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elements, isotopes
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geochronology methods
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geologic age
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        Devensian
        
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        Wurm (1)
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  - Tertiary
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      - Miocene
        
        Columbia River Basalt Group (3)
        
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        lower Miocene (1)
        
        middle Miocene
        
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        upper Miocene
        
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        lower Pliocene (1)
        
        upper Pliocene (3)
    - Paleogene
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        lower Eocene
        
        Cuisian (1)
        
        Hatchetigbee Formation (1)
        
        Thebes Formation (1)
        
        Ypresian
        
        London Clay (9)
        
        middle Eocene
        
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        Bartonian (1)
        
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        upper Eocene (4)
      - Oligocene
        
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        Frio Formation (4)
        
        lower Oligocene (2)
      - Paleocene
        
        Clayton Formation (1)
        
        lower Paleocene
        
        Danian (5)
        
        K-T boundary (9)
      - Paleocene-Eocene Thermal Maximum (1)
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    - upper Tertiary (1)
  - Tulare Formation (1)
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- Mesozoic
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    - Lower Cretaceous
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    - Upper Cretaceous
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      - Greenhorn Limestone (1)
      - Gulfian
        
        Eagle Ford Formation (4)
      - Hell Creek Formation (1)
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      - K-T boundary (9)
      - Ladd Formation (1)
      - Maestrichtian
        
        upper Maestrichtian (2)
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  - Jurassic
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    - Middle Jurassic
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        Brent Group (1)
        
        Ness Formation (1)
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    - Opalinus Clay (3)
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    - Upper Jurassic
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      - Entrada Sandstone (1)
      - Haynesville Formation (4)
      - Kimmeridge Clay (5)
      - Kimmeridgian (3)
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      - Stump Formation (1)
  - Moenave Formation (1)
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  - Triassic
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      - Panchet Series (1)
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    - Middle Triassic
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    - Upper Triassic
      - Mercia Mudstone (2)
      - Rhaetian (1)
      - Yanchang Formation (1)
- MIS 5 (2)
- Paleozoic
  - Berea Sandstone (2)
  - Cambrian
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    - Upper Cambrian
      - Wilberns Formation (1)
  - Carboniferous
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    - Mississippian
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      - Lower Mississippian
        
        Kinderhookian (1)
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      - Middle Mississippian
        
        Visean (1)
    - Pennsylvanian
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        Morrowan (1)
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        Desmoinesian
        
        Cherokee Group (1)
      - Morrow Formation (1)
      - Pottsville Group (2)
  - Devonian
    - Middle Devonian
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    - Old Red Sandstone (2)
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  - lower Paleozoic (2)
  - Ordovician
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      - Bromide Formation (1)
    - Upper Ordovician
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      - Caradocian
        
        Borrowdale Volcanic Group (1)
  - Permian
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    - Lower Permian
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        Bone Spring Limestone (1)
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    - Phosphoria Formation (1)
    - Upper Permian
      - Permian-Triassic boundary (1)
  - Silurian
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    - Upper Silurian
      - Ludlow (1)
  - Woodford Shale (1)
- Precambrian
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  - Archean
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  - upper Precambrian
    - Proterozoic
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      - Neoproterozoic
        
        Ediacaran (2)
        
        Torridonian (1)
igneous rocks
- igneous rocks
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  - volcanic rocks
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    - pyroclastics
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      - tuff (6)
    - rhyolites (1)
- ophiolite (3)
- volcanic ash (2)
metamorphic rocks
- metamorphic rocks
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