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elements, isotopes
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fossils
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geochronology methods
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geologic age
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  - Quaternary
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    - Pleistocene
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      - upper Pleistocene
        
        Lisan Formation (1)
        
        Weichselian
        
        upper Weichselian
        
        Younger Dryas (1)
        
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        Wurm (1)
  - Tertiary
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    - Neogene
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        Crater Flat Tuff (2)
        
        lower Miocene
        
        Aquitanian (2)
        
        middle Miocene (2)
        
        Oakville Sandstone (1)
        
        Temblor Formation (1)
      - Pliocene
        
        upper Pliocene (1)
    - Paleogene
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        Green River Formation (1)
        
        lower Eocene
        
        Cuisian (1)
        
        Sparnacian (1)
        
        Ypresian
        
        London Clay (1)
        
        upper Eocene
        
        Jackson Group (3)
        
        Shubuta Member (1)
        
        Twiggs Clay (1)
        
        Yazoo Clay (1)
      - Hanna Formation (1)
      - Oligocene
        
        Creede Formation (1)
        
        Fontainebleau Sandstone (1)
        
        lower Oligocene (1)
        
        upper Oligocene (1)
      - Paleocene
        
        lower Paleocene
        
        Danian (3)
        
        upper Paleocene (1)
      - Paleocene-Eocene Thermal Maximum (1)
      - Wasatch Formation (1)
    - Shahejie Formation (2)
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- Coal Measures (1)
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- Mesozoic
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    - Lower Cretaceous
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    - Upper Cretaceous
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        lower Cenomanian (1)
      - Fox Hills Formation (1)
      - Gulfian
        
        Eagle Ford Formation (3)
      - Holz Shale (1)
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      - Maestrichtian (2)
      - Niobrara Formation (2)
      - Pierre Shale (2)
      - Rosario Formation (1)
      - Senonian (1)
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      - Turonian
        
        upper Turonian (1)
      - Williams Fork Formation (1)
  - Jurassic
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    - Lower Jurassic
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        Brent Group (1)
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  - Triassic
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      - Permian-Triassic boundary (7)
    - Middle Triassic (3)
    - Montney Formation (1)
    - Upper Triassic (2)
  - upper Mesozoic
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  - Yanshanian (1)
- Moldanubian (3)
- Paleozoic
  - Cambrian
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    - Lower Cambrian (8)
    - Middle Cambrian
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      - Metaline Limestone (1)
    - Mount Read Volcanics (2)
    - Upper Cambrian (2)
  - Carboniferous
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    - Mississippian
      - Lower Mississippian
        
        Tournaisian
        
        upper Tournaisian (1)
      - Middle Mississippian
        
        Visean
        
        upper Visean (1)
      - Upper Mississippian
        
        Serpukhovian (1)
    - Namurian (2)
    - Pennsylvanian
      - Freeport Formation (2)
      - Joggins Formation (1)
      - Kittanning Formation (1)
      - Lower Pennsylvanian
        
        New River Formation (1)
        
        Pocahontas Formation (1)
      - Middle Pennsylvanian
        
        Allegheny Group (2)
        
        Kanawha Formation (1)
      - Monongahela Group (1)
      - Pittsburgh Coal (1)
      - Upper Pennsylvanian
        
        Gzhelian (1)
    - Upper Carboniferous
      - Westphalian (2)
  - Chattanooga Shale (1)
  - Devonian
    - Genesee Group (1)
    - Lower Devonian
      - Dittonian (1)
      - Lochkovian (1)
    - Middle Devonian
      - Givetian (3)
      - Hamilton Group (1)
      - Marcellus Shale (2)
    - Old Red Sandstone (1)
    - Popovich Formation (2)
    - Slave Point Formation (1)
    - Upper Devonian
      - Famennian
        
        upper Famennian (1)
      - Frasnian (6)
      - Palliser Formation (1)
    - Waterways Formation (1)
  - Earn Group (1)
  - Exshaw Formation (1)
  - lower Paleozoic (7)
  - New Albany Shale (2)
  - Ordovician
    - Lower Ordovician
      - Beekmantown Group (1)
      - Saint George Group (1)
    - Meguma Group (1)
    - Middle Ordovician
      - Llanvirnian (1)
      - Platteville Formation (1)
      - Winnipeg Formation (2)
    - Trenton Group (1)
    - Upper Ordovician
      - Ashgillian (1)
      - Caradocian
        
        Borrowdale Volcanic Group (1)
      - Hirnantian (2)
      - Lorraine Group (1)
      - Trentonian (1)
      - Wufeng Formation (3)
    - Utica Shale (1)
  - Permian
    - Castile Formation (1)
    - Guadalupian
      - Capitanian (1)
    - Longtan Formation (1)
    - Lower Permian
      - Wolfcampian (2)
    - Lyons Sandstone (1)
    - Maokou Formation (1)
    - Upper Permian
      - Lopingian (1)
      - Permian-Triassic boundary (7)
      - Zechstein (1)
  - Silurian
    - Lower Silurian
      - Wenlock (1)
    - Middle Silurian
      - Roberts Mountains Formation (2)
    - Niagaran (1)
    - Sangerville Formation (1)
    - Upper Silurian
      - Ludlow (2)
    - Waterville Formation (1)
  - upper Paleozoic (3)
- Phanerozoic (5)
- Precambrian
  - Archean
    - Blake River Group (1)
    - Mesoarchean (2)
    - Neoarchean (11)
    - Paleoarchean (2)
    - Swaziland Supergroup (1)
    - Timiskaming Group (1)
    - Yellowknife Group (1)
  - Central Rand Group (5)
  - Fortescue Group (2)
  - Lewisian Complex (1)
  - Pongola Supergroup (1)
  - Transvaal Supergroup (3)
  - upper Precambrian
    - Proterozoic
      - Bambui Group (1)
      - Banxi Group (1)
      - Great Oxidation Event (7)
      - Huronian
        
        Onaping Formation (1)
      - Malmani Subgroup (1)
      - McNamara Group (1)
      - Mesoproterozoic
        
        Belt Supergroup (2)
        
        Gawler Range Volcanics (1)
        
        Laxfordian (1)
        
        Newland Limestone (2)
      - Negaunee Iron Formation (1)
      - Neoproterozoic
        
        Cryogenian (2)
        
        Dengying Formation (3)
        
        Doushantuo Formation (1)
        
        Ediacaran (14)
        
        Marinoan (3)
        
        Nantuo Formation (1)
        
        Riphean
        
        upper Riphean (1)
        
        Sturtian (2)
        
        Vendian (4)
      - Paleoproterozoic
        
        Birimian (3)
        
        Orosirian (1)
        
        Urquhart Shale (2)
      - Roan Supergroup (1)
      - Sinian