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| Keywords: The Quarterly journal of the Geological Society of London (13889818218).jpg or THE EIO-TINTO MINES <br> 261 <br> exist in the quartz-syenite ; and some of these could certainly be <br> worked to advantage by Cornish methods if the country were more <br> fully opened up by roads and railways but I reserve for the present <br> all further reference to them <br> Fig 9 ” Slate ivith Kernels of Cohaltiferous Oxide of Manganese <br> near Bella Vista <br> 4 Conclusion <br> A consideration of the facts here brought forward leads to the <br> following conclusions ” <br> 1 As to the Stratigrajphy of the District ” <br> a The slates are of late Devonian age but they include in some <br> places portions of still older clastic rocks which have not yet been <br> recognized in the neighbourhood in situ <br> h The slates in parts like the well-known Kupferschiefer ' of <br> Mansfeld were originally highly pyritous and cupriferous; but <br> being interstratified with ordinary Posidonomya-sohists they are <br> plainly much older <br> c After the slates had been deposited and upheaved they were <br> cut through by great masses of syenite As this syenite ranges <br> pretty nearly with the present strike of the slate it is probable that <br> this latter had been folded into its chief synclines and anticlines <br> before the intrusion of the syenite The slaty cleavage too which <br> now corresponds generally but not invariably with the bedding was <br> also produced previous to this intrusion but may have been since <br> increased <br> d Eoth slates and syenite have been penetrated by veins and <br> masses of diabase In the slates the diabase often follows the <br> stratification for considerable distances and then cuts across at a <br> very oblique angle the mean direction being E to W In the syenite <br> no such prevalent direction of the diabase veins is observable <br> e The porphyries are distinctly intrusive in the slates and not <br> actually interstratified with them although they often appear to be <br> so A kind of selective metamorphism has indeed converted some <br> Q J G S No 163 u 37047117 114009 51125 Page 261 Text 41 http //www biodiversitylibrary org/page/37047117 1885 Geological Society of London NameFound Cohaltiferous Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 41 1885 Geology Periodicals Smithsonian Libraries bhl page 37047117 dc identifier http //biodiversitylibrary org/page/37047117 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-30 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13889818218 2015-08-26 04 53 27 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1885 Photos uploaded from Flickr by Fæ using a script | ||||
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