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| Keywords: The Quarterly journal of the Geological Society of London (12733772585).jpg J W JUDD ON THE SECONDARY ROCKS OF SCOTLAND 265 <br> makes it a rather conspicuous object Its summit is occupied by a <br> small loch or mountain-tarn which is said to be of great depth <br> When we examine this rocky mass standing up so abruptly in <br> the midst of the basaltic plateau we find it to be composed of a <br> dolerite of the coarsest grain passing in its lower portions into gabbro <br> The rugged rnsty-brown surfaces of these rocks which resist denu- <br> dation and the growth of vegetation form a striking contrast with the <br> grassy tabular masses of the basaltic lavas in the midst of which <br> they rise <br> The identity in character between this rock mass and others of <br> eruptive origin which we have before described is sufficiently obvious <br> That it was actually upheaved through the older basaltic lava sheets <br> we have the clearest and most unmistakable evidence As shown in <br> the plan and section woodcuts figs 5 and 6 the contact between <br> Fig 5 ” Plan of the Hill of Sarsta Beinn <br> a Ordinary basalts covered by boggy ground <br> b Basalts altered by contact with the intrusive mas <br> c Great mass of coarse dolerite graduating into gabbro <br> Fig 6 ” Section of Sarsta Beinn <br> /z <br> loch /yi <br> a Basalts of the great plateaux <br> b Basalts altered by contact with the intrusive mass c <br> c Intrusive mass composed of dolerite in places graduating into gabbro <br> these highly crystalline rocks and the basalts in the midst of which <br> they lie is marked by a belt of metamorphosed rock The basalts <br> near their junction with the intrusive dolerites and gabbro have <br> acquired a harder texture a splintery fracture and a peculiar platy <br> mode of weathering often in concentrically curved planes In con- 35766160 110599 51125 Page 264 Text v 30 http //www biodiversitylibrary org/page/35766160 1874 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 30 1874 Geology Periodicals Smithsonian Libraries bhl page 35766160 dc identifier http //biodiversitylibrary org/page/35766160 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-24 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12733772585 2015-08-26 19 53 28 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1874 Photos uploaded from Flickr by Fæ using a script | ||||
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