Vol. 59-] 



GRANITE AND GREISEN OF CLIGGA HEAD. 



147 



cline, after which they are bent again into a syncline, the southern 

 limb of which rests against the abrupt wall of schorlaceous killas. 

 The syncline is very clear ; but the anticline would be difficult to 

 make out, were it not for old mine-workings driven along the 

 divisional planes. It is apparent from the actual exposure that 

 the syncline is formed by the granite being ' bedded ' parallel to the 

 surface of killas into which it was intruded ; and that this is the 

 case also with the anticline there is no reason to doubt. 



Fig. 3. — Greisen-bands in the cliff at Oligga.Head. 



The commencement of the anticline may then be considered the 

 base of the granite-tongue, in which the divisional planes are, strictly 

 speaking, ' bedding-planes ' formed parallel to the surface of the 

 1 country ' during the process of cooling. Worth of the anticline 

 the granite may be spoken of as ' the main mass,' where the 

 divisional planes may also be safely spoken of as i bedding/ 



Besides the ' bedding-planes,' trending 20° north of east, a badly- 

 defined series of joints can be seen in a hollow, in the main mass of 



