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98 PROFILE BB Generalized section about 5kms. E. of BA. (Written sideways: PAMPA Vertical PELADA scale Rodados, cemented = Tehuelche of Ameghino. Tertiary tuffs, surface for the most part obscured + Shown too proper exposures few high, should and discontinuous. Feet be this LATERAL Tertiary Tuffs height HANGING and Clays, VALLEYA Good Exposures RECENT [Details, Section BC] S. Occasional Small Faults or slips. N. C B Ca. 100' Grey shale, often weathering yellow- R50ish or reddish, with frequent siliceous concretions. Bedding not visible. Lenses of white x-bedded ss. in lower 20' 50'+ White to brick-red x-bedded coarse ss. finer ss. and sandy shale. POSSIBLE Bottom of Local Exposure (not base of Formation). FAULT ZONE A ? Approximate level, highest bed with Notostylops identifiable fossils, B ? Lowest mammal bones in place. [Not in this section] C ? Lowest identifiable Notostylops fauna. No fossils observed below B.)