Forestry in the Mining Districts of the Ural Mountains in Eastern Russia
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Judging THE UEAL MOUNTAINS. 73 from its composition — it is entirely made up of fragments of ancient XJralian rocks— the great Permian deposit must have been accumulated, not only after the completion of the Silurian, devonian, and carboniferous systems, but after their consolidation, and either after or during their mineralisation with copper ores. This is a clear and undeniable conclusion, at which the field-geologist who has examined this region arrives ; for, in whatever parallel of latitud...e he may trace this ancient detritus, he invari- ably finds it to be more coarse and metalliferous as it approaches the mountains from which its materials have been derived, whilst in receding from them, such mineral matter (always in the form of deposit, and never in the condition of veins) as regularly dies away and is lost in marine marls, sand, and limestone. But if the Ural mountains were, as we contend they must have been, the source whence all these cupriferous sediments, as well as detritus and fossil vegetables, were supplied, very different indeed must have been their former outline from that which now prevails ; for on the western slope of the axis down which the waters now flow into Permia, there are no great vein-stores and original sources from which such dibris could have been derived.
What to read after Forestry in the Mining Districts of the Ural Mountains in Eastern Russia?
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To quickly assess the difficulty of the text, read a short excerpt:
Judging THE UEAL MOUNTAINS. 73 from its composition — it is entirely made up of fragments of ancient XJralian rocks— the great Permian deposit must have been accumulated, not only after the completion of the Silurian, devonian, and carboniferous systems, but after their consolidation, and either after or during their mineralisation with copper ores. This is a clear and undeniable conclusion, at which the field-geologist who has examined this region arrives ; for, in whatever parallel of latitud...e he may trace this ancient detritus, he invari- ably finds it to be more coarse and metalliferous as it approaches the mountains from which its materials have been derived, whilst in receding from them, such mineral matter (always in the form of deposit, and never in the condition of veins) as regularly dies away and is lost in marine marls, sand, and limestone. But if the Ural mountains were, as we contend they must have been, the source whence all these cupriferous sediments, as well as detritus and fossil vegetables, were supplied, very different indeed must have been their former outline from that which now prevails ; for on the western slope of the axis down which the waters now flow into Permia, there are no great vein-stores and original sources from which such dibris could have been derived.
What to read after Forestry in the Mining Districts of the Ural Mountains in Eastern Russia?
You can find similar books in the "Read Also" column, or choose other free books by Brown, John Croumbie. Comp to read onlineMoreLess
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