﻿"362 THE REV. J. P. BLAKE ON THE [May 1905, 



from Skyhill joins the River Auldyn from the left. At the base of 

 the crag forming the lower corner of this stream-valley, the slate 

 is worked, ami ascends the crag as far as it is accessible ; the more 

 level ground above this is crossed by a band of breccia, and this is 

 followed farther up by highly-cleaved slate-rock (see fig. 1, below) of 

 rather mongrel-character. This shows a definite ascending sequence, 

 commencing with the Barrule Slate at the base, followed above by a 

 schistose breccia with contained fragments, and ending with a mongrel 

 slaty rock. Prom this spot, if we follow the probable outcrop of a 

 regularly-bedded rock, we recognize the same Schistose Breccia 

 crossing this branch-stream farther up, and on the hill-slope beyond 



Pig. 1. — Section in Glen Auldyn. (Diagrammatic.) 



the valley the same bed may be seen about halfway up the zigzag 

 path. In all these cases the beds geologically above the Schistose 

 Breccia are not well defined, as may be judged by the fact that all 

 three have been included in the area referred to the Barrule Slate. 



Sulby Glen. — The lower part of Sulby Glen stands nearly at 

 right angles to the rest of the valley. Its north-eastern slope 

 exposes a section, of which Mr. Lamplugh writes : — 



' Nowhere can the development of the structure [of the " crush-conglomerate"] 

 and its relation to the accompanying strata be more satisfactorily studied 

 than in these crags. . . . South-eastward it passes gradually into the dark 

 Barrule Slate of Ballaneary, and north-westward into highly-contorted banded 

 slaty and gritty flags ' (op. cit. p. 60) ; 



with the Schistose Breccia occupying a large breadth in the centre. 

 These crags are almost vertical at the summit, and crowded with 

 obstacles, such as thick gorse and slippery bracken; yet we can 

 see that the Breccia is not separated from the Barrule Slate by 

 any mark of motion, but apparently passes into it gradually by 

 the cessation of the fragments. It is different, however, with the 

 contorted flags : these are thrown into the most magnificent folds, 

 visible at a distance, or seen close at hand. The final direction 

 of the upper folds in no way leads towards the breccias, but it is 



