1859. ) MUECHI90N — NORTH HIGHLANDS. 235 



viewed from Glach-adherie, or the Valley of Storms, all these masses 

 can be clearly observed dipping together to the east. The general 

 accuracy, therefore, of the section of Mr. Cunningham seems to me 

 to be confirmed by an appeal to Ben Amoboll, if the hill which 

 lies to the east of Drumtungi be that to which that author referred. 



Here we see the quartz-rock and limestone conformably super- 

 posed by what few geologists would call gneiss, but which would 

 by most be named chloritic, talcose, and micaceous schists ; these 

 strata, whatever be their mineral character, are riddled by the in- 

 trusive rock, and in parts much altered and hardened, without pro- 

 ducing any discordance between them and the subjacent quartz-rock 

 and limestone. The manner in which the strata are affected at 

 different parts of this Hill of Arnoboll is thus represented by Prof. 

 Harkness. In the one case the quartz-rock and limestone arc seen 

 dipping conformably to the east against a large mass of eruptive 

 felstone (fig. 11). In the other (fig. 12), the upper portion (the 



Fig. 11. — Section of the Quartz-rocks and Felstone at Amoboll. 

 N.W. ^r S.E. 



1. Upper Quartz-rock. 



2. Upper Limestone. 



3. Uppermost Quartz-rock. 



4. Felstone (granitic). 



quartz-rock) is seen to be followed on the east by altered schists or 

 gneiss, both in the body of the intrusive rock* and at its eastern 



Fig. 12. — Section at Amoboll. 



Upper Quartz-rock, dipping 

 40° E. 

 2. Gneissieslrata, clipping 40 K 

 ."'.. Mass of gneiss enclosed in 

 the granitic felstone. 

 y ^ YC ^£ y< *f ^ - 4. Felstone (granitic). 



flank: all the strata, however, whether broken or metamorphosed, 

 are Been to dip conformably to the east. 



Now, whether the generalized section, fig. 10, which I drew, or 

 the details given by an independent observer, Prof. Harkness, taken 

 from other parts where the eruptive rock is mosi expanded, be referred 

 to, it is obvious that in neither is the easterly ascending succession 

 interfered with. 



These cases are the most remarkable examples known to me, 

 and prove that, whether the intrusive rock shows itself in the 

 bwer quarts-rook, the intervening limestone, the upper quarts-rock, 

 or the overlying schists or so-called "gneiss" (and in the Eribol] 



* Prof. Nicol was indeed quit.- riidit in oeiling attention to the great mass of 



ited igneous rook,whiob Cunningham and myself had perhaps treated too 



lightly. But the very fact of it- existence without producing anj break in the 



genera] succession <>t' the strata is, 1 think, a striking corroboration of our views 



