482 RUM. GEOLOGY. 



been described in the same places. But tracing its 

 progress through Rum, it may be seen from the point 

 already mentioned, following in a regular series of beds 

 to Loch Scresort. It constitutes the shores of this bay, 

 and may also be traced high up into the country on 

 the sides of Halival, as well as into a lower class of 

 hills which rises to the south and west of Loch Scresort. 

 The highest point at which it was observed was esti- 

 mated at 1200 feet. On the shores of Loch Scresort the 

 beds are perfectly even and parallel, with an uniform 

 inclination. This character is maintained for a con- 

 siderable space through the hills; but at length they 

 become waved, broken, and disturbed in various ways, 

 displaying in some places violent contortions ; all these 

 irregularities occurring in the neighbourhood of the great 

 masses of trap. The veins of the same substance which 

 are common throughout them, seldom or never produce 

 any marked disturbance. Towards the north, Loch 

 Scresort is bounded by a high hill, which extends 

 along that shore as far as Camispleasig, and displays 

 the regularity and inclination of the sandstone beds to 

 great advantage. They incline, as already said, towards 

 the north-west, the angle of elevation varying between 

 twenty and thirty degrees. The southern declivity of 

 this hill consists of the protruding ends of the strata, 

 which follow each other like stairs to the summit; the 

 declivity at the opposite side being formed by the inclined 

 surfaces of the uppermost beds. From a rude estimate 

 of the number of these strata compared with the apparent 

 dimensions of each, the thickness of the mass may be 

 estimated at 600 feet. This is however but a portion 

 of the whole deposit, since there are many beds in 

 a lower position between this point and the schistose 

 strata already described. It is also probable, that of 

 the beds which follow on the north shore toward the 

 west, many belong to still higher parts of the deposit; 

 and that its thickness is consequently far greater than 



