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| Keywords: The Quarterly journal of the Geological Society of London (12644983705).jpg 1848 <br> SHARPE ON SLATY CLEAVAGE <br> 119 <br> organic remains The lines y y show the direction of the cleavage- <br> planes The plane of bedding a a has been broken into a very irre- <br> gular series of steps by some force which has either moved each <br> sheet of slate forward in ad- <br> vance of its neighbour or has <br> caused an uneven expansion <br> of the parts of the rock The <br> fossils have suffered from this <br> movement of the surface <br> The whole bed is covered by <br> small irregular ridges parallel <br> to the cleavage which make <br> it impossible to measure the <br> angles accurately <br> In figure 7 « « represents <br> the section of the surface of <br> a bed of black calcareous <br> slate in the Bickington lime- <br> stone quarry North Devon <br> which is bent over in a steep <br> arch and dips rapidly to the <br> north ; it is intersected by <br> cleavage y y dipping nearly <br> 70° to the south In this <br> instance the surface of the <br> bed « a is bent into parallel <br> waves without its continuity <br> being broken but the out- <br> lines of the beds below h h <br> and c c may be traced in the <br> solid rock unchanged; so that <br> the disturbance of the surface seems only to have taken place where <br> the looser packing of the rocks allowed room for some play of their <br> parts <br> Figure 8 represents another case of the same kind observed in the <br> Brathay flag-stone quarry near Ambleside ; a a being the surfr ee of <br> a bed and yy the planes of cleavage <br> In cases like the last two the whole surface of the beds a a is <br> covered with irregular flutings running in the direction of the strike 35268761 109512 51125 Page 119 Text v 5 http //www biodiversitylibrary org/page/35268761 1849 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 5 1849 Geology Periodicals Smithsonian Libraries bhl page 35268761 dc identifier http //biodiversitylibrary org/page/35268761 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 N02/12644983705 2015-08-27 10 57 06 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1849 Photos uploaded from Flickr by Fæ using a script | ||||
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