216 Proceedings of the Royal Iriah Academy. 



composite origin is, however, almost too obvious ; and some authors 

 might, on this ground, exclude it from the category of gneiss. 



In the east of Toome the rock-surfaces of the granite show a 

 feehle fluidal foliation, witli some inclusions of schist lying at various 

 angles, and not drawn out in the mass. Blocks of schist and diorite 

 are common as inclusions down the east side of Toome Lough ; and 

 thence we may proceed to trace the junction on the south side of the 

 Gweebarra. 



East of the iron bridge (which is not represented on existing 

 Ordnance maps) a small section in the cliff illustrates how the promi- 

 nent foliation of the granite may be due to flow, and not to shearing 

 movements affecting it in company with the associated schists. The 

 rocks invaded by the granite are limestones and shales preserving 

 their original bedding ; but the granite has become foliated parallel 

 to its junction witli the sediments, and across their planes of 

 stratification. 



On the picturesque ascent of Cleengort Hill through Kincrum, the 

 granite contains biotite, and is locally foliated ; lumps of schist are 

 freely included along this serrated junction. On Cleengort Hill, the 

 schist is more highly altered and more obviously micaceous.^ In part 

 it contains kyanite and garnet, and these are accompanied by the same 

 handsome brown biotite as occurs in the kyanite-schist of Trusklieve. 

 The kyanite-schists are distinctly felspathic, and probably owe some 

 material to the granite veins associated with them ; these are clearly 

 traceable in hand-specimens, but tend to disappear in microscopic 

 sections, owing to the delicate character of the intermingling. 



On the crest of Cleengort Hill there is an easily traceable junction 

 of granite and schist ; the former rock is foliated parallel to the junc- 

 tion, and is at the same time rich in obvious inclusions from the schist. 

 It would seem unnecessary to multiply such examples had not the 

 later metamorphic stresses been called in to account for the phe- 

 nomena across so wide a stretch of country. Where fragments of the 

 aphanites or epidiorites from the schist-series have been caught up as 

 inclusions in the granite, they prove to be rich in dark green horn- 

 blende, which ophitically includes some of the associated quartz. An 

 older saussuritised felspar is seen in microscopic sections, side by side 

 with recrystallized plagioclase and granular quartz. Seeing that the 

 original pyroxene-dolerites of the Dalradian series were metamor- 

 phosed into epidiorites prior to the intrusion of the granite, it is diffi- 



1 Compare J. E. Kihoe, in Mem. to Sheets 3, 4, 15, etc., p. 46. 



