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| Keywords: The Quarterly journal of the Geological Society of London (13960289003).jpg 262 <br> inss C A RAISES ON S01EE <br> One of the stronger layers proves on microscopic examination to be <br> honeycombed with irregular vesicles like a piece of trachyte The <br> firmness of the band is due to the hollows being filled up with <br> quartz and the rock-mass silicified This layer may represent the <br> <br> I 5 <br> I <br> ¢I <br> ” <br> o <br> fcD <br> a <br> £ s <br> « <br> g r d <br> IS <br> m <br> g go <br> _ B - <br> O C <br> b Ha <br> S <br> t£ - ft <br> B o 3 <br> ¢5 G 72 <br> -'3 » <br> J'S'S <br> l <br> r - <br> § « <br> cQ g <br> Oft <br> g 5 oS <br> ft C ~ <br> 03 3 <br> outer more vesicular part of the original lava-flow; the deeper <br> mass cooling and contracting gave rise to perlitic structures and <br> the vapours contained may have been emitted and collected in <br> larger vesicles which occur at the heart of agate-nodules 36940055 113696 51125 Page 260 Text 45 http //www biodiversitylibrary org/page/36940055 1889 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 45 1889 Geology Periodicals Smithsonian Libraries bhl page 36940055 dc identifier http //biodiversitylibrary org/page/36940055 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-21 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13960289003 2015-08-26 05 51 51 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1889 Photos uploaded from Flickr by Fæ using a script | ||||
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