226 



C. CALLAWAY ON THE GEAXITIC AIST) 



felspar has probably been con- 

 verted into sanssurite, a change 

 which would, of course, support 

 my suggestion ; but he does not 

 consider that the slide examined 

 by him displays CTidence of a 

 junction. However, I leave my 

 hint to be confirmed or refuted 

 by further observation. Except 

 in the immediate vicinity of the 

 granite, the rocks are ordinary 

 mica-schists, at first dipping 

 away from the granite, and then 

 bending up to the X.X.W., in 

 accordance with the usual dip of 

 the rocks west of the promontory. 

 These schists are also contorted 

 on a smaller scale, and penetrated 

 by veins of quartz and a coarse 

 granite. The section thus ap- 

 pears to furnish another example 

 of the intrusion of the granite. 



Section in the road north of Dun- 

 leiuy {Protestants Church 

 (fig. 3). 



This locality is also at the west- 

 em margin of the granite, but 

 ten miles further south. Com- 

 mencing east of the road, where 

 it begins to turn round to the 

 north, we leave the granite, 

 which is coarsely crystalline and 

 unfoliated, and, on the other side 

 of the road, come to mica-schist, 

 containing a mineral which 

 Prof. Bonney thinks may be allied 

 to kyanite, and he agrees with 

 me that this mineral may be the 

 result of contact-alteration. This 

 rock dips north-westerly, and is 

 followed by quartzose schists 

 highly contorted, and penetrated 

 by a vein of fine-grained granitoid 

 rock. Then follow in succession 

 friable schists, a thin, band of 

 limestone, and lead- coloured 

 mica-schists, repeated again and 

 aa-ain bv folding and fracture till 



