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P.220 PUNTA NAVA -From p. 217- 2. The silicified tuff at the SE is the same as the NW argiles fissilaires. In the SE the Notosylopense has been removed by pre- Pyrotheriano erosion (hense the two are uncomformable) & to the NW the Pyrotheriano is removed by pre-Pataganiano erosion. This appears the mpst probable explanation. 3. The non-fossiliferous basal tuffs in the SE are Notosylopense, thinner here (by much) than in the NW, probably but not surely due to pre-pyrotheriano erosion while in the NW the unfossiliferous upper tuffs are Pyrotheriano. This seems not improbable, but evidence is absent. P.221 PUNTA NAVA At the locality of IA fossils are extremely rare, but do occur (unident.) in the 20' of mottled fine tuffs. Ca. 3 km, farther east, fossils are fairly abundant. A section was not taken. C,S.W. furnishes following: At base ca. 20', of silicified tuff, with limonite nodules. Above this 35'-40' of yellowish tuff, bedded and varying in hardness. This contains mammals throughout but richer toward the top (#342). Then follows a massive pinkish tuff of great thickness, very approximately 78'-100'.