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| Keywords: The Quarterly journal of the Geological Society of London (13889136129).jpg OF THE SOUTH DEVON COAST 15 <br> Two specimens from different parts of the Start headland call <br> for no special remark Three specimens one from the schist to the <br> west of Prawle village the others from the two principal masses <br> further west selected to see if they were microscopically as well as <br> macroscopically identical agree in all essential particulars with one <br> another and with the la st two ; so also do three from the Bolt Head <br> one from a quarry just inside the grounds another from the eastern <br> face of the Head and a third from near the Mewstone except that in <br> these perhaps there may be a little more of the black mineral <br> There is therefore nothing to be discovered under the microscope <br> which forbids us to consider all the thick masses of mica-schist one <br> and the same rock I figure a portion of one from the Bolt Head <br> Fig 7 ” Section oC Mica-sclmt fomthe Bolt Head x 50 <br> fig 7 to give an idea of the general structure and the extraordinary <br> corrugations I examined slices from the bands A and A of fig 2 <br> which are undoubtedly below the main mass of the chloritic schist in <br> the hope of finding something that would characterize a lower mica- <br> schist but without success They contain a few grains of a mineral <br> which also occurs in the chloritic schist and rarely in the ordinary mica- <br> schist; as I shall presently explain this may be a felspar but I have <br> doubts as to its nature I have also examined one of the lower <br> schists from the northern side of South Sands but it does not help <br> in our attempts at differentiation Hence as might be expected <br> the microscopic evidence as to the position of the mica-schist is in- <br> conclusive <br> The macroscopic aspect of the chloritic schist has already been <br> described p 6 Seven specimens have been cut for microscopic <br> examination In these three minerals predominate ” 1 the most 36940734 113697 51125 Page 15 Text 40 http //www biodiversitylibrary org/page/36940734 1884 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 40 1884 Geology Periodicals Smithsonian Libraries bhl page 36940734 dc identifier http //biodiversitylibrary org/page/36940734 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-30 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13889136129 2015-08-26 05 56 30 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1884 Photos uploaded from Flickr by Fæ using a script | ||||
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