IN GLEN TILT. 329 



from this point for about a hundred yards down the river, and 

 forming at once the bank of the river and the foot of the 

 mountain, which rises about eight hundred feet above it, with 

 more than usual steepness. 1 he rocks, that appear in this 

 scar, are strata, consisting for the most part, either of mica-slate, 

 or, more frequently, of granular limestone penetrated with 

 mica. On a close view, they were found to be much bent ; 

 however, their general stretch may be estimated at about 

 N. 33" E., and is nearly parallel to the course of the channel at 

 this place. Their dip is to the south-east, commonly at an 

 angle of from 30° to 40=', but in one place they are almost ver- 

 tical. 



71. Over against a point fifty yards below the east end of 

 the scar, (at 1 in the plan) the rock begins to shew itself un- 

 der the northern bank. 1 he substance of it has here a base of 

 grey compact dolomite, which serves as a cement to angular 

 pieces of quartz, sometimes so numerous as to constitute the 

 largest portion of the stone. The pieces vary in size, from that 

 of a nut to the smallest grains. This stone lies in a bed 

 stretching about N. 48' E. ; and nearly in that direction from 

 hence, there. is on the other side (at 1) a rock of a similar cha- 

 racter, near the east end of the scar, close to the water's edge ^ 

 so that the bed probably extends across the river *. The dip. 

 of the bed we could not determine. 



72. On the northern bank, a little farther up the stream, (at 

 2 in the plan) the rocks present characters that are various and 

 complex. From near the same spot, I have, one specimen 

 consisting of quartz, penetrated with talc, chlorite, and carbo 



nate 



* In the plan, the bearings of the corresponding substances on the southern 

 bank have in every instance been laid dovm more to the east of north, than is 

 stated in the description. Perhaps, in sketching the channel of the river, it was 

 wade too broad, which would account for the error. 



