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| Keywords: The Quarterly journal of the Geological Society of London (12646223504).jpg 206 PROCEEDINGS OF THE GEOLOGICAL SOCIETY <br> is again succeeded by fine-grained grey gneiss much contorted but <br> dipping south-east probably at a high angle Still higher beds of <br> quartzite appear dipping at 10° to S 47° E and thus though the <br> immediate junction is not seen apparently unconformable to the <br> gneiss In others of the surrounding hills the quartzite readily <br> recognized by its white colour also appeared to rest unconformably <br> on the grey gneiss but I was prevented from determining this point <br> by further examination <br> About ten miles from Fort William Glen Nevis is crossed by a <br> great ridge of rock through which the river forces its way in a series <br> of narrow gorges and rugged cascades This ridge must have been <br> cut through by the river in some very different condition of the <br> country as the valley beyond it lies at a much lower level than its <br> summit and opens out to the upper part of Glen Treig by what <br> would be its natural drainage Above this ridge a large branch of <br> the river enters from the south forming a fine waterfall over an <br> overhanging cliff In this place there is another interesting section <br> represented generally in fig 12 though from the incessant rain and <br> mist I was again prevented following out all its details <br> Fig 12 � Section of the upper part of Glen Nevis <br> n s <br> Red Granite Mica-slate <br> On the north-west is the granite dome of Ben Nevis pierced by <br> the porphyry prism that forms the summit of the mountain To this <br> succeeds a ridge of mica-slate dipping at 70° to N 47° W and <br> thus apparently below Ben Nevis Both in mineral character and <br> dip these beds correspond with the mica- slate seen in Glen Spean <br> above the opening of Glen Roy The valley forms an anticlinal as <br> the strata on the other side dip about 45° to the south and in the <br> higher part of the mountains appear to be again covered by the <br> quartzite <br> 22 Glen Spean � In Glen Spean on the north side of Ben Nevis <br> a similar series of rocks is seen but with some diversity in the <br> details In the lower part of this glen the mica- slate dips generally <br> to S 50° E and contains one or more beds of limestone which are <br> quarried in some places and is also intersected by veins of red <br> felspar-porphyry and granite Near the mouth of Glen Hoy the <br> dip changes and the mica-slate further up dips bb° or 60° to N <br> 50°-55° W These beds appear to correspond to the mica-slate <br> seen in the upper part of Glen Nevis Some of the lofty mountains <br> however on the south towards Loch Treig consist of gneiss which J 35328167 109632 51125 Page 206 Text v 19 http //www biodiversitylibrary org/page/35328167 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 35328167 dc identifier http //biodiversitylibrary org/page/35328167 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 N02/12646223504 2015-08-27 11 54 10 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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