380 



C. CALLAWAY ON THE NEWEK GNEISSIC 



S 



© 

 &2 



SO 



Section up the Cascade from 

 Dliuloch More (east end of fig. 5). 

 — The facts here described occur 

 within one mile to the south of the 

 section to which reference has just 

 been made. They are well seen 

 in the wild gorge occupied by the 

 infant Oykel as it cascades down 

 from the elevated tarn of Dhuloch 

 More (1500 feet). The bottom of 

 the valley (900 feet) is formed of 

 the Quartzite, which sweeps down 

 in undulating sheets from the 

 lofty ridge of Brebag. The dip is 

 E.jST.E. at 15°. This rock is con- 

 tinued up the stream to about 

 1000 feet, where it is conformably 

 overlain by Brown Flags, Salte- 

 rella-qivdrtzite *, and between 20 

 and 30 feet of the Dolomite. 

 Thus far the succession is normal. 

 "Resting on the Dolomite, appa- 

 rently in conformable succession, 

 is about 100 feet of reddish 

 felspathicgrit(Nos. 92, 93, p. 417), 

 which, towards the top, rises in 

 dip to nearly 90°, and is overlain 

 by red and green gneiss, with ob- 

 scure bedding. A little higher up, 

 this gneiss dips easterly at a low 

 angle ; and following it to the 

 high ground above, it is seen to be 

 continuous with that which forms 

 the chief mass of Ben More. 



The grit, overlain by similar 

 gneiss, rather soft and decayed, can 

 be traced for more than two miles 

 to the south along the steep 

 escarpment which overhangs the 

 eastern side of the Oykel valley. 

 The gneiss forms the vertical cliff 

 crowning the scarp. Below it the 

 grit occupies the slope, and is ex- 

 posed in several small cascades. 

 Towards the south, green grit 

 begins to be intercalated with the 

 red variety ; and on the stream 

 from Dhuloch Beg the colour is 



* This band, owing to its thinness, is 

 not always inserted in the sections. 



