50 Dr. Mac Culloch's Sketch of the 



nates with the trap in the same manner as it does in Egg j and in 

 this neighbourhood it also exhibits the same appearance of glo- 

 bular concretions which occur in that little island. It also is found 

 in several places, containing globular masses and fragments of trap, 

 such as are frequent in the similar sandstones, which are seen on the 

 opposite coast of Raasa. The same appearances continue along the 

 shore to Camiskanevig ; and although I did not approach the land 

 sufficiently near to be certain of the fact, I am inclined to think 

 that similar arrangements exist all the way to the Altavig islands. 

 Sandstone is found moreover on the eastern side of Loch Snizort ; 

 and, I may add, generally on the western shore of Trotternish, par- 

 ticularly at Duntulm, where it contains shells, of which, for the 

 reason mentioned in speaking of the limestone, I neglected to take 

 a sufficient note, not being aware that they might be of future im- 

 portance in my researches. Here however it alternates with shale j 

 and, unless I am mistaken, with very thin laminae of coal, such as 

 occur in the sandstone of Egg, while it also contains imbedded 

 fragments of charcoal, and I am therefore inclined to think on 

 these indications, that this sandstone belongs to a deposit still su- 

 superior to that of Strathaird, and probably the same as that 

 which is found in Egg. The last white sandstone which I met 

 with was in Glamich, where it was penetrated by veins of trap 

 and mingled with the mass of the hill, but the space I saw exposed 

 was so very small that no conclusions could be drawn from it. 



I must not terminate the description of these strata without pointing 

 out a circumstance of importance which might otherwise escape 

 the reader's attention, namely, the conformity of all these rocks. I 

 will omit that Conformity which in some places appears to exist 

 between the mica slate and quartz rock, and the incumbent ones, 

 because it is certainly incomplete ; but between the bed which 

 consists of blue quartz rock and slate, and the red sandstone, it is 



