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| Keywords: The Quarterly journal of the Geological Society of London (12471124015).jpg 1865 <br> WALLACE FLOS FERRI <br> 415 <br> semitransparent and beautiful the occurrence of the branched arra- <br> gonite is very rare I have not heard of more than four or five caverns <br> in which it has been found except in small pieces In the Nent- <br> head mines stalactites are never found except near the surface or <br> in the old works <br> Two of these caverns have come under my notice One of them <br> in a north vein of the Silver Band Mine where the Great Limestone <br> forms its walls The vein is not strong On the north side of a <br> short portion the limestone was flatted for a few feet from the vein <br> The flats contained lead-ore and other minerals all of them much <br> decomposed Nearly all the sulphide of lead was changed into car- <br> bonate and the round lumps of carbonate mingled with the oxides <br> of iron had not unfrequently crumbled into small particles having <br> the appearance of fine sand of a light-brown colour Only a few <br> fathoms west from where the arragonite was found the vein and fiat <br> are filled chiefly with impure barytes not much affected by the de- <br> composing agents The cross section fig 1 wiU enable me to de- <br> scribe more clearly the phenomena connected with the cavern <br> Fig 1 Section of a Cavern in the Silver Band Mine <br> 1 I 3 Great Limestone <br> That part of the cavern marked a Avas filled wdth rubbish and <br> pieces of sandstone ; without doubt the latter had fallen through the <br> The transparent stalactites exhibit double refraction <br> 2 F 2 34892089 108495 51125 Page 415 Text v 21 http //www biodiversitylibrary org/page/34892089 1865 Geological Society of London NameFound Flos NameConfirmed Flos EOLID 32842 NameBankID 3001797 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 21 1865 Geology Periodicals Smithsonian Libraries bhl page 34892089 dc identifier http //biodiversitylibrary org/page/34892089 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-12 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12471124015 2015-08-27 10 02 34 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1865 Photos uploaded from Flickr by FĂŚ using a script | ||||
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