Abstract
THE Geological Committee of St. Petersburg has made an important contribution to Russian geology by bringing out a new sheet of the Geological Map of Russia, covering the Southern Urals.2 A volume of explanatory text accompanies the map. It appears from the recent explorations of the members of the Committee that, contrary to the current opinion as to the Southern Urals consisting of a number of chains radiating from Mount Yurma, the great chain consists in its southern parts of a number of chains parallel to-one another, and all running from the south-west to the north-east. The main water-parting is built up of granites, syenites, and gneisses, considerably worn down by denuding forces; it has a steep slope towards the east, where its base disappears beneath the Tertiary deposits, while towards the west it is overlain by thick beds of Devonian, Permian, and Carboniferous deposits, and these strata are so folded as to make several parallel chains rising more than 3300 feet above the sea, and containing the highest summits of the region. Further west the country assumes the character of a plateau which is built up of nearly horizontal strata of the formation—so characteristic of the Urals— which has a fauna intermediate between the Permian and Carboniferous of Western Europe. Above this there are Triassic deposits.
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Geology in Russia1. Nature 40, 403–404 (1889). https://doi.org/10.1038/040403b0
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DOI: https://doi.org/10.1038/040403b0