236 BATHYMETRICAL SURVEY OF 



Cambrian limestone rarely appears in the undisturbed area; in the 

 displaced masses west of Glas Bheinn towards the head of Loch Kishorn 

 it is largely represented. 



The evidence bearing on the .post-Cambrian movements obtained in 

 the Loch Maree district is of special interest. On referring to the 

 map, it will be seen that the belt affected by these movements runs 

 southwards from Dundonnell by Kinlochewe, Beinn Eighe, and the 

 Coulin forest to Glen Carron and Loch Kishorn. Throughout this 

 area the geological structure is extremely complicated, but certain 

 sections may be referred to as illustrating the continual variation in 

 the relations of the rocks. The simplest type is met with in the 

 Dundonnell forest, where on the west slope of Creag Rainich there are 

 two powerful thrusts running parallel with each other for some distance 

 in a north-north-east and south-south-west direction. West of these 

 lines of displacement the Cambrian sequence is undisturbed from the 

 basal quartzites to the Fucoid beds. On the horizon of the latter the 

 first powerful thrust is met with, which brings forward a slice of 

 Torridon Sandstone with a core of Archaean gneiss. Not far to the east 

 the second thrust supervenes, which ushers in the crystalline schists 

 overlying the Moine thrust-plane. A repetition of this structure in a 

 more complicated form is found in the tract between Glen Fhasaigh 

 and the heights of Kinlochewe, where the mass of displaced gneiss 

 with its intrusive dykes is admirably displayed between the Moine 

 thrust to the east and the outcrop of the Kishorn and Kinlochewe 

 thrust-plane west of Ben a' Vuinie. 



In the region stretching south from the head of Loch Maree by 

 Beinn Eighe and the Coulin and Achnashellach forests to Loch Kishorn 

 the structure is more complicated. For to the west of the two great 

 lines of displacement just referred to, which have been traced south to 

 Loch Kishorn and Glen Carron, the Torridon Sandstone and Cambrian 

 strata have been repeated by a series of inverted folds and minor 

 thrusts. Hence we find strips of Cambrian quartzite alternating with 

 Torridon Sandstone, the strata having a general dip towards the south- 

 east as if they formed part of a normal ascending sequence. The clear 

 sections, however, on Beinn Eighe, on Sgurr Dubh, Beinn Liath Mhor, 

 Sgurr Ruadh, and other peaks, show the overfolding and reversed 

 faults which are the prominent features of the structure of that region. 

 Still further south, towards the head of Loch Kishorn, and west of the 

 slice of Archaean gneiss overlying the Kishorn thrust-plane, there is a 

 constant repetition of the Fucoid beds and Cambrian limestone by 

 inverted folds and reversed faults. 



In the Loch Maree district, as in Assynt, there is evidence of 

 the development of new structures resulting from the post-Cambrian 

 movements. The deformation of the Torridon Sandstone, west of the 

 Moine thrust, is well displayed in the stream south of the Kinlochewe 



