'; ?>
click to enlarge
P. 198 W. END OF PAMPITA DE LA LOMA REDONDA This pampita is the small plateau that extends westward from the Estancia Hansen. At its western end almost due NW of Los Melligos and about 4-1/2 kilometers W. & slightly N. of the Estancia Hansen the "Pehuenche" is well exposed. A simplifies section is given in Profile FC, P. 193. The essential features, in descending order are as follows: At the top, rodados of course, & thin lenses of yellowish tuff, perhaps the base of an eroded series. About 50' of sandstones & clays. Near the top hard grey X-bedded ss. Such as that with mammals at Las Violetas: R 144. The sands in general are grey to bright red:R 143. Some of the intercolated clays are thin bedded & fissile. At or near the base of this series in some places is black clay: R 142. About 90' pf grey-green sands:R 140 & sandy tuffs almost identical in character with those at Las Violetas, likewise with pebbles of pumice, etc. The "Arg. Fis." Is lacking except that the P.199 Top of the grey-green is hardened & weathers brown & testicular: R 141, and that another similar thin (app'ly lenticular) bed is intercolated in the grey-green below. 15' yellowish sand and grey clay, with many fibrous radiating concretions near the base. 10'+-Fairly typical Banco Negro Banco Verde. The chief importance of this section is as intermediate between Las Violetas & Las Tortugas (see p. 193). It is strongly suggestive of equivalence as shown, which would seems to lend to the very important conclusion that the "Pehuenche" above the upper black clay at Las Tortugas is equivalent to the "Eocene" of Las Violetas.