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      - Mural Limestone (1)
      - Spirit River Formation (1)
    - Middle Cretaceous (2)
    - Upper Cretaceous
      - Cenomanian (2)
      - Elkhorn Mountains Volcanics (1)
      - Gulfian
        
        Austin Chalk (1)
        
        Taylor Marl (1)
      - Kirtland Shale (1)
      - K-T boundary (1)
      - Ojo Alamo Sandstone (1)
      - Senonian (1)
      - Turonian (1)
      - Two Medicine Formation (1)
  - Jurassic
    - Aztec Sandstone (2)
    - Carmel Formation (2)
    - Coast Range Ophiolite (1)
    - Ferrar Group (2)
    - Kirkpatrick Basalt (1)
    - Lower Jurassic
      - middle Liassic (2)
      - Pliensbachian (2)
      - Talkeetna Formation (1)
      - Toarcian (1)
      - Triassic-Jurassic boundary (1)
      - upper Liassic (1)
    - Middle Jurassic
      - Bajocian (3)
      - Bathonian (2)
      - Callovian (2)
    - Upper Jurassic
      - Brushy Basin Member (1)
      - Morrison Formation (1)
      - Oxfordian (2)
      - Portlandian (1)
      - Tithonian (2)
  - Longarm Formation (1)
  - lower Mesozoic (2)
  - Navajo Sandstone (1)
  - Pucara Group (1)
  - Triassic
    - Lower Triassic
      - Permian-Triassic boundary (5)
    - Middle Triassic
      - Ladinian (4)
    - Takla Group (1)
    - Upper Triassic
      - Carnian (5)
      - Chinle Formation (6)
      - Norian (3)
      - Petrified Forest Member (1)
      - Triassic-Jurassic boundary (1)
  - upper Mesozoic (1)
- Paleozoic
  - Cambrian
    - Lower Cambrian
      - Atdabanian (1)
      - Chilhowee Group (1)
      - Shady Dolomite (1)
      - Tommotian (2)
    - Middle Cambrian (5)
    - Mount Read Volcanics (8)
    - Upper Cambrian
      - Furongian (1)
      - Goldenville Formation (1)
  - Carboniferous
    - Lower Carboniferous
      - Dinantian (6)
    - Mississippian
      - Lower Mississippian
        
        Tournaisian
        
        upper Tournaisian (1)
      - Middle Mississippian
        
        Visean
        
        upper Visean (1)
      - Price Formation (1)
      - Stanley Group (1)
    - Namurian (1)
    - Pennsylvanian
      - Middle Pennsylvanian
        
        Atokan
        
        Atoka Formation (1)
        
        Kanawha Formation (1)
      - Upper Pennsylvanian
        
        Kasimovian (1)
        
        Missourian
        
        Rock Lake Shale Member (1)
        
        Stanton Formation (1)
    - Silesian (1)
    - Upper Carboniferous
      - Stephanian (1)
      - Westphalian (1)
  - Devonian
    - Lower Devonian
      - Emsian (1)
    - Middle Devonian
      - Givetian (1)
      - Marcellus Shale (1)
      - Onondaga Limestone (1)
    - Millboro Shale (1)
    - Old Red Sandstone (2)
    - Upper Devonian
      - Famennian
        
        upper Famennian (1)
      - Frasnian (1)
  - lower Paleozoic (4)
  - Ordovician
    - Lower Ordovician
      - Arenigian (3)
      - Tremadocian
        
        Halifax Formation (1)
    - Meguma Group (1)
    - Middle Ordovician
      - Cloridorme Formation (1)
      - Deicke Bentonite Bed (1)
      - Millbrig Bentonite Bed (1)
    - Miramichi Group (1)
    - Tetagouche Group (3)
    - Trenton Group (1)
    - Upper Ordovician
      - Caradocian