National Geologic Map Database
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                Title: Impure K-bentonite beds from the Lexington Limestone and the Point Pleasant Formation (Middle Ordovician) of northern Kentucky and southwestern Ohio
 
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                Author(s): Schumacher, G.A., and Carlton, R.W.
            
 
        
        
            
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                    Publishing Organization: Duke University Press
            
 
            
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                Series and Number: Southeastern Geology v. 32, no. 2 [p. 83-105]
            
 
            
        
        
            - Publication Date: 1991
 
        
        
            - Cross Section: None
 
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.