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| Keywords: The Quarterly journal of the Geological Society of London (12683206275).jpg 1856 <br> HARKNESS ” PERMIAN ROCKS OF SCOTLAND <br> 261 <br> In the course of the Glasgow and South-western Railway we <br> have the sandstones exposed twice in the cutting between the Thorn- <br> hill and Carron Bridge Stations and one of these exposures presents <br> a troughing of the beds North of Carron Bridge Station in the <br> cutting at the south entrance of the Drumlanrig tunnel we have the <br> sandstones and accompanying strata well exposed The beds here <br> dip south at an angle of about 1 2° ; and besides sandstones we have <br> breccias of an interesting character The south end of the tunnel <br> consists of amygdaloidal trap ; and on the south side of this we have <br> the breccias composed of fragments of the igneous rocks in great <br> abundance ; and these with the associated sandstones dip from the <br> amygdaloids See Section fig 3 At the north end of the tunnel <br> Fig 3 ” Section at the South Entrance of Drumlanrig Tunnel <br> Carron Bridge Station Dumfriesshire <br> b Sandstones and Breccias <br> a Trap-rock <br> we have variegated Carboniferous grits dipping S S E at an angle <br> of 25° ; and through these grits the igneous rock has burst <br> The occurrence of igneous rocks here and the relations which <br> these bear to the Carboniferous beds as well as their connexion <br> with the newer sandstone strata are subjects of interest as we are <br> enabled to some extent to derive information concerning the age of <br> the latter ; and this is more important as we shall find in another <br> district the sandstones and breccias occurring under like circumstances <br> The relations which exist between these several rocks show that the <br> outbursts of trap were anterior to the deposition of the sandstones and <br> breccias ; and this does not appear to be a mere local occurrence but <br> tends to support the inference that the Coal-fields of the centre of <br> Scotland had not only been deposited but had been subjected to all <br> those violent disturbances and outbursts of igneous matter which <br> are so prevalent among them before the deposition of the sandstones <br> and breccias <br> As in the other areas of sandstone which are found in Drumfries- <br> shire we have no proofs that the causes which disturbed them have <br> affected the Silurians surrounding this area ; but the intermediate <br> Carboniferous strata partake to a great extent of the influences of <br> the forces which have disturbed the newer formation From the <br> appearance of the breccias in the lower portion of these deposits I <br> am disposed to consider them as the equivalents of the lower and <br> middle portion of the Corncockle series 35338714 109655 51125 Page 261 Text v 12 http //www biodiversitylibrary org/page/35338714 1856 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 12 1856 Geology Periodicals Smithsonian Libraries bhl page 35338714 dc identifier http //biodiversitylibrary org/page/35338714 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-21 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12683206275 2015-08-27 11 55 11 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1856 Photos uploaded from Flickr by Fæ using a script | ||||
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