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              SEDIMENTARY ROCKS BROADLY CLASSIFIED                              
                                                                                
            Shown in small areas of complex structure                           
                                                                                
Mz     MESOZOIC ROCKS--Mainly Lower Cretaceous, Jurassic, and Triassic          
         formations                                                             
MzPz   MESOZOIC AND PALEOZOIC ROCKS--Mainly as in Mesozoic unit (Mz) plus       
         Permian and Pennsylvanian formations