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80 PROFILE AA Brilliantly variegated silicified tuff with some softer tuffaceous clay. Many limonite nodules. Bed- ding obscure, but exposed part not over 40' thick + probably less. (Written sideways: Cerro del Humo. Profile of folded beds on point projecting into valley, due east of apex of Sierra Catillo. No fossils in this part of section. E. 10' dark grey to OBSCURE black clay. 8' chiefly impure yellowish tuff. 12' chiefly fine white X-bedded sandstone Grades laterally into 7' pale variegated sandstone and tuff, much limonite bright variegated W. silicified tuff 9' sombre grey clay. 12' greenish sandstone and gravel with limonite concretions. 45' pinkish or white tuff, lower part finely laminated. 1' gray tuff 18" irregular hard limonitic bed 7' Sandy tuff. Continues on next page.) PROFILE 81 AA, CONT. (Written sideways: Continuation of above. Beds about parallel to those ofsection on previous page. Dip eastward at 20�-25�. W. E. OBSCURE Pink tuff, the exposed parts #276. silicified, very hard, breaking into #277. angular fragments. Bedding not visible. Thickness of R 35 silicified lenses ca. 15' OBSCURE 50' or more Ca 50' yellow, brown, buff and white tuffs, mostly irregular and concretions of arg. Fault, throw ca. 25', visible near here, possibly passes through this point. 5'+ hard bed weathering sombre }280 purplish, yellow, orange, vesicular. Within 15' of Ca. 85' pale concre- this bed, see tionary tuffs. Less note under this massive and with number, p. limonite in upper 89. 15'. Possible Fault OBSCURE)