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| Keywords: The Quarterly journal of the Geological Society of London (12645690054).jpg s <br> of two curious fossils from the roof of the main coal calculated in my <br> opinion to afford some interesting information concerning the habit <br> and mode of growth of Sigillaria alternans ; and at the same time <br> to clear up all doubts respecting the true nature of the dome-shaped <br> fossil figured and described in Lindley and Button's ' Fossil Flora ' <br> vol ii pref p xiii <br> Fig 1 <br> c <br> stump of Sigillaria alternans one-twelfth of the natural size <br> Fig 1 is a sketch of an upright stump sixteen inches in height <br> and twelve inches in diameter at the top which dropped from the <br> roof of the seam some time after the coal had been removed ; the <br> greater part of the branching roots had fallen do vn and been stowed <br> aw ay amongst the rubbish of the mine before the stem was discovered ; <br> the few that remained are in external appearance true Stigmarise but <br> being filled up with soft shale no traces of internal organization can <br> be observed except occasionally a flattened central core The upper <br> part of the stem was covered with a coaly bark one-fifth of an inch <br> in thickness which was closely marked with irregular short striae in <br> a vertical direction and by long projecting wrinkles running spirally <br> round the stem as shown at c fig 1 A thin layer of hard shale <br> which envelopes the bark completely conceals the leaf- scars Lower <br> down the bark was thinner and very smooth whilst that which <br> covered the roots a h was so exceedingly thin and friable that it <br> fell off on the slightest touch <br> The leaf-scars on the decorticated stem are very sharp and distinct ; <br> they begin close to the ramifications of the roots and run in single <br> spiral lines over a zone three or four inches in width ; above this zone 35269005 109512 51125 Page 355 Text v 5 http //www biodiversitylibrary org/page/35269005 1849 Geological Society of London NameFound Sigillaria alternans Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 5 1849 Geology Periodicals Smithsonian Libraries bhl page 35269005 dc identifier http //biodiversitylibrary org/page/35269005 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-20 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12645690054 2015-08-27 10 50 59 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1849 Photos uploaded from Flickr by Fæ using a script | ||||
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