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| Keywords: The Quarterly journal of the Geological Society of London (13364989835).jpg 124 PROCEEDINGS OF THE GEOLOGICAL SOCIETY NoV <br> No ft in <br> 3 Laminated sandstone 5 4 <br> 2 Laminated arenaceous shale 3 <br> L Laminated sandstone 11 <br> The highest bed of the millstone grit a flaggy sandstone <br> Total thickness of coal-measures 1860 <br> Analysis of the preceding Section <br> ft in <br> Arenaceous and argillaceous shales 1127 3 <br> Underclays 99 6 <br> Sandstones 562 <br> Coal 37 <br> Bituminous shales 26 5 <br> Carbonaceous shales 3 3 <br> Limestones 3 11 <br> Conglomerate 8 <br> 1860 <br> Prom this analysis it appears tliat the argillaceous and arenaceous <br> shales occupy about two-thirds of the whole section ; they are gene- <br> rally of a grey or bluish grey colour but occasionally red purple or <br> brown as specified in the section Their composition is variable <br> passing from soft unctuous clays through every conceivable grade <br> into arenaceous beds so highly charged with siliceous matter as to <br> be with difficulty distinguished from fine-grained sandstones They <br> are generally laminated but there are many beds some of great thick- <br> ness which present no traces of lamination ; these disintegrate rapidly <br> when exposed to the air and might more properly perhaps be desig- <br> nated marls Viewed at some distance from the water the parallel- <br> ism and persistence of the shale beds appear to be perfect ; it is only <br> by a close examination that we occasionally discover a bed of shale <br> replaced by sandstone as in the annexed cut where the bed of red <br> Fig 1 <br> Sandstone Shale 215 <br> High- <br> water \ <br> line J <br> Shale 213 <br> Shale 214 <br> shale No 214 terminates at the height of eight feet above high- water <br> line and is replaced by hard laminated sandstone which overlaps the <br> edge of the shale The underside of the sandstone in contact with the <br> subjacent shale No 213 presents markings of fucoids which cannot <br> be observed upon the underside of the red shale showing that in the <br> interval between the deposition of the red shale and the sandstone <br> unconformably upon its edges a layer of sea-weeds had been spread <br> over the uncovered portion of the surface of the shale No 213 <br> The red shales are very irregular in thickness ; thin beds of twelve <br> or fifteen inches sometimes increase to three or four feet in depth 36933949 113689 51125 Page 124 Text v 6 http //www biodiversitylibrary org/page/36933949 1850 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 6 1850 Geology Periodicals Smithsonian Libraries bhl page 36933949 dc identifier http //biodiversitylibrary org/page/36933949 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-23 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13364989835 2015-08-26 11 55 08 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1850 Photos uploaded from Flickr by Fæ using a script | ||||
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