102 



MR. E. B. BAILEY OlS" THE STRIJCTrEE OF [vol. Ixxviii, 



His words are very true, for in the interval few of the geologists 

 who worked under him have resisted the belief, although Clough 

 in this, as in so many other directions, Avas a notable exception to 

 the rule. Clough pointed to his Carrick- Castle Fold as a warning, 

 since structural superposition in the two limbs of this fold naturally 

 gives contradictor}^ results if it be employed as an index of relative 

 age (1897, p. 86). With increasing knowledge of the complexity 



Fig. 4. — The two great folds of the Iltay Napjpe. 



of Highland structure, it is not too much to say that the difficulty 

 of resisting the temptation of arguing from superposition to 

 relative age has steadily diminished. Clough's criticism can be 

 applied with great force, for instance, in the comparison of the 

 Loch-Tay region and the Islay Archipelago. Here, again, the 

 order of the superposition in the one case is the very reverse of 

 what it is in the other (fig. 4). 



