.0                                                                              
                                                                                
                                                                                
                            NORTHWEST (Continued)                               
Twc     Cathedral Bluffs Tongue--Claystone, mudstone, and sandstone; in Sand    
          Wash basin                                                            
Twn     Niland Tongue--Mudstone, sandstone, and carbonaceous shale; in Sand     
          Wash basin                                                            
Two    WASATCH FORMATION (INCLUDING FORT UNION EQUIVALENT AT BASE) AND OHIO     
         CREEK FORMATION--Claystone, mudstone, sandstone, and conglomerate      
Tf     FORT UNION FORMATION--Shale, sandstone, and local coal beds              
Tc     COALMONT FORMATION--Arkosic sandstone, conglomerate, and shale; coal in  
         lower part; in North Park                                              
Tm     MIDDLE PARK FORMATION EXCLUSIVE OF WINDY GAP MEMBER--Arkosic sandstone   
         and conglomerate containing abundant volcanic materials.  Arbitrary    
         line between Middle Park and Coalmont Formations is at Continental     
         Divide.  These Formations are not divided on digital version           
                                                                                
                          SOUTH-CENTRAL                                         
Td     DRY UNION FORMATION--Siltstone, sandstone, and conglomerate.  Includes   
         Wagontongue Formation (Miocene) in South Park                          
Ts     SANTA FE FORMATION--Siltstone, sandstone, and conglomerate               
Tos    OLIGOCENE SEDIMENTARY ROCKS--Includes Florissant Lake Beds (tuffaceous   
         shale and tuff) and Antero Formation (limestone, tuff, tuffaceous      
         sandstone, and conglomerate)                                           
Te     EOCENE PREVOLCANIC SEDIMENTARY ROCKS--Arkosic sand and bouldery gravel   
         of Echo Park Alluvium                                                  
Tsp    SOUTH PARK FORMATION--Arkosic sandstone and shale, volcaniclastic        
         conglomerate, and andesite flows and breccia                           
                                                                                
                            SOUTHWEST                                           
Tlp    LOS PINOS FORMATION--Volcaniclastic conglomerate interbedded with        
         basalt flows of Hinsdale Formation (Tbb) on east flank of San Juan     
         Mountains. Grades laterally into Santa Fe Formation of San Luis Valley 
Tos    OLIGOCENE SEDIMENTARY ROCKS--Includes Creede Formation (tuffaceous       
         siltstone, sandstone, conglomerate) and gravels interbedded with       
         volcanic rocks northeast and southeast of Gunnison                     
Tsj    SAN JOSE FORMATION--Siltstone, shale, and sandstone                      
Te     EOCENE PREVOLCANIC SEDIMENTARY ROCKS--Includes Telluride Conglomerate    
         and Blanco Basin Formation (arkosic mudstone, sandstone, and           
         conglomerate)                                                          
Tn     NACIMIENTO FORMATION--Shale and sandstone