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| Keywords: The Quarterly journal of the Geological Society of London (12645845013).jpg NICOL SOUTHERN GRAMPIANS <br> 183 <br> more arenaceous or less crystalline and the dip declines to 55° 45° <br> and even to 30° On the east side of the loch near Shandon some <br> beds of clay-slate appear; and the strata dipping first north at high <br> angles then south then again north and finally regularly south-east <br> show that in this place there is probably a faulted synclinal The <br> same irregularity as shown in the section occurs on the west side <br> of the loch but beyond this break the beds have a uniform south- <br> east dip to the clay-slate near Koseneath These slates dip at 40° <br> to S 35° E and appear to consist as in Bute of two divisions the <br> lower micaceous or talcose and of a deep blue or purplish tint the <br> upper of a lighter blue or green with a more silvery lustre Some <br> of the beds resemble a fine-grained greywacke This section and <br> that of Bute show what may be considered the regular normal order <br> of the formations on the south border of the western Grampians <br> First towards the axis of the chain the more highly crystalline and <br> contorted mica-slate covered by less crystalline and more even beds <br> of the same rock and these in turn by talcose or chloritic blue and <br> green clay-slates with occasional beds of greywacke The low and <br> regular dip of the beds and the conformity of the order to the only <br> theory of metamorphic action which seems admissible in the present <br> state of geological science induce me to regard this as the true nor- <br> mal order of these formations <br> 5 Loch Lomond ” The next section I shall notice fig 2 is that <br> Fig 2 ” Section on Loch Lomond <br> N W <br> Ben Lomond Rowardennan Sallachie Auchmar <br> S E <br> Mica-slate <br> a Syenite <br> Clay-slate <br> b Granite <br> Balmaha <br> b c Old Red <br> Sandstone <br> c Limestone <br> seen on the east side of Loch Lomond from Ben Lomond to the <br> Red Sandstone at Balmaha about ten miles east of the one just <br> described <br> Ben Lomond at the northern extremity consists of mica-slate <br> often quartzose much contorted and dipping at low angles and inter- <br> sected by veins of felspar-porphyry Near Rowardennan the strata <br> become more regular dipping at high angles 80° to 85° to S 27° E <br> The rocks are still chiefly mica-slate passing occasionally into a light- <br> grey talc-slate About a mile below the inn some of the beds dip <br> north at high angles and are intersected by a parallel vein of fine- <br> grained syenite composed chiefly of red felspar and dark-green horn- <br> blende At Sallachie Wood a coarse greywacke very hard and full <br> of quartz-veins appears dipping at 80° to S 27° E and thus con- <br> formable to the mica-slates on the north It contains distinctly <br> rounded grains of quartz thus leaving no doubt of its mechanical <br> origin Further on the clay-slate well exposed in the quarries 35328144 109632 51125 Page 183 Text v 19 http //www biodiversitylibrary org/page/35328144 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 35328144 dc identifier http //biodiversitylibrary org/page/35328144 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 N02/12645845013 2015-08-27 11 58 15 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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