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| Keywords: The Quarterly journal of the Geological Society of London (12683399704).jpg 1855 <br> MURCHISON LESMAHAGO SILURIANS <br> 17 <br> be connected upon the surface with <br> those of the tracts around the Lead <br> Hills and other parts of Ayrshire <br> and Dumfriesshire on the S and <br> S E must be a work of future la- <br> bour That work will demonstrate <br> whether these Lesmahago rocks <br> constitute an advanced Silurian <br> promontory or headland or whe- <br> ther as is most probable they form <br> an outlier of that age <br> The large parish of Lesmahago <br> is pre-eminently distinguished in its <br> western part by dome-shaped hills <br> which rise to the S W of the River <br> Clyde and on the left bank of that <br> river where it forms the well-known <br> beautiful Falls of Bonnington and <br> Stonebyres near the town of La- <br> nark The rock over which the <br> Clyde cascades is the Old Red <br> Sandstone which formation ex- <br> tending to the W and S W to the <br> village and parish of Lesmahago is <br> overlaid on the north and south by <br> carboniferous limestones and coal ; <br> whilst on the south-west it is un- <br> derlaid by the dark and schistose <br> rocks to which attention is now <br> specially invited <br> Upper Silurian Rocks ” The re- <br> lations of these dark grey schistose <br> strata of clay- slate to the Old Red <br> Sandstone are seen on the banks of <br> the Nethan River and also on those <br> of other tributaries of the Clyde <br> particularly the Logan Water on <br> each of which rivers Mr Slimon <br> has marked the junction between <br> the grey Silurian and the Old Red <br> rocks The Silurian beds rise up <br> into several hills of considerable <br> altitude one of which Nutberry <br> 1715 feet above the sea we as- <br> cended Judging from the outline <br> of the country and the exten- <br> sive range of similar high moor- <br> lands I am disposed to think that <br> these rocks may be found to spread <br> north and westward over the hills <br> VOL XII PART I <br> m o 35338442 109655 51125 Page 17 Text v 12 http //www biodiversitylibrary org/page/35338442 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 35338442 dc identifier http //biodiversitylibrary org/page/35338442 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 N02/12683399704 2015-08-27 11 50 31 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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