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- phase equilibria (21)
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- placers (4)
- Plantae
  - algae (3)
- plate tectonics (4)
- Precambrian
  - Archean
    - Mesoarchean (1)
    - Neoarchean (1)
    - Sausar Series (1)
  - Biwabik Iron Formation (1)
  - Gunflint Iron Formation (1)
  - upper Precambrian
    - Proterozoic
      - Bambui Group (1)
      - Lewisian (1)
      - Negaunee Iron Formation (2)
      - Neoproterozoic
        
        Cryogenian (1)
        
        Dengying Formation (1)
        
        Doushantuo Formation (2)
        
        Ediacaran (1)
        
        Torridonian (1)
      - Paleoproterozoic
        
        Aphebian