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| Keywords: The Quarterly journal of the Geological Society of London (13889246840).jpg ASSOCIATED ROCKS OF PORTHALLA COYE <br> 465 <br> Hock from Cou lo- <br> Eock near Fault merate to N of Cove <br> Water lost at 100° C 0-061 - o i pa <br> ž on ignition 1-80/ ' ' ' <br> Silica 74-90 72-95 <br> Alumina 10-20 11-50 <br> Oxides of iron 4 94 olo <br> Lime 1-12 1-62 <br> Magnesia 0-72 0-31 <br> Soda with a trace of potash 5-07 5'41 <br> Loss 119 1-46 <br> 100-00 100-00 <br> Sp gravity 2-681 2-69 <br> The high percentage of soda 5 per cent in these rocks is some- <br> what remarkable considering the very moderate proportions of <br> alumina and lime Nevertheless the felspar constituent which <br> is hy much the more abundant appears to be of the same kind that <br> characterizes the hornblende schist of Porthalla The rather high <br> specific gravity and the almost total absence of striping in the <br> microscopic sections of this rock when viewed by polarized light <br> tell the same tale <br> The Serpentine ” At a point about 60 or 70 yards to the east of <br> the first fault and succeeding the broken ground which marks the <br> position of the second or great fault fig 4 is the first appearance <br> Fig 4 ” Enlarged Plan of ' – 'Broken ground near Porthalla Cove <br> Scale -Q-Vd- <br> A Hornblende schist No 5 <br> B Serpentine No 4 <br> C Eed and green shales and mudstones No 3 <br> D Micaceous or talcose schists No 2 <br> E Porthalla slates No 1 36941284 113697 51125 Page 465 Text 40 http //www biodiversitylibrary org/page/36941284 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 36941284 dc identifier http //biodiversitylibrary org/page/36941284 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 N02/13889246840 2015-08-26 05 57 21 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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