Keywords: The Quarterly journal of the Geological Society of London (12645994553).jpg 10 <br> GEOLOGICAL MEMOIRS <br> rS <br> a <br> ft5 <br> ¢to <br> © <br> es <br> SS <br> o <br> BAOO «p <br> ojpaj -g <br> o <br> Si <br> u <br> -a <br> O <br> Q <br> to <br> a <br> 'a <br> '3 <br> <br> The following section shows the order of succession and the strati- <br> graphical relations of these several systems ” <br> This section has been <br> already given by Mr D <br> Sharpe in his paper On <br> the Geology of the Neigh- <br> bourhood of Oporto ; it <br> represents the relations <br> which apparently exist <br> between the foregoing <br> systems of rocks and the <br> coal-beds the latter ap- <br> pearing to dip beneath the <br> former <br> Even if the manner in <br> which the coal-beds here <br> crop out intimated their <br> true geological situation in <br> reference to the rocks of <br> the fourth system which <br> appear to cover them it <br> would still remain tobe ex- <br> plained why the mining- <br> works that have been car- <br> ried out in the neighbour- <br> hood of S Pedro da Cova <br> Covelo and Povoa have <br> always been in that zone <br> in which the valuable beds <br> are exposed and why the <br> attempt has never been <br> made further east in <br> which direction the coal <br> dips at an angle of about <br> 35° under the coal-shale <br> If it had been discovered <br> through the first work- <br> ings that the coal-beds <br> continued further beneath <br> and dipped under the Si- <br> lurian beds it would have <br> been attempted to win the <br> coal again by shafts sunk <br> to the east of the inter- <br> mediate zone As this <br> however has not taken <br> place there is every rea- <br> son for doubting this con- <br> £ a <br> _o3 CO <br> 5§ <br> O <br> » to <br> a <br> OS <br> CO <br> ti <br> OS <br> as <br> e3 <br> „¢ t <br> co V <br> O Pi <br> O <br> D 03 0 <br> o o <br> 13 3 1 <br> § <br> TJ oo <br> S3 m <br> o <br> -i zS J <br> tj o 2 <br> - <br> x <br> s <br> CO <br> I <br> - – d <br> CO <br> © <br> CO <br> 03 M3 <br> So- <br> » o3 -© <br> £ si C <br> ¢ – so 5 <br> 3 r « <br> <br> Quart Journ Greol <br> vol v 1849 p 145 <br> Soc 35328545 109632 51125 Page 10 Text v 19 http //www biodiversitylibrary org/page/35328545 1863 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 19 1863 Geology Periodicals Smithsonian Libraries bhl page 35328545 dc identifier http //biodiversitylibrary org/page/35328545 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-20 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12645994553 2015-08-27 11 59 50 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1863 Photos uploaded from Flickr by Fæ using a script |