IN GLEN TILT. 



375 



slate, stretching N 133" E., and clipping to the north-east from 30° to 

 35". About a hundred and fifty yards above this, is the junction of 

 the Tarff" and the Tilt. 



On the southern bank of the TarfF, fifty yards below the fall nearest 

 the junction of the two rivers, the rock is of granular quartz, contain- 

 ing some felspar, and steatite in the small fissures. It effervesces 

 slio-htly, and seems to be penetrated with carbonate of lime. The stra- 

 tification of this rock is indistinct, but, as far as I could determine it, 

 its stretch is N. 93° E., and its dip southerly 46°. On the opposite 

 bank the rock is of the same character. Its stratification is very indi- 

 stinct, but appears to be horizontal, or rather dipping to the north. 

 On the southern bank, nearer to the fall, there are strata of mica- 

 slate, very distinct, stretching N. lOl" E. and dipping northerly 

 38°. Some of these strata are only thirty yards from the granular 

 quartz, which has nearly the same stretch, and dips at nearly the same 

 angle, but in an opposite direction. As these strata were, no doubt, 

 once conformable, there is reason to imagine that they have undergone 

 an extraordinary convolution, and some fraces of it may be discovered 

 in the intervening face of the bank, though it docs not afford so cleai' 

 a section of the rock, as could be wished. 



3 B 2 XII. 



