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| Keywords: The Quarterly journal of the Geological Society of London (12645725615).jpg 188 <br> PKOCEEDLNTGS OF THE GEOLOGICAL SOCIETY <br> division -planes which dip at 60° to S 43° W These rocks generally <br> weather to a dark rusty brown probably from containing the prot- <br> oxide of iron Soon after the same rocks dip at 60° to N 27° W <br> again on the foliation of the slate but in a few yards fall to 35° N <br> 27° W from a curve in the beds The next acclivity is a fine- <br> grained mica-slate with a veined aspect from the folia being arranged <br> in curved layers The dip here is still low 30° to N 17° W but <br> soon rises to 65° N 12° W in a grey mica-slate full of quartz-veins <br> This rock continues to the summit of the hill where the dip is 55° <br> N 17° W and a nearly similar dip appears in the rugged precipice <br> along the ridge to the north Other division-planes dipping 70° S <br> 50° W are seen in these cliffs ; and a series of ridges and hollows <br> like the outcrop of beds run N 50° W across the top of the hill <br> The rock there is still a light-grey mica-slate with small garnets <br> rarely disseminated through it <br> s <br> Fig 5 ” Section of Ben Lecli <br> e <br> a Red Conglomerate <br> b Clay-slate <br> ; \ \c <br> c Mica-slate <br> d Greenstone <br> e Felspar-porphyry <br> On descending the mountain on the north-east towards the top of <br> the great corrie that opens up from Loch Lubnaig the mica-slate <br> passes into a coarse granular rock full of rounded grains of quartz <br> and almost like a greywacke but still distinctly foliated This is <br> again one of those transition-forms that so clearly illustrate the me- <br> tamorphic character of these rocks The dip of these beds is 45° to <br> N 18° E ; but other planes dip at 67° to S 38° W and thus ap- <br> proximately parallel to the second set of division-planes already men- <br> tioned It is however curious that these coarse-grained greywaeke- <br> like beds both here and in other places do not coincide in dip with <br> the slates or finer beds near them Still lower on the mountain <br> towards the south mica-slate again appears dipping 70° to N 40° E <br> Below it there is an irregular vein or mass of light-grey greenstone <br> decomposing in globular concretions and probably the continuation of <br> the vein near Ardchullarie on the other side of Loch Lubnaig Still <br> lower a veryquartzose mica-slate in thin beds dips at 70° to N 27°W <br> The stream continues to flow over irregular beds of mica-slate in some <br> places much bent and contorted and dipping E at 10° to 30° in other <br> places more regularly at 65° to N 10° W Near the foot of the <br> corrie the stream forms a series of picturesque linns over the ledges <br> of the fine-grained mica-slates which dip at 70°-80° to N 30°-40° W <br> At the foot of the hill the dip falls to 60° and further south to 35328149 109632 51125 Page 188 Text v 19 http //www biodiversitylibrary org/page/35328149 1863 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 19 1863 Geology Periodicals Smithsonian Libraries bhl page 35328149 dc identifier http //biodiversitylibrary org/page/35328149 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 N02/12645725615 2015-08-27 10 59 25 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1863 Photos uploaded from Flickr by Fæ using a script | ||||
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