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| Keywords: The Quarterly journal of the Geological Society of London (12960153845).jpg PKECARBONIFEROUS EOCKS OF CHAENWOOD FOREST <br> 343 <br> wavy and indefinite in outline bearing a general resemblance to a <br> ¢cryptocrystalline structure common in devitrified rhyolites On <br> rotating the stage other microliths appear in the dark parts ; and it <br> is doubtful whether any glass really remains Minute quartz grains <br> so far as they can be recognized are not numerous Most of those <br> present are from J to inch In outline they vary being some- <br> times rounded or subangular sometimes showing crystalline angles ; <br> they are often traversed by cracks ; occasionally they include a little <br> of the ground-mass and specks of viridite but usually are fairly <br> clear though here and there are a good many enclosures some being <br> opacite but many almost colourless like minute cavities fig 2 The <br> Pig 2 ” Portion of hrohen Quartz Crystal with Inclusions of Matrix <br> minute Cavities S -c High SJiarpley Enlarged <br> felspars are rather decomposed and stained with ferrite ; but ortho- <br> clase and a plagioclase probably oligoclase can be recognized Both <br> include numerous microliths of epidote viridite and perhaps another <br> Pig 3 ” Felspar Crystal with Inclusions resembling Brown <br> Glass 'C High Sharpley Enlarged <br> xather similar mineral together with a substance much resembling a <br> brown glass ; these often lie in the planes of cleavage fig 3 These <br> felspars are frequently in perfect crystals but sometimes appear <br> The general aspect of these felspars is remarkably like those in many <br> trachytes 36090704 111264 51125 Page 343 Text 36 http //www biodiversitylibrary org/page/36090704 1880 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 36 1880 Geology Periodicals Smithsonian Libraries bhl page 36090704 dc identifier http //biodiversitylibrary org/page/36090704 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-06 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12960153845 2015-08-26 15 51 03 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1880 Photos uploaded from Flickr by Fæ using a script | ||||
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