Keywords: The Quarterly journal of the Geological Society of London (12645862633).jpg NICOL SOUTHERN GRAMPIANS <br> 201 <br> in the lower valleys by detritus and occa- <br> sional convolutions North of the Inn at <br> the Spittal I found a black carbonaceous <br> shale in highly contorted beds but dipping <br> 60° to N 12° W This rock closely resem- <br> bles the black shales of Oban and Easdale <br> described by me in 1858 It appears to <br> overlie the mica-slate and thus confirms <br> the view that the clay-slates are the higher <br> and newer formationf The part of the <br> section however to which I wish specially <br> to refer lies further up the glen and on to <br> the Braemar Mountains The slates con- <br> tinue up Glen Beg to the foot of the steep <br> pass over the Craig AVell Here a bed of <br> bluish-grey limestone with numerous veins <br> of calc-spar crops out dipping at a high <br> angle to the north-west This is overlain <br> by beds of gneiss passing up into quartzite <br> which forms the higher portion of the <br> mountains Near the summit-level of the <br> ridge veins of red felspar-porphyry are seen <br> running from E 30° to 35° N to W 30° to <br> 35° 8 Further down near Ben Turk <br> Bridge a grey micaceous limestone appears <br> dipping at 70° to S 45° E From this place <br> to Braemar the lower part of the valley con- <br> sists of gneiss with veins of granite but <br> overlain by beds of blue or grey compact <br> limestone and this in turn by a white <br> quartzite or altered sandstone often much <br> iron-tinged The whole of the formations <br> seem to be conformable and though occa- <br> sional high angles occur yet taken generally <br> they dip at low angles to the south-east <br> The gneiss appears merely the more meta- <br> morphic lower portion and the quartzite <br> the less metamorphic and higher portion of <br> one great formation Further north beyond <br> the River Dee as shown in the section it <br> rests still at very low angles of from 5° to <br> 10° or 15° on the granite of the Ben-Mac- <br> 2 o <br> Cb <br> s <br> °5 <br> V <br> -J <br> M <br> pq <br> Quart Journ Geol Soc vol xv 1858 p 111 <br> t I described this rock at the Meeting of the Bri- <br> tish Association in Aberdeen in 1859 see Eeport of <br> that Meeting Transactions of the Sections p 118 <br> and exhibited some fine specimens presented by Mrs <br> Farquharson of Invercauld It has since formed <br> the subject of a paper by Sir E I Murchison and <br> Mr G-eikie Quart Journ Geol Soc vol xvii 1861 <br> pp 226 232 35328162 109632 51125 Page 201 Text v 19 http //www biodiversitylibrary org/page/35328162 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 35328162 dc identifier http //biodiversitylibrary org/page/35328162 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 N02/12645862633 2015-08-27 11 58 21 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 |