112 THE STRUCTURE OF THE [Ch. VT 



of these series respectively dip to opposite points of the 

 compass. 



Such is the disposition of the primary strata on the western 

 coast of Scotland, which is similar to that of the analogous 

 rocks in Cornwall ; and on referring to the details on Nor- 

 way, in the fifth chapter, the gneiss, and other schistose rocks, 

 will be found to exhibit the same characters : we will, there- 

 fore, conclude this topic with one more example taken from 

 the east of Ireland. 



It has been remarked by Mr. Weaver, " that, in following 

 the line of the two Avons, the Daragh and the Avoca, from 

 the granite chain on the west to the sea on the east, the 

 slaty rocks gradually acquire a higher angle of elevation. 

 In the glens, the angle of apposition is from 20 to 25 ; in 

 the meridian of Cronebane, the angle is 65 ; and nearer to 

 the coast, it varies from 70 to 80. On the western side of 

 the mountains, this order is in general inverted, the highest 

 angle being in the vicinity of granite, and the lowest 

 most remote from it, with this additional distinction, that 

 the dip of the slate is commonly opposed to that of the granite 

 declivity on the western side; while, on the eastern, their 

 position is more conformable to the declivity."* In order 

 to show the nature of these dips, it will be desirable to enu- 

 merate several examples from the same author.f Thus, we 

 find, that on the eastern side of the range, the mica-slate at 

 Killiney Bay leans against the granite, and dips from it at an 

 angle of 80 ; at the eastern side of Rochetown road, near 

 the martello tower, it dips in the same direction at 40 ; 

 whilst, on the eastern brow of Rochetown Hill, in a natural 

 hollow in the granite, its dip is 75 : on the southern side of 

 the Scalp, this slate rests on the granite, inclining towards 

 the S. E. at 35 ; but the general mass ranges through the 

 hill, dipping N. of E. at 40 : at Maulin Hill it dips on the 

 summit 25 towards the S.E.; but on the west, near its 



* Geol, Trans., vol. v. p. 178. f Idem, HO. 



