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P. 208 mammals in its upper part, sometimes also at other levels down to its base. 3. Pale clays 100'+, gray- greenish or yellowish, less often pink with a lesser amount of intercolated sandstones, x- bedded, fine to coarse, sometimes well cemented. These sandstones, generally white to grey rarely pink or reddish, contain mammals, although local, rare, and poorly preserved. 4. A series (unmeasured) predominantly sandy but with much clay also, often brightly colored. The lower part is usually more argillaceous & often has a black clay (true banco negro) at its base. The upper part is formed by a thick (100' or more) sandstone to fine conglomerate with rather rare intercolated clays, usually brick red but also containing white and green lenses. This whole series appears barren. There are various not well-authenticated reports of finding dinosaurs in it. The most clearly circumstantial is a bone, clearly dinosaur, in the possession of Rossbach of the Y. P. F. which he says was given him by the late R, Wichmann as coming from the surface between Pico Salamanca & Punto Vissor. Suggestive but not direct enough to be certain. On the other hand mammal bones, otherwise unidentifiable, were found at sea level near section GB, apparently, but not surely in place. Until more definite finds are made, the series must be considered barren or essentially so. P 209 5. The Salamanqueano, marine, terminating above with typical
. As to the relations between these beds; between 4 & 5 the transition is sharp but parallel as elsewhere between Banco Verde & Banco Negro. Between 3 & 4 an uncomformity of erosion can be seen in some places, as profile GB. This may be regional, although it cannot certainly be given more importance than the numerous local uncomformities of series 4. The contact of 2 & 3 is generally sharp but sometimes rather blended & so far as observed everywhere without positive evidence of uncomformity. The series 2 is conformable within itself. The series can only be divided subjectively, as one bed grades perfectly into another. It is probably all of nearly the same age as the fossils from its middle and lower part (i.e. Watestylefonse on field determinations). Inasmuch as Wotost & Pyroth. Are always sharply separated by an erosion plane or alteration is exact type of sediment where both are proven to be present, it is highly unlikely that the barren massive upper part is of Pyrotherium age. The contact of 1 & 2 is uncomformable but plane and parallel, as elsewhere.