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TKa    ANIMAS FORMATION--Arkosic sandstone, shale, and conglomerate; contains   
         abundant volcanic materials; Upper Cretaceous volcaniclastic           
         McDermott Member at base                                               
TKec   TELLURIDE CONGLOMERATE OF EOCENE PREVOLCANIC SEDIMENTARY ROCKS (Te) AND  
         CIMARRON RIDGE FORMATION (UPPER CRETACEOUS, VOLCANIC BRECCIA AND       
         CONGLOMERATE, AGE ABOUT 66 M.Y.)--In northwestern San Juan Mountains   
TKi    LARAMIDE INTRUSIVE ROCKS (AGE 40-72? M.Y.)--Mainly intermediate to       
         felsic compositions; some mafic