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| Keywords: The Quarterly journal of the Geological Society of London (12960448604).jpg 104 PEOF T G bonnet's PETEOLOGICAL NOTES ON THE <br> kind of gneiss with a structure generally resembling the quartz- <br> schists described below but containing a little more felspar decom- <br> posed The difference however is simply varietal <br> Fig 6 ” Mica-scTiist from the wpper part of Glen Doeherty <br> Newer Series of Author <br> It is quite true that the mica-schists in the road dip at about 30° <br> a little W by S and that in the ravine about to S W The dip of <br> the gneissic rock a little above is nearer to the former ; but on the <br> opposite side of the glen the rocks appear to preserve the usual south- <br> easterly dip ; and these quartzose beds have a very shattered aspect ; <br> so that I have not the slightest doubt the change of strike is merely <br> local and due to the neighbouring fault as in the case already <br> described <br> Between this point and Auchnasheen little rock is exposed near the <br> road but nothing in the terrain suggests the introduction of any <br> group other than that from which Glen Docherty is excavated From <br> Auchnasheen I ascended Ben Fyn mounting by the right hand one of <br> two streams visible from the inn and returning in part by the <br> other A small quarry about 200 ft above the inn gives a good sec- <br> tion of a gneiss with red garnets The rock is flaggy in structure <br> well foliated parallel to its bedding dipping towards the E at about <br> 30° rather rolled having a general resemblance to the newer series <br> to the north-west but more highly altered Under the microscope the <br> rock is seen to consist of quartz clear with exception of some small <br> microliths and very minute cavities orthoclase felspar with some <br> plagioclase in good preservation long colourless belonites are present <br> in some of the crystals biotite and a little of the white mica already <br> described and opacite with two or three garnets The rock is more <br> highly altered than the rocks already described but stiU presents <br> some structural resemblance to them Above this for some 1200 ft <br> the rocks continue to be flaggy occasionally most conspicuously but <br> Some of the grains show a minute graphic or rather vermicular structure <br> Cf ' Nature ' xiv pp 8 68 36090439 111264 51125 Page 104 Text 36 http //www biodiversitylibrary org/page/36090439 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 36090439 dc identifier http //biodiversitylibrary org/page/36090439 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 N02/12960448604 2015-08-26 16 56 30 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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