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    - Upper Cambrian (2)
  - Carboniferous
    - Benxi Formation (1)
    - Mississippian
      - Barnett Shale (2)
      - Lower Mississippian
        
        Kayak Shale (1)
        
        Lodgepole Formation (1)
      - Madison Group (1)
      - Middle Mississippian (1)
      - Upper Mississippian
        
        Chesterian (1)
    - Pennsylvanian
      - Lower Pennsylvanian (1)
      - Middle Pennsylvanian
        
        Atokan (1)
        
        Paradox Formation (1)
      - Pottsville Group (1)
      - Upper Pennsylvanian (1)
    - Springer Formation (1)
  - Devonian
    - Keg River Formation (1)
    - Lower Devonian
      - Emsian (1)
      - Lochkovian (1)
      - Pragian (1)
    - Middle Devonian
      - Givetian (2)
      - Marcellus Shale (2)
    - Old Red Sandstone (1)
    - Upper Devonian
      - Famennian (2)
      - Frasnian (3)
      - Grosmont Formation (1)
      - Kanayut Conglomerate (1)
  - Exshaw Formation (2)
  - Hunton Group (1)
  - lower Paleozoic (2)
  - middle Paleozoic (1)
  - New Albany Shale (1)
  - Ordovician
    - Lower Ordovician (1)
    - Meguma Group (1)
    - Middle Ordovician
      - Bromide Formation (1)
      - Chazyan (1)
      - Normanskill Formation (1)
    - Trenton Group (1)
    - Upper Ordovician
      - Caradocian (1)
      - Hirnantian (1)
      - Katian (1)
      - Sandbian (2)
      - Trentonian (1)
    - Utica Shale (1)
    - Viola Limestone (1)
  - Permian
    - Cutler Formation (1)
    - Gharif Formation (1)
    - Guadalupian
      - Capitanian (1)
      - Roadian (1)
      - Wordian (1)
    - Kaibab Formation (1)
    - Khuff Formation (1)
    - Lower Permian
      - Al Khlata Formation (1)
      - Cisuralian
        
        Artinskian (2)
        
        Asselian (1)
        
        Kungurian (2)
        
        Sakmarian (1)
      - Leonardian (1)
    - Meade Peak Member (2)
    - Park City Formation (1)
    - Phosphoria Formation (2)
    - Retort Phosphatic Shale Member (1)
    - Unayzah Formation (1)
    - Upper Permian
      - Lopingian
        
        Changhsingian (1)
        
        Wuchiapingian (1)
      - Permian-Triassic boundary (1)
      - Zechstein (1)
  - Road River Formation (1)
  - Silurian
    - Lower Silurian
      - Llandovery
        
        Aeronian (1)
        
        Rhuddanian (1)
  - Taiyuan Formation (1)
  - Tensleep Sandstone (1)
  - upper Paleozoic
    - Bakken Formation (3)
    - Shanxi Formation (1)
  - Woodford Shale (1)
- Phanerozoic (11)
- Precambrian
  - Archean
    - Neoarchean (2)
  - Chuar Group (1)
  - Johnnie Formation (1)
  - upper Precambrian
    - Proterozoic
      - Algonkian
        
        Baraboo Quartzite (2)
      - Mesoproterozoic (8)
      - Neoproterozoic
        
        Doushantuo Formation (1)
        
        Ediacaran (3)
        
        Maranon Complex (1)
      - Ortega Group (1)
      - Paleoproterozoic
        
        Birimian (3)
        
        Orosirian (1)
      - Sinian
        
        Doushantuo Formation (1)
      - Windermere System (1)
igneous rocks
- igneous rocks
  - carbonatites (1)
  - kimberlite (2)
  - plutonic rocks
    - anorthosite (1)
    - diabase (2)
    - diorites