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commodities
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elements, isotopes
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- isotopes
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    - Hf-177/Hf-176 (2)
    - Mg-26/Mg-24 (2)
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    - O-18/O-16 (2)
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    - Sr-87/Sr-86 (4)
- metals
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    - strontium
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  - hafnium
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  - iron (1)
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    - Pb-207/Pb-204 (2)
  - rare earths
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      - Nd-144/Nd-143 (2)
- noble gases
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- oxygen
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- sulfur
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- trace metals (1)
fossils
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geochronology methods
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geologic age
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        Columbia River Basalt Group (4)
        
        middle Miocene (1)
        
        upper Miocene
        
        Messinian (2)
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    - Paleogene
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        K-T boundary (1)
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- Mesozoic
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- Paleozoic
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        Lodgepole Formation (1)
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  - Ordovician
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  - Permian
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    - Upper Permian
      - Zechstein (1)
    - Whitehill Formation (2)
  - Silurian
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  - upper Paleozoic
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- Phanerozoic (3)
- Precambrian
  - Archean (29)
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  - upper Precambrian
    - Proterozoic
      - Huronian
        
        Onaping Formation (1)
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igneous rocks
- igneous rocks
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  - plutonic rocks
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    - ultramafics
      - peridotites
        
        harzburgite (1)
        
        lherzolite (1)
        
        spinel lherzolite (1)
        
        spinel peridotite (1)
      - pyroxenite (1)
  - volcanic rocks
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    - basalts
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      - ocean-island basalts (3)
    - basanite (2)
    - pyroclastics
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      - tuff (2)
    - rhyolites (1)
- ophiolite (4)
- pyrolite (2)
metamorphic rocks
- metamorphic rocks
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  - gneisses
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    - paragneiss (1)
  - granulites (5)
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  - metaigneous rocks
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    - serpentinite (2)
  - metasedimentary rocks
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  - schists
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minerals
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- halides
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- minerals (1)
- native elements
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- oxides
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- phosphates
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- silicates
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        enstatite (1)
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        opal-CT (1)
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  - orthosilicates
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        olivine (7)
        
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        wadsleyite (3)
  - sheet silicates
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- sulfates
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Primary terms
- absolute age (8)
- Africa
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  - East Africa
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