﻿380 ME. T. 0. B0SW0ETH ON METAMOEPHISM [Aug. IQTO,- 



II. Ihpeegnation of the Pelitic Gneisses with Geanite. 1 



(a) The Intrusion of the Granite. 



The very intricate line of junction between the granite and the 

 gneisses has a general trend which cuts obliquely across their strike 

 in a north-and-south direction. The relations between the granite 

 and the schists are of extreme complexit}', veins and even isolated 

 patches of granite occurring in the schist half a mile or more away 

 from the generalized boundary-line ; while masses and fragments of 

 schist, of all sizes up to 200 or 300 yards in length, are found included 

 plentifully in the midst of the granite area. 



Fig. 2. — Folded Moine Schists with granitic intrusions along the 

 bedding, slightly swollen at the apex. 



[The scale is a foot-rule. Tb 



T. O. B. 1908. 



__ white lines round the margin indicate the 

 positions of some of the intrusions.] 



These inclusions, which commonly retain their north-easterly 

 strike, are most numerous in the eastern, southern, and central parts, 

 but are comparatively scarce in the north and west. Near the junction 

 they are often so abundant as to form massive injection-breccias. 2 



1 The following account of the penetration of the schists by granite applies 

 only to a narrow tract at the granite margin, not exceeding a few hundred 

 yards in width. 



2 Good examples occur 40 yards south-west of Knock-na-fenaig and half a 

 mile south-south-east of Bendoran Cottage (a mile and a quarter west of 

 Bunessan). 



