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       SEDIMENTARY ROCKS OF PERMIAN AND PENNSYLVANIAN AGE                       
                                                                                
P&f    FOUNTAIN FORMATION--Arkosic sandstone and conglomerate                   
P&cf   CASPER FORMATION (SANDSTONE) AND LOWER PART OF FOUNTAIN FORMATION        
P&if   INGLESIDE FORMATION (LIMESTONE AND CALCAREOUS SANDSTONE) AND FOUNTAIN    
         FORMATION