.0 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