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| Keywords: The Quarterly journal of the Geological Society of London (12645927923).jpg 342 <br> PROCEEDINGS OP THE GEOLOGICAL SOCIETY <br> Apr 1 <br> which induced the change Julpigoree where the alteration took <br> place is 200 feet above the level of the river at its mouth and it <br> flows for the first forty or fifty miles with a fall of 3 feet per mile ; for <br> a like distance further on the fall is 2 feet and the slope gradually <br> sinks to 6 inches or it may be less ; but nowhere is it a depositing <br> river or consequently influenced by back-waters ; and it therefore <br> appears to have been merely an accident which caused the change <br> though being so it is as likely to go back any day as to remain in <br> its present position <br> 10 Retrocession of the Junctions of tributary Streams iviih main <br> Rivers There still remains one class of phenomena to which I must <br> direct attention before concluding namely the shifting upwards of <br> all the mouths of the tributaries of the Ganges along the main <br> stream This is perhaps the most generally interesting of the <br> alterations that are taking place not only from the magnitude of the <br> changes it superinduces but because of its forming the best chrono- <br> metric scale for estimating the extension of the delta and the recent <br> sequence of events <br> Although I am not aware that they have been anywhere alluded <br> to before the causes that lead to the changes appear to be tolerably <br> obvious when pointed out <br> In order however to make myself perfectly understood let me <br> first refer to what I said about secular elevation in an early part of <br> this paper and then assume two hypothetical cases which I trust <br> will make the matter quite clear <br> First let me assume hypothetically that the Ganges from Allahabad <br> to Rajmahal was a perfectly horizontal canal or arm of the sea run- <br> ning due east and west It is evident that the slope formed by the <br> rivers bringing down detritus from the hills on the north and south <br> would dip north and south but their plains would equally be hori- <br> zontal in a direction east and west and consequently that all the <br> Figs 3-6 Diagrams illustrating the Junctions of tributary Streams <br> with Main Rivers <br> FiR 3 35328313 109632 51125 Page 342 Text v 19 http //www biodiversitylibrary org/page/35328313 1863 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 19 1863 Geology Periodicals Smithsonian Libraries bhl page 35328313 dc identifier http //biodiversitylibrary org/page/35328313 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-20 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12645927923 2015-08-27 11 57 48 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1863 Photos uploaded from Flickr by FĂŚ using a script | ||||
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