MAKE A MEME
View Large Image
| View Original: | The_Quarterly_journal_of_the_Geological_Society_of_London_(12734076603).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 (12734076603).jpg J F CAMPBELL ON POLAK GLACIATION ETC 463 <br> 23 Daghestan the mountain-country is on the north side at <br> the Caspian end of the Caucasus The rocks are chiefly the folded <br> limestones which we crossed in the pass of Dariel afterwards and <br> apparently some of the dark shales on which they rest unconform- <br> ably The limestones are very like beds which appear in the right <br> bank of the Volga The long folds are parallel to the main range <br> One bed of dark earthy shale contains large globular concre- <br> tions We come to it repeatedly in Daghestan in deep water- <br> courses Another bed consists of large hard rolled pebhles in a <br> matrix <br> From the nature of the country the clearness of the air and the <br> absence of vegetation the structure of Daghestan is easily seen <br> The edges of the flags and schists and igneous rocks which we after- <br> wards passed near Kasbeg seem to form the crests of the whole <br> range and furnish the boulders and pebbles which the largest rivers <br> roll down to the plains <br> 24 West-end From Tiflis to Poti on the south side of the <br> range and along the shores of the Black Sea the structure seen <br> near Tiflis appears to extend into the Crimea along the northern <br> shores of the Black Sea <br> The lower hills are made of folded beds of newer stratified rocks <br> the higher hills of the edges of harder beds upheaved I will not <br> attempt to guess at the age of the rocks ; but some appeared like <br> Mountain-Limestones the Coal-measures and superincumbent strata <br> Coal has been found in the Caucasus and is worked north of the Sea <br> of Azov and south of the Black Sea <br> In any case a great thickness of old sedimentary beds have been <br> tilted up on edge and a great thickness of newer beds have been <br> crumpled and folded like dough ; and the key to Southern-Bussian <br> geology is in the Caucasus in the Gate of Asia in the pass of <br> Dariel The general disturbance may be found to coincide with the <br> geological disturbance which upheaved the Alps and other chains <br> Between lat 30° and 40° N there is a marvellous coincidence in the <br> general direction of mountain-ranges in Europe and Asia <br> 25 Denudation Such is a rude outline of the geology which I <br> thought I saw while rapidly travelling through the Caucasus The <br> shapes of the hills and hollows which I studied and drew clearly <br> are due to aqueous denudation see fig 4 <br> If ever glaciers worked in the range their traces have been <br> almost entirely obliterated Very little rain now falls in Daghestan <br> or anywhere on the northern slopes The rivers which drain the <br> range are small Houses have flat roofs ; dresses are not contrived <br> In the map Daghestan which was conquered about eight years ago is not <br> coloured <br> Koch's Geological Map 1850 does not colour Daghestan The Dariel Pass <br> from north to south is coloured Tertiares Secondares Gestein and Thon- <br> Schiefer Kasbeg and the opposite mountain are coloured Volcanic including <br> therein Basalt and Trachyte <br> I have also read Mr Freshfield's book and his paper published by the Geo- <br> graphical Society to which I refer below 35766384 110599 51125 Page 462 Text v 30 http //www biodiversitylibrary org/page/35766384 1874 Geological Society of London NameFound Poti NameConfirmed Poti EOLID 4257004 NameBankID 4576268 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 30 1874 Geology Periodicals Smithsonian Libraries bhl page 35766384 dc identifier http //biodiversitylibrary org/page/35766384 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 N02/12734076603 2015-08-26 20 02 19 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}
