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| Keywords: The Quarterly journal of the Geological Society of London (12960217735).jpg 600 <br> J E MAEE ON TEE PEEDEVONIAN <br> intrusive eclogite The eclogite itself near Chlumicek is of a dark <br> olive-green colour Near the small village of Krems south of <br> Chlumicek not the Krems above mentioned it is of a reddish hue ; <br> south of Slavis to the east of Chlumicek it is of an amher-hrovs n ; <br> whilst near Holobau it is black In each locality it is very hard <br> The last-mentioned place yields a very interesting section fig 4 in <br> which the eclogite is clearly seen to be intrusive The section is to <br> the north of the road just before it crosses a stream to the east of <br> the village of Holobau <br> Fig 4 � Section by Bridge east of Holohan Height about 10 feet <br> G White quartzose foliated rock with amber-coloured garnets <br> E Hard black eclogite X X Joint and fault <br> Wear Srnin between this place and Krumau occurs another mass <br> of eclogite probably connected with the former at no great distance <br> below the surface and altogether similar to it It is of a brown <br> colour <br> § 4 COMPAEISON OE THE StRATA WITH ENGLISH DEPOSITS <br> In Salter's Catalogue of Cambrian and Silurian fossils of the Uni- <br> versity of Cambridge some of the Bohemian beds are correlated <br> with English deposits A more detailed correlation is given by <br> Dr Hicks Geol Mag dec ii vol iii table opposite p 156; <br> cf also Hicks Q J G S vol xxxi p 552 Professor Krejci also <br> in his work on the Geology of Bohemia pp 461 et seqq gives a com- <br> parison of the Cambrian and Silurian rocks of the two countries <br> Sir R I Murchison Siluria p 375 on the other hand says Eor <br> my own part however I have always thought that geologists should <br> Professor Bonney has kindly examined a slide of this rock from Chlumicek <br> and given me the following note � <br> Your rock from Chlumicek has no claim whatever to be called a <br> serpentine The chief mineral is omphacite with perhaps as is commonly <br> the case some smaragdite The other prevailing mineral is a decomposition <br> product after garnet It has a peculiar fibrous structure and acts upon <br> polarized light the fibres radiating irregularly from a centre outwards 1 have <br> seen something like it in an alteration product of Oordierite That it is <br> after garnet is shown not only by its mode of occurrence but also by one or <br> two bits of unaltered garnet remaining in the centre There are a few brown <br> microliths in part probably only stains The rock therefore is an eclogite with <br> most of the garnets replaced by a decomposition product The great difierence <br> in the condition of the two principal minerals is rather curious though not <br> without parallel in the felspar and augite of some dolerites � T G B 36090995 111264 51125 Page 600 Text 36 http //www biodiversitylibrary org/page/36090995 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 36090995 dc identifier http //biodiversitylibrary org/page/36090995 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 N02/12960217735 2015-08-26 15 55 14 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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