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Primary terms
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        Ash Hollow Formation (3)
        
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        lower Miocene
        
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        middle Miocene
        
        Choptank Formation (1)
        
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        upper Miocene (6)
        
        Valentine Formation (7)
        
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        upper Pliocene
        
        Rexroad Formation (1)
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        Absaroka Supergroup (1)
        
        middle Eocene
        
        Aycross Formation (1)
        
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        Brule Formation (5)
        
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