxi Formation (1)
  - Wissahickon Formation (2)
- Phanerozoic (21)
- Precambrian
  - Archean
    - Mesoarchean (3)
    - Napier Complex (1)
    - Neoarchean
      - Dharwar Supergroup (1)
    - Paleoarchean (2)
  - Eocambrian (1)
  - Hadean (1)
  - Purcell System (1)
  - upper Precambrian
    - Mahakoshal Group (1)
    - Proterozoic
      - Bambui Group (1)
      - Damara System (9)
      - Huronian (1)
      - Mesoproterozoic
        
        Belt Supergroup (1)
        
        Helikian (2)
        
        Stenian (2)
      - Neoproterozoic
        
        Brioverian (1)
        
        Burra Group (1)
        
        Cryogenian (6)
        
        Ediacaran (24)
        
        Infracambrian (1)
        
        Maranon Complex (1)
        
        Moine Supergroup (1)
        
        Nantuo Formation (1)
        
        Otavi Group (2)
        
        Riphean (1)
        
        Tonian (5)
        
        Vendian (10)
        
        Wilpena Group (1)
      - Paleoproterozoic
        
        Birimian (1)
      - Pretoria Group (1)
      - Sinian
        
        Nantuo Formation (1)
      - Umberatana Group (1)
  - Ventersdorp Supergroup (1)
  - Waterberg System (1)