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88 Chubutiano-Pehuenche transition, but this would leave only 35'-40' for the Pehuenche, which is extremely unlikely, or suppose the presence of a fault, also unlikely as the "arg. fis." extend up the Pehuenche slope in places. In profile AB at least the lower 120' are Chubutiano and at least the upper 135' below the argiles fis. are Pehuenche. The intervening beds are doubtful. I could find neither a typical "Banco verde" nor a typical "Banco negro." The latter may be represented by the thin lens of black clay ? but this is highly uncertain. In any event there is here a series chiefly of clay and sand + without any apparent important break in the lower part of which there are dinosaurs, + in the upper part of which there are no bones. The highest bones are ca. 310' below the arg. fis., the highest bones surely of dinosaurs, ca. 360'. Arg. Fis.: Neither the thickness nor the bedding of the arg. fis. can be determined in section AA ? in at least one place slumping + patchy silicification makes the bedding seem to be at a sharp angle to that of beds above + below, but I am sure this is wrong. It is evident that the thickness is less than along the rim of the Valle Hermoso. In section AB CERRO DEL HUMO 89 280. Lower jaw of Pyrotherium. Profile, p. 81. The exposure is isolated + a small fault, throw ca. 25', may but does not surely pass near by. The jaw is surely from within 15' either above or below the bed marked on profile, not surely defineable more closely. J.H. (G.G.S. coll.). 12/9/30. 1 block, 2 packages. 281. A. Ungulate jaw. 29417 B. Similar, nearby, possibly assoc. 29418 C. 3 incisors in jaw frag, very near B + prob. assoc. 29419 - All from one quarry, level as #279. G.G.S. 12/9/30. 1 block each = 3 blocks. 282. A. Ungulate jaw. 29403 B. Similar jaw. 29421 - From one quarry, not same loc. as 279 or 281 but about same level. See #279. J.H. 12/8/30. 1 block each = 2 blocks. 283. Various teeth, etc. As #279. G.G.S. + C.S.W. 12/9/30. 1 package. 3212 29468-71 284. Broken skull. See profile p.85. Horizon not exactly fixed. At least 30' below "Lower Quarries" and probably more. Very probably the same white tuff as that Marked on profile. J.H. 12/12/30. 28758