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- Plantae
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geochronology methods
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geologic age
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        Devensian
        
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        Weichselian
        
        upper Weichselian
        
        Younger Dryas (5)
        
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        upper Wisconsinan
        
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        Calvert Formation (4)
        
        Columbia River Basalt Group (4)
        
        Grande Ronde Basalt (1)
        
        lower Miocene
        
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        middle Miocene
        
        Choptank Formation (3)
        
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        Saint Marys Formation (3)
        
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        upper Miocene
        
        Eastover Formation (2)
        
        Messinian (2)
        
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      - Pliocene