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                SEDIMENTARY ROCKS OF JURASSIC AGE                               
                                                                                
Jm     MORRISON FORMATION--Variegated claystone, mudstone, sandstone, and       
         local beds of limestone                                                
Jmj    MORRISON FORMATION AND JUNCTION CREEK SANDSTONE--In Gunnison River area  
         east of wedgeout of all units of Wanakah Formation (Jmw) except the    
         Junction Creek Member                                                  
Jmc    MORRISON FORMATION AND CURTIS FORMATION (GLAUCONITIC SANDSTONE AND       
          LIMESTONE)                                                            
Jmw    MORRISON FORMATION AND WANAKAH FORMATION (SANDSTONE, SHALE, LIMESTONE,   
         AND LOCAL GYPSUM; JUNCTION CREEK SANDSTONE MEMBER AT OR NEAR TOP;      
         PONY EXPRESS LIMESTONE MEMBER AT BASE)