.0                                                                              
      SEDIMENTARY ROCKS OF PRE-PENNSYLVANIAN PALEOZOIC AGE                      
                                                                                
             SOUTHERN FRONT RANGE AND WET MOUNTAINS                             
M_     LEADVILLE LIMESTONE (MISSISSIPPIAN), WILLIAMS CANYON LIMESTONE           
         (DEVONIAN), MANITOU LIMESTONE (ORDOVICIAN), AND SAWATCH QUARTZITE      
         (CAMBRIAN)                                                             
MDO    LEADVILLE LIMESTONE, WILLIAMS CANYON LIMESTONE, AND ONE OR MORE          
         ORDOVICIAN FORMATIONS:  FREMONT LIMESTONE, HARDING SANDSTONE, AND      
         MANITOU LIMESTONE                                                      
DO_    WILLIAMS CANYON LIMESTONE, MANITOU LIMESTONE, AND SAWATCH QUARTZITE      
O_     MANITOU LIMESTONE AND SAWATCH QUARTZITE                                  
Or     ONE OR MORE ORDOVICIAN FORMATIONS--Fremont Limestone, Harding            
         Sandstone, and Manitou Limestone                                       
                                                                                
                 WEST-CENTRAL AND SOUTH-CENTRAL                                 
MD     LEADVILLE LIMESTONE (MISSISSIPPIAN), GILMAN SANDSTONE (MISSISSIPPIAN OR  
         DEVONIAN), DYER DOLOMITE (MISSISSIPPIAN? AND DEVONIAN), AND PARTING    
         FORMATION (DEVONIAN, QUARTZITE AND SHALE)                              
O_     ONE OR MORE ORDOVICIAN FORMATIONS (FREMONT LIMESTONE, HARDING            
         SANDSTONE, AND MANITOU DOLOMITE), DOTSERO FORMATION (CAMBRIAN,         
         DOLOMITE; IN WHITE RIVER PLATEAU ONLY), PEERLESS FORMATION (CAMBRIAN,  
         SANDSTONE AND DOLOMITE), AND SAWATCH QUARTZITE (CAMBRIAN)