574 



MR. G. W. LAMPLTJGH ON THE 



[Nov. 1895, 



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305 



across the strike of the con- 

 glomerate, which now appears 

 in the eastern slopes and finally 

 abandons the western side alto- 

 gether at the Glen Mooar bend. 

 It is here very well exposed for 

 about 250 yards in the deep 

 trough cut by a tributary 

 stream which comes in from 

 the east. This stream has no 

 name on the Ordnance map, 

 but the cascade by which it 

 reaches the main glen is known 

 to the country-folk as ' The 

 Cluggid' ( = throat). East of 

 the conglomeratic belt this 

 gully and its craggy walls are 

 composed, for the next ^ mile,, 

 of compact dark slate with 

 imperfect cleavage and faint 

 traces of contorted bedding, 

 after which for a few yards 

 the crush-material is again 

 revealed, and beyond this some 

 flaggy grits are encountered. 

 This arrangement is very sug- 

 gestive of the acute folding of 

 the brecciation-plane. 



The crags lying in the fork 

 between Sulby Glen and the 

 Cluggid exhibit a continuous 

 section across the strike of the 

 brecciated zone, as shown in 

 the accompanying illustration 

 (fig. 9), and I know of no place 

 where the character of the 

 structure and its relation to- 

 the surrounding strata can be 

 so satisfactorily studied. Every 

 stage in the breaking-up of 

 the highly-contorted grits and 

 banded sandy slates which 

 form the northern part of the 

 exposure can be distinctly 

 traced, and in places amid the 

 mass of the breccia there are 

 isolated patches of still coherent 

 beds from a few feet to a few 

 yards in diameter. Occasionally 

 in these crags, as also in sec- 

 tions elsewhere, there may be 

 seen a distinct U- or V-shaped 

 arrangement of the grit-frag- 



