MAKE A MEME
View Large Image
| View Original: | The_Quarterly_journal_of_the_Geological_Society_of_London_(12734123834).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 (12734123834).jpg 92 A C RAMSAY ON THE PHYSICAL HISTORY <br> river just as the streams that issue from the smaller glaciers of <br> to-day attack the terminal moraines and restrict their growth <br> A necessary consequence of the powerful flow of such a large <br> body of glacier- water must have been to carry the waterworn stones <br> onward to Basel and into the flats beyond; and in time as the river <br> changed its channel and wandered hither and thither across the <br> plain the gravels got scattered over the whole of its area The <br> thick strata of sand loam and gravel that form the present plain of <br> the Rhine are therefore in great part the waterworn debris of old <br> moraines just as the gravels of the plains of Piedmont and Lom- <br> bardy are relics of the moraines of the gigantic glaciers of the <br> Italian side of the Alps This view of the origin of the gravels of <br> the Rhine was pointed out to me thirteen years ago by Professor <br> Desor of Neuchatel though I do not recollect that he has printed <br> any thing on the subject <br> The substance of the foregoing remarks may be summed up as <br> follows � <br> 1 During portions of the Miocene epoch the drainage through <br> part of the valley that lies between the Schwarzwald and the Vosges <br> was in great part from north to south or in other words from the <br> hills north of Mainz into the area now occupied by the Miocene rocks <br> of Switzerland <br> 2 After those physical disturbances and elevations that closed <br> the so-called Miocene epoch in these regions the direction of the <br> drainage was reversed and thus it happened that � <br> 3 After passing through the hill-country between the lake of <br> Constance and the place where Basel now stands the Rhine flowed <br> along an elevated plain formed of Miocene rocks the relics of which <br> still exist between Basel and Mainz <br> 4 At the same time the Rhine flowed in a minor valley through <br> the upland country formed of the Devonian rocks that now con- <br> stitute the Taunus the Hundsruck and the contiguous high land <br> lying northerly towards Bonn <br> 5 Then by the ordinary erosive action of the great river the gorge <br> was gradually formed and deepened to its present level and � <br> 6 Just in proportion as the gorge deepened so the gently inclined <br> Miocene strata of the area between Mainz and Basel were also in <br> great part worn away so as to leave the existing plain which to <br> the uninstructed eye presents the deceptive appearance of once <br> having been occupied by a great lake <br> Since this memoir was sent to the Geological Society I have read a learned <br> paper sent to me by Professor Fridolin Sandberger On the Upper Ehine <br> Valley in Tertiary and Diluvial Times Das Ausland No 50 Dec 15 1873 <br> This memoir which is of the highest value contains a great amount of infor- <br> mation on the relations stratigraphical and palfeontological of all the formations <br> found in the valley of the Ehine from the Upper Bunter Sandstone down to <br> the times of the Loess and superficial gravels <br> Professor Sandberger only here and there incidentally touches upon the physi- <br> cal questions to which I confine myself and apparently had no intention of <br> going into the details by means of which I attempt to prove what I conceive to be <br> the physical history of the valley especially in its later stages Wherever he <br> does touch on these subjects however there is no discrepancy in our views On 35765949 110599 51125 Page 91 Text v 30 http //www biodiversitylibrary org/page/35765949 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 35765949 dc identifier http //biodiversitylibrary org/page/35765949 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 N02/12734123834 2015-08-26 19 50 50 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}
