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elements, isotopes
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  - stable isotopes
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- metals
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fossils
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geochronology methods
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geologic age
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        Neapolitan Yellow Tuff (2)
        
        Weichselian
        
        upper Weichselian
        
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        Wisconsinan
        
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  - Stone Age
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        Peach Springs Tuff (1)
        
        upper Miocene
        
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    - Paleogene
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igneous rocks
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metamorphic rocks
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meteorites
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minerals
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