GEOLOGY OP THE VICINITY OF DUBLIN* 281 



Kinshela, are on the southern range of this district and of 

 the county of Wicklow ; and gold has been found within it, 

 at another mountain also named Croghan, about seven miles 

 to the northward of that pace*. 



The occurrence of tinstone at the ** Gold-mine", where Tinstone. 

 it has been obtained in fragmeutsf, is a fact which deserves 

 attention ; for from the great extent of primitive country in 

 the Wicklow mountains, the probability of finding veins of 

 titistone there are considerable. Porcelain earth in purity Porcelain 

 equal to the " China clay" of Cornwall has been found in 

 the lands of Kilranelagh,. on the south-western side of this 

 county; and granite in a state of decomposition is found so 

 extensively in other parts of it, that this valuable production 

 may very probably be obtained there in considerable quan- 

 tity. 



The country around the village of Bray, at the distance Beds of schist 

 often miles from Dublin, presents within a small space an "^°" gfan^e* 

 instructive series of rocks ; and the appearances observable 

 at Killiney, first noticed I believe by Dr. Blake of Dublin, 

 particularly deserve attention. Schistose beds are to be 

 seen at that place to a considerable extent reposing upon 

 gfanite ; and the line of junction, which begins here at the 

 seaside, may be traced by the eye for some miles across the 

 country. The regularity of this junction is remarkable on 

 the top of Rochestown hill, adjoining that of Killiney ; 

 where ledges of granite, against the foot of which the incura-» 

 bent rocks incline, present in several places a rectilinear 

 course for many fathoms together. On the shore at the base 

 of Killiney hill, the granite is traversed by numerous veins, 

 many of which themselves consist of granite ; and in some , 



instances two granite veins, differing from each other and 

 from the mass in fineness of grain and in proportion of their 

 ingredients, are seen to intersect; one vein often deranging 

 the continuity of the other's direction. The substance of 

 these veins is perfectly continuous with that of the mass 

 through which they run, and the surface of the fracture pas^ 

 8CS through both without interruption, 



. ♦Gold 13 said to have been found also in the King's River, near the 

 -village of Holywoo4, in the county of Wicklowr. 

 •}• Report by Messrs. Mills and Weaver. Trans, Dublin Society. 



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