1st April 1835

Mendoza to Santiago (Day 15) – Estancia of Uspallata
... we crossed the Uspallata range of mountains; these correspond in their position & probably in their age to the Portillo range, but are of very inferior height. They are separated from the main range by a level plain of the same appearance & nature as those basins described in Chili. On this barren plain which has an altitude of nearly 6,000 ft are the houses of the Estancia of Uspallata. We slept here at night; it is the custom house & the last inhabited place on this side of the Cordillereas. The Uspallata mountains are deficient in water & quite barren; on the road shortly before reaching the plain there is a very extraordinary view; there are quite white, red, purple & green sedimentary rocks & black Lavas; these strata are broken up by hills of Porphyry of every shade of Brown & bright Lilacs. All together they were the first mountains which I had seen which literally resembled a coloured Geological section.

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