Dakota in hogback between Messidorz and Blue Mt. Chieflly > single ss, cqltc lzyer on top, cqltc in basal part. Nothing but clstn in cuon below but beds immediately under SS are menthod, Lozily lzyer Clf pebble cgl. Mowry SS, cqltc tu wash / vavegatal basal pvt cover claystone South toward Blue Mt. the "Dakota" hogback becomes a double unit. Suspect that at loc. depicted in Sketch the two ss have coalesced. Exposures all along this extensive hogback are good and afford basis for find "two dimensional" study. 19