SHUNA. GEOLOGY. 155 







island ; but, as far as I perceived, attended with no pecu- 

 liarities that are not sufficiently described elsewhere. 



Comparing the geographic position of Shuna with that 

 of Seil and Luing, it is apparent that the strata which form 

 it are superior in position to those of the latter, the 

 common dip being to the eastward. If therefore our views 

 were limited to these islands alone, we should conclude, 

 that as the rocks of Shuna were placed above the clay 

 slate of those two islands, they presented an anomaly of 

 position sufficient to excite doubts respecting the accuracy 

 of the observations. But it has been already shown that 

 the same rocks are interposed between two masses of clay 

 slate in the common line of direction which runs through 

 Luing and Seil; and it will hereafter be proved that 

 many similar alternations take place in the islands which 

 remain to be described. But as these observations are 

 of a general nature and apply to the whole group, I shall 

 defer them to that period when a comparison of the whole 

 of these scattered phenomena will be attempted. 



