336 SKY. GEOLOGY. SECONDARY STRATA. 



produced the disturbance and change of texture among the 

 surrounding sandstone strata. 



In describing the limestone of Strath I remarked, that 

 although the linear direction of the strata appeared 

 tolerably perfect wherever they could be fairly investi- 

 gated, yet its boundary toward the sandstone was 

 irregular. The extent of that irregularity is much en- 

 larged by including the present portion, but for this it 

 will be more explanatory to consult the accompanying 

 map. 



The next portion of limestone* to be found in Sky, 

 is so widely and completely separated by the intermediate 

 overlying rocks, from the great deposit of Strath, that 

 it is impossible to trace any continuity between them, 

 or to draw any inference respecting their identity, except 

 by a comparison of their structures, or by a circuitous 

 connexion through the neighbouring islands, where the 

 same rocks are found in a more continuous and intel- 

 ligible state. This occurs on the southern shore of Loch 

 Sligachan, which it skirts to a distance marked in the 

 map, forming a very low range of subsidiary hills at the 

 foot of Glamich. The space occupied by it reaches but 

 to a short distance from the mountain, where it is lost 

 in the trap and syenite that form the mass of this and 

 the neighbouring hills. In one or two places its junction 

 with the overlying rocks may be seen, but so obscurely, 

 that their connexion is inferred chiefly from former ex- 

 perience of similar phenomena. It is also important 

 to remark, for the purpose of hereafter connecting this 

 limestone with the strata which follow, that high up in 

 the mountain a portion of white calcareous sandstone 

 is found entangled in the trap. 



The direction of the calcareous beds is north-easterly, 

 and in this respect they correspond with those formerly 

 described, as well as with the neighbouring and similar 



* Plate XIV. fig. 1. 



