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120 In Lote 18, to the north of here, is exposed the upper part of the Pehuenche, red ss. + pale clays as elsewhere. No arg. fis. Above this pinkish to white tuffs, with a few fossils (#415). Above these a series of thin bedded very fissile clays, sandy clays, + fine sands, yellow in general tone, a type of sediment not so far seen elsewhere. The bedding on the whole is very regular and horizontal and such irregularities as exist seem due to compression. Apparently a lake series. We split many pieces but found no organic traces. 381 121 382 383 IN 384 BOOK TWO 385 386 387 388 389