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P176, Remarks, Lomas Blancas This region is one very much disturbed by faults and slips, so that only a general idea of the succession can be obtained. The essential point is the presence between the clay-white sandstone series and the Patagoniano tuff of a relatively then series of terrotrial tuffs. These are very massive, appear to be absolutely concordant. They have a thickness of 100'-150', hard to determine because of the structure & frequent slips on the underlying clays. The accompanying simple sections of this part of the series were taken independently about 3 km. Apart. We saw no signs of Pyrotherium beds. P177 CERRO REDONDO 326. Misc, mams & crocs. Profile p179. Part in place (as marked in package) & part on surface but at exactly same horizon & locality. C.S.W. O.G.F. 3/29/31 1 package 28431, 28505, 29101, 16453 croc., 16454croc. 327. Misc. mamm. Top of cerroj p178 G.G.S. 3/29/31. 1 package. 29100