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| Keywords: The Quarterly journal of the Geological Society of London (13369170803).jpg 1873 <br> DREW UPPER-INDUS BASIN <br> 453 <br> towards e marks the new or secondary fan projecting in front of the <br> cliff' b <br> As it is always satisfactory to refer to actual cases I annex a <br> sketch fig 9 taken in the Changchenmo valley the altitude of <br> Fig 9 � Fan cut into by the River ivith secondary Fan formed in <br> front four miles south of Pamzalan Changchenmo Ladakh <br> which is 15 000 feet of a compound fan which is a fair example of <br> the action which I have been describing <br> It is likely that the cutting of a notch in the cliff begins early in <br> the formation of the cliff; but it is not likely to become the per- <br> manent bed of the stream until the cliff has been worked a good <br> way back One often sees many such notches at the end of gullies <br> now dry that once held a stream but we must also remember that <br> there is a tendency of the waters to separate; so that only part may <br> have gone to produce them ; it is not until the denudation of the <br> gully has gone back to the gorge that the course and the holding <br> together of the waters are determined for the future It may be <br> remarked that there is no instance as far as I know of more than <br> one deep gully leading from the cliff to the mouth of the ravine <br> although as in some of the fans opposite Pitak near Leh small <br> secondary fans project from several of the radiating water-courses <br> without the gully having been denuded far back <br> Thus far we have dealt with cases in which neither the fan- <br> stream nor the mountain has had any tendency of itself to lower its <br> bed ; for in the last instances the fan-stream would not have cut <br> through its bed but for the accident of the river by its side action <br> making a cliff which necessitated a readjustment of the slope of the <br> bed of the ravine But we often enough meet with evidence of the 39051391 120601 51125 Page 453 Text v 29 http //www biodiversitylibrary org/page/39051391 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 39051391 dc identifier http //biodiversitylibrary org/page/39051391 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 N02/13369170803 2015-08-26 10 56 03 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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