MAKE A MEME
View Large Image
| View Original: | The_Quarterly_journal_of_the_Geological_Society_of_London_(12734009613).jpg (1945x3200) | |||
| Download: | Original | Medium | Small | Thumb |
| Courtesy of: | commons.wikimedia.org | More Like This | ||
| Keywords: The Quarterly journal of the Geological Society of London (12734009613).jpg 334 T E JAMIESON ON THE LAST STAGE OF <br> of snow would be melted before the ice in the central trough of the <br> valley broke up so that heavy floods of turbid water would be let loose <br> over the surface of the frozen rivers and thus rise to great heights <br> along their banks The thick solid ice occupying the bed of the <br> stream would take longer to melt but would gradually break up <br> rising to the surface in great masses and bringing with it stones and <br> pebbles from the bottom These masses of ice would float down the <br> stream dropping the boulders here and there as they dissolved <br> When the Straits of Dover were dry land and the rivers wandered <br> away down far below the present coast-line it is probable that during <br> the winter season the Seine the Somme the Thames c would be <br> completely frozen along what are now the lower reaches of these <br> rivers and at the break up of the snow in summer these frozen <br> masses would cause the river-floods to rise to heights which now <br> appear very marvellous <br> Mr Prestwich has discussed this subject in an excellent manner <br> in the « Philosophical Transactions ' for 1864 p 286 ; and I would <br> only suggest that he has perhaps not sufficiently allowed for the <br> unmelted ice in the bottom of the valley forcing the floods to reach <br> a height they could not otherwise do <br> The underground ice of Siberia may have been buried in this way <br> by the rivers flooding it and flinging down beds of mud on it before <br> it had time to melt and become detached from the bottom <br> § 8 Comparative Olaciation of East and West Coasts <br> I have often been struck with the remarkable intensity of the <br> glacial action displayed on the rocks of the west side of Scotland <br> compared with the east and in a former paper I threw out the <br> suggestion that the precipitation of snow along the west Highlands <br> had probably much exceeded what fell on the eastern slope of the <br> island just as takes place now in regard to the rainfall Thanks to <br> the Meteorological Society of Scotland we have now accurate data <br> concerning the rain ; and Mr Buchan's excellent papers on the <br> subject show us what an immense excess there is in the quantity <br> that falls on the west side of the country compared with the east <br> There are several stations in the west Highlands where the annual <br> rainfall exceeds 100 inches whereas along the east coast it ranges <br> generally from 25 to 30 ; and it is interesting to note that the gla- <br> ciation of the rocks corresponds in intensity with the present excess <br> of the rainfall showing that the precipitation of snow had been <br> similarly distributed ; and is it not the case generally that the marks <br> of ancient glaciers are most decided where the rainfall is now <br> heaviest <br> The prevailing wind in Scotland is the south-west which sweeping <br> up the moisture from the Atlantic is cooled as it rises over the <br> mountain-tops of the west coast and throws down its burden in <br> copious showers on those hills so that before it reaches the eastern <br> side of the island it is a comparatively dry wind Tbis is well seen <br> Quart Journ Geol Soc xix p 258 1863 35766239 110599 51125 Page 333 Text v 30 http //www biodiversitylibrary org/page/35766239 1874 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 30 1874 Geology Periodicals Smithsonian Libraries bhl page 35766239 dc identifier http //biodiversitylibrary org/page/35766239 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-24 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12734009613 2015-08-26 19 59 10 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1874 Photos uploaded from Flickr by Fæ using a script | ||||
.jpg){kind=link}
