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| Keywords: The Quarterly journal of the Geological Society of London (13369412104).jpg 454 <br> PROCEEDINGS OF THE GEOLOGICAL SOCIETY May 28 <br> general deepening of the bed of the river of the denudation by it of <br> its own alluvium and also of a change in character of the fan- <br> streams from accumulators to denuders ; and this will now be brought <br> forward <br> First comes what must be a rare case ; for I have met with only <br> one instance of it High up the Indus valley on the right bank <br> close to the Chinese frontier is a fan which spreads on to the allu- <br> vial flat and has not been cut into by the great river ; its slope is 4° its <br> radius 1 mile ; in this fan is a gully which originates by the mouth <br> of the ravine from which the fan spreads and continuing on gets to <br> a depth of 70 feet ; but it dies away altogether as the fan meets <br> the plain At the time I was there being summer the ravine <br> and gully were perfectly dry; but the gully must have been <br> made by the same stream that produced the fan which therefore <br> had changed from an accumulator to a denuder without the extra- <br> neous cause of the formation of a cliff and without any similar <br> change on the part of the main river to which it was tributary <br> Our next set of cases depend on the main river having lowered <br> its bed having cut through beds of alluvium formed by itself <br> These again with reference to the fans divide themselves into two <br> kinds ” the first where though the main stream has become a de- <br> nuder the fan-stream has remained an accumulator; the second <br> where the fan-stream no longer accumulates material The sketch <br> fig 10 illustrates the former class of cases and at the same time <br> Fig 10 ” Triple Fan three miles above Tsotu Changchenmo Ladakh <br> represents a beautiful instance of the compound fan ; I did not bring <br> it forward before only because the case is complicated by the cir- <br> cumstances we have now to consider A careful look at the sketch <br> which is of a fan in the Changchenmo valley will enable one to <br> to make out these details ” The dark horizontal shading at a and <br> that corresponding to it on the left is alluvium of the main stream ; <br> it continues far below as well but is there hidden by fallen stuff 39051392 120601 51125 Page 454 Text v 29 http //www biodiversitylibrary org/page/39051392 1873 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 29 1873 Geology Periodicals Smithsonian Libraries bhl page 39051392 dc identifier http //biodiversitylibrary org/page/39051392 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-24 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13369412104 2015-08-26 10 50 12 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1873 Photos uploaded from Flickr by Fæ using a script | ||||
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