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94 of very gentle earth movements between the Notostylopense and the Pyrotheriense. Then there was fairly strong folding sometime after the Pyrotheriense. So far as I know, none of these beds have ever been found resting with angular uncon- formity on the Creataceous, + here they are all found folded equally. Supposed exception, Arg. fis.- Notostylops not visible here any more than at other localities already discussed. DEC. 14, 1930 95 EXCURSION TO BUEN PASTO From Camp at Cerro del Humo south to junction of Sarmiento-Laguna de los Palacios and Sarmiento-Buen Pasto roads, then along latter to Buen Pasto + return, same route. From the junction of the roads to about 10 km. from Buen Pasto the way is on Chubutiano all The time section given by Feruglio. On the heights just before the descent into the Bajo de Buen Pasto, there are several very small and isolated exposures visible from the road, on both sides. One of these is lithologically similar to the arg.fis. Another, above and nearby, is of tuffs lithologically similar to the Tertiary series. Others resemble the latter and contain unidentifiable fragments of bone. Beyond indicating the probable presence of Tertiary at this elevated point, the exposures have no paleontological or stratigraphic value.