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116 -But the difference is only between a deeper phenomenon influencing the underlying beds also and a more shallow, influencing the tuffs only. In either case the result is the same so far as the actual exposures are concerned. It must be inferred that the beds of the other slope have moved down relative to those of the inner. Hence the total thickness from the contact with the clay to the top of the tuff series here present was less than the actual elevation between the clay contact (at the base of the outer slope) + the rodado contact (at the top of the inner), nearly 400' Some beds must be repeated in the two slopes at different elevations. There is no geologic evidence for this as the exposures of the inner, pampa, slope are so poor. Even fossils from the inner slope would not solve the question perhaps as the Notostylopense is here so thick and without faunal differences over great thicknesses so far as seen in the field. This phenomenon and also the lesser faults and the true obvious slumping along the tuff-clay contact have been taken into consideration and the sections and fossil records are of continuous slopes without repetition or omission of beds. 363 117 364 365 IN 366 BOOK TWO 367 368 369 370 371