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fossils
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geochronology methods
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geologic age
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        lower Eocene
        
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        middle Eocene
        
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        upper Eocene
        
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- Mesozoic
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    - Upper Cretaceous
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        Brent Group (1)
    - Opalinus Clay (1)
    - Upper Jurassic
      - Hanifa Formation (2)
      - Haynesville Formation (1)
      - Kimmeridgian (1)
      - Oxfordian (1)
      - Sundance Formation (1)
  - Triassic
    - Lower Triassic
      - Permian-Triassic boundary (1)
    - Montney Formation (1)
    - Sherwood Sandstone (1)
    - Upper Triassic
      - Triassic-Jurassic boundary (1)
      - Yanchang Formation (1)
  - Vaca Muerta Formation (1)
  - Yanshanian (1)
- Moldanubian (1)
- Paleozoic
  - Arbuckle Group (1)
  - Berea Sandstone (1)
  - Cambrian
    - Middle Cambrian
      - Flathead Sandstone (1)
    - Upper Cambrian
      - Mount Simon Sandstone (1)
  - Carboniferous
    - Chilliwack Group (1)
    - Mississippian
      - Barnett Shale (2)
      - Upper Mississippian
        
        Hartselle Sandstone (1)
    - Pennsylvanian
      - Lower Pennsylvanian
        
        Haymond Formation (1)
      - Morrow Formation (1)
  - Devonian
    - Lower Devonian
      - Shap Granite (1)
    - Middle Devonian
      - Givetian (1)
      - Marcellus Shale (3)
    - Old Red Sandstone (3)
    - Slave Point Formation (1)
    - Thirtyone Formation (2)
    - Upper Devonian
      - Famennian (1)
      - Frasnian (1)
  - lower Paleozoic
    - Cape Phillips Formation (1)
    - Penobscot Formation (1)
  - Ordovician
    - Lower Ordovician
      - Ellenburger Group (1)
    - Majiagou Formation (1)
    - Trenton Group (1)
    - Upper Ordovician
      - Wufeng Formation (2)
    - Utica Shale (1)
  - Permian
    - Khuff Formation (2)
    - Lower Permian
      - Qixia Formation (1)
    - Middle Permian (1)
    - Upper Permian
      - Permian-Triassic boundary (1)
  - Rangeley Formation (1)
  - Silurian
    - Lower Silurian (2)
    - Niagaran (1)
  - upper Paleozoic
    - Bakken Formation (1)
- Phanerozoic (4)
- Precambrian
  - Archean
    - Gilman Formation (1)
    - Mesoarchean (1)