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| Keywords: The Quarterly journal of the Geological Society of London (13369164983).jpg 452 <br> PROCEEDINGS OF THE GEOLOGICAL SOCIETY May 28 <br> the gorge at a which used to flow regu- <br> larly clown the fan from a to d may <br> indeed for a time flow nearer the moun- <br> tains down another of the radial water- <br> courses to a part of the fan- edge where <br> the river has not eaten its way in; but <br> it is sure some time or other to find its <br> way over a part of the fan that leads to <br> the cliff ; Yover this then it will fall ; and <br> it will soon cut a channel for itself in the <br> cliff-edge and continue to cut back that <br> channel so as to modify the shape of its <br> bed as far back as a or even further into <br> the ravine itself This action however <br> may be interrupted by some cause origin- <br> ating at or near the mouth of the ravine <br> which shall deflect the river-course and <br> lead it either as before down an unbroken <br> part of the fan or to another portion of <br> the cliff in which last case a similar action <br> would be set up there Thus we often see <br> gullies cut in the cliff-edge where the <br> stream had for a time flowed but from <br> which it had been stopped above before <br> any very deep channel was made Ulti- <br> mately however the stream is sure to <br> deepen one course for itself so much and <br> so far back that all further wanderings <br> are prevented and for the future it will <br> flow out along a deep gully between cliffs <br> of the fan-alluvium <br> Yet another effect is produced over <br> this newly cut gully while it is forming <br> will come with the water the usual de- <br> tritus ; and that will with the addition of <br> the waste of the fan itself involved in the <br> cutting of the gully fall and settle at the <br> foot of the cliff in a more or less modified <br> talus ; as this rises and the gully deepens <br> the talus and the new stream-bed will <br> meet and the stream will then flow out <br> over the talus and eventually by still <br> adding material lessen the angle of the <br> talus-slope and make a new fan with <br> nearly the same inclination as the old one <br> had projecting in front of the fan-cliff <br> In the diagrammatic section fig 8 the <br> lower unbroken line from a to b denotes <br> the position of the new stream-bed in <br> the gully while the continuation of it 39051390 120601 51125 Page 452 Text v 29 http //www biodiversitylibrary org/page/39051390 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 39051390 dc identifier http //biodiversitylibrary org/page/39051390 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 N02/13369164983 2015-08-26 10 56 00 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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