394 C. CALLAWAT ON THE KEWEE GNEISSIC 



the steep western face of the faulted Hebridean, and is repeated 

 more than once by step faults. Just below the col on the eastern 

 side of the ridge the gneiss is exposed, proving to demonstration 

 that the quartzite beds are not continued to the east. 



At the col is a plateau paved with the Annelidian Quartzite dipping 

 gently down from the peak of Coniveall, i. e. to the JST.W. Rising 

 on the east side of this plateau is a cliff 200 ft. high, composed of a 

 repetition of the Seamy Quartzite, with interbedded igneous rock. 

 This band appears to be continuous with beds which roll down 

 from Coniveall ; but the slopes up to the peak are too thickly masked 

 by quartzite fragments to permit the examination of rock in place. 



While ascending Coniveall from this pass, we have to our left 

 the sharp ridge which connects this peak with Ben More proper, 

 and we can clearly see the capping beds of quartzite, lying horizon- 

 tally, or dipping gently in an easterly direction. The summit of 

 Coniveall is composed of the Seamy Quartzite, with low north-easterly 

 dip ; but on the south-east side the dip is south-easterly. The quart- 

 zite is thus seen to dip with the slopes of the mountain on the three 

 accessible sides ; the fourth, the south-western, a lofty precipice, is 

 the upthrow side of the Balloch fault. 



Ben Uarran (2644 ft.). — This ridge is a spur of Ben More, pro- 

 jecting towards the north-west. According to Dr. Heddle, it is 

 formed of an anticlinal fold. I have observed that the plateau along 

 the summit consists of the Quartzite, in part, at least, Annelidian, 

 and that this rock plunges down on the S.W. side ; but I have not 

 examined the N.E. slope. I have, however, no doubt of the accu- 

 racy of Dr. Heddle's description, since it corresponds with the 

 normal structure of the Assynt mountains. The old gneiss reap- 

 pears at the N.W. end. 



Gnoc-an-drein. — This hill is really a part of the Glasven ridge, 

 separated from the main mass by the narrow col occupied by the 

 Burn of Calda, and running out to the S.E. to meet Ben Uarran. 

 The quartzite in which it is enveloped rolls off in sheets to the 

 S.W., S.E., and N.E. ; but to the N/W. the outcrops of its beds form 

 a semicircular escarpment facing Glasven. At Calda Burn the Hebri- 

 dean emerges, rising up into Glasven ; and the quartzite is seen to 

 wrap round the old gneiss, just like a shoe enclosing the foot, with 

 the instep showing above. 



Glasven. — From the Burn of Calda nearly to the summit, the ridge 

 is all Hebridean, the final elevation only being capped by the quartzite. 

 The spur to the N.W., which I did not examine along the top, is 

 shown in Dr. Heddle's map as an anticlinal saddle • but the old 

 gneiss reappears at the end, where the ridge falls down on Loch na 

 Gamvich. 



Ben Uie (Uiclhe) (2384 ft.). — This ridge, which runs parallel to 

 Glasven on the east, I did not visit. On Dr. Heddle's map it is re- 

 presented as " Logan Rock" on the east side, with quartzite capping 

 the summit and dipping down to the north-west. Messrs. Eccles, 

 Miall, and Tiddeman, who examined the western slope, informed me 

 that the quartzite occurred in at least -one overthrown fold. This 



