46 Dr. Mac Culloch's Sketch of the 



the beds of this substance, which are visible along various points 

 of this shore as far as Sligachan, are equally continuations of the 

 shell limestone, more particularly as the marble limestone is also 

 found at Sligachan in that position in which it might be expected 

 with respect to the former. But I can give no clue to the history 

 of the limestone which is entangled among the trap to the north of 

 Broadford, having neglected to make such an examination of it as 

 would have been required for this purpose. I must trust to some 

 future geologist for the completion of what I have left unfinished. 

 The most remarkable of these unascertained beds is found to the 

 north of Portree, far inland, and extending towards the Storr on 

 the eastern declivity of that range of hills, being interposed among 

 enormous beds of trap. Others may be seen in various position^ 

 accompanying the secondary strata which lie under the trap on 

 the shores of Trotternish ; but as I can not pretend to give such a 

 geological description of them as would satisfy myself, I must be 

 contented with this cursory indication of their localities. I have 

 little doubt that with the clue which I have now furnished, the 

 task of assigning their geological relations will be found easy. 



I find some difficulty in continuing the pursuit of the stratified 

 rocks upwards from Loch Eishort, because a great geographical 

 chasm now takes place between those already described, and the 

 next most extensive mass which forms the promontory of Stra- 

 thaird, and because they are connected but by a small indication of 

 their order of succession. In the general description I have noticed 

 that the rocks of Strathaird consisted chiefly of sandstone, alter- 

 nating with thin and rare beds of limestone : these I conceive to 

 be the next in order of superposition, and the proof rests on this. 

 At the point which separates Loch Slapin from Loch Eishort 

 a series of sandstone bed« is found following the limestone lately 



