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geochronology methods
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geologic age
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    - Upper Jurassic
      - Arab Formation (3)
      - Hanifa Formation (2)
      - Haynesville Formation (1)
      - Kimmeridgian (1)
      - Morrison Formation (1)
      - Oxfordian (1)
      - Portlandian (2)
      - Tithonian (2)
  - lower Mesozoic (4)
  - Moenave Formation (1)
  - Triassic
    - Cordevolian (1)
    - Lower Triassic
      - Bunter
        
        Voltzia Sandstone (1)
      - Permian-Triassic boundary (9)
      - Scythian (2)
    - Middle Triassic
      - Anisian (4)
      - Ladinian (3)
    - Upper Triassic
      - Carnian (8)
      - Keuper (1)
      - Norian (9)
      - Rhaetian (3)
      - Triassic-Jurassic boundary (1)
  - upper Mesozoic (2)
- Paleozoic
  - Berea Sandstone (1)
  - Cambrian
    - Lower Cambrian
      - Tommotian (2)
    - Middle Cambrian
      - Burgess Shale (1)
    - Upper Cambrian
      - Furongian (1)
  - Carboniferous
    - Lower Carboniferous
      - Dinantian (8)
    - Middle Carboniferous (1)
    - Mississippian
      - Barnett Shale (1)
      - Lower Mississippian
        
        Tournaisian
        
        upper Tournaisian (1)
      - Madison Group (1)
      - Middle Mississippian
        
        Visean (4)
      - Upper Mississippian
        
        Serpukhovian (1)
    - Namurian (1)
    - Pennsylvanian
      - Freeport Formation (1)
      - Lower Pennsylvanian
        
        Bashkirian (2)
      - Middle Pennsylvanian
        
        Allegheny Group (1)
        
        Moscovian (3)
      - Upper Pennsylvanian
        
        Cisco Group (1)
        
        Gzhelian (3)
        
        Missourian
        
        Kansas City Group (1)
        
        Lansing Group (1)
    - Upper Carboniferous
      - Westphalian (1)
  - Catskill Formation (1)
  - Devonian
    - Lower Devonian (2)
    - Middle Devonian
      - Mahantango Formation (1)
    - Upper Devonian
      - Famennian (2)
      - Frasnian (3)
  - Geirud Formation (1)
  - Ordovician
    - Lower Ordovician
      - Arenigian (2)
      - Floian (1)
      - Tremadocian (2)
    - Middle Ordovician
      - Darriwilian (2)
    - Skiddaw Slates (1)
    - Upper Ordovician