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70 PROFILE P. Tertiary beds at "Cerro Blanco"- high point SW of Cerro Negro at NE end of Pampa Mar�a Sant�sima. Confined on Base, next page p. 72. #265 15' Light colored hard concretionary tuff. 25' White to yellowish clays. 20' White or pale tuffs, somewhat irregular + with concretionary bands. 5' Light colored hard concretionary tuff 5' Cream-colored clay 4' White tuff. 14' pale pink or greenish impure tuffs 15' Fairly massive grey tuff,some}#262, limonite concretions, upper part etc. impure + grading into above 15' mottled impure tuff with a gen- eral salmon or brownish tone. 20' rather hard tuffs, often greenish, intercalated with yellow nodular clays 35' pale tuffs + clays mostly pink or yellowish. Often with concretions, but not silicified 7' whitish tuffs + clays, locally si- licified + with limonite concretions Top silicified tuff full of concretions. Clays + silicified tuffs, highly variegated. Thick series, bottom not seamless. "CERRO BLANCO" 71 273. 6 notoungulate teeth from a skull found broken up (probably by natives). Profile, p. 73 Same level as #269. GGS 11/25/30. 1 pack. 29411 274. 3 assoc. lower teeth. As #269. GGS 11/29/30. 1 pack. 29410 275. A. Isolated tooth, As #269. B. " armadillo scute, profile p. 73 G.G.S. 11/29/30. 1 pack. 29408-9