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| Keywords: The Quarterly journal of the Geological Society of London (13205846445).jpg 268 <br> PROCEEDINGS OF THE GEOLOGICAL SOCIETY April 14 <br> Organic Structure and Mineral Composition of the Coal <br> The coal of Eastern Virginia although derived from a different <br> vegetation from that of the ancient carhoniferous period resembles <br> very closely the older coal in structure appearance and composition <br> That of the Blackheath mine has usually a highly resinous lustre and <br> conchoidal fracture and always contains at least as large a proportion <br> of gaseous or volatile ingredients hydrogen oxygen and nitrogen as <br> the coal of the palaeozoic rocks of the United States <br> The coal is also divided into horizontal layers of slight thickness <br> parallel to the planes of stratification as in the older kind of coal <br> Sometimes these layers consist alternately of highly crystalline and <br> resinous coal with a bright lustre and of other portions exactly re- <br> sembling charcoal in appearance The same is observed in some of <br> our Welsh coal where the charcoal is called mother coal <br> My friend Dr Hooker has had the kindness to examine for me <br> some specimens of this Virginian charcoal which I procured at the <br> Blackheath mines and others from those of Clover-hill before alluded <br> to and he finds vegetable structure in both but appearing in each <br> locality to belong to a different species of plant At first he thought <br> they might be referable to ferns but abandoned that opinion from <br> the total absence of cellular and scalariform tissues The prominent <br> glands of the fibres are much more minute than the glands of coni- <br> ferous tissue whilst the large perforated tubes are foreign to that <br> order They depart still more widely from Zamia and do not indeed <br> present any obvious affinity with any existing natural order Both <br> are very opake much crushed and so fragile that it is difficult to <br> obtain fragments fit for microscopic investigation They principally <br> consist of a mass of parallel fibres or elongated cells amongst which <br> occur very large tubes whose walls are pierced with circular or lon- <br> gitudinally or transversely elongated holes either scattered or placed <br> very close together <br> Vegetable Structure of Mineral Charcoal from Clover-hill Mines <br> Fig 3 36933007 113687 51125 Page 268 Text v 3 http //www biodiversitylibrary org/page/36933007 1847 Geological Society of London NameFound Zamia NameConfirmed Zamia L 1763 EOLID 11421944 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 3 1847 Geology Periodicals Smithsonian Libraries bhl page 36933007 dc identifier http //biodiversitylibrary org/page/36933007 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-17 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13205846445 2015-08-26 12 54 34 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1847 Photos uploaded from Flickr by Fæ using a script | ||||
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