BEN-LAWERS. 359 



nate minerals, which characterize that forma- 

 tion. — At Killin, the river in forcing itself over 

 the edges of the strata, presents an uncommonly 

 striking appearance, which heightens the effect 

 of the beautiful scenery all around. On the 

 acclivity of 



BEN-LAWERS, 



the strata consist of an older rock, which is rather 

 thick slaty, approaching to gneiss, and which ex- 

 hibits minute undulation, in many forms. Specks, 

 too, appear of iron-pyrites decomposing. Granu- 

 lar limestone is found at the foot of the moun- 

 tain near Loch-Tay ; and towards the bottom of 

 the north side, clay- slate is said to occur. At the 

 summit, the mica-slate has a yellowish tinge : 

 And we find particular beds in which the granu- 

 lar quartz predominates, almost to the exclusion 

 of every other ingredient. This variety has some 

 resemblance to a sandstone. 



The waving structure just noticed, has been 

 mentioned as a proof, that the rock itself had 

 once existed in the state of a flexible and tena- 

 cious paste softened by heat. Supposing, how- 

 ever, what is admitted on all hands, that strati- 

 fied matter, could have been deposited in horizon- 

 tal or straight laminae ; is it not easily conceiv- 

 able, and in truth, the necessary result of me- 



Z4 



