82 CROULIN ISLES. GEOLOGY. 



on that subject. But it is nevertheless important to 

 remark, that these islands are no less intimately connected 

 with the adjoining shore of Applecross, as well in geological 

 structure as in geographical position. This district forms 

 the most extensive and the most continuous portion of 

 the primaiy sandstone of the north-western coast ; while 

 the mass of strata of which it is constituted rises into high 

 mountains. These strata do not here, as in Sky and Loch 

 Alsh, alternate with the gneiss, but repose on it ; while 

 they are also generally placed in a more uniform inclina- 

 tion and at much lower angles. Hence they might, on a 

 cursory view, be considered as distinct from those of Sky. 

 But they become connected with them by means of the 

 Croulin islands, which, while they coincide in direction 

 with the strata of Scalpa, are no less coincident with 

 those to which they approximate on this part of the 

 continental shore. Thus the community of the whole of 

 this sandstone, under all its variations of position, may 

 be deduced ; further proofs of which will be offered when 

 the general comparison of these islands with the conti- 

 nent is attempted. 



