58 DR. A. R. DWERRYHOESE ON INTRUSIVE ROCKS | Feb. I909, 



The actual contact in Force Gill is obscured by loose blocks which, 

 however, include masses of the marginal varieties, from which it is 

 assumed that the junction is a normal one and not faulted. There 

 are in this neighbourhood many faults usually bearing ironstone, 

 and numerous old drifts where this has been worked. 



The line then passes by Low Ground to the eastern end of 

 Devoke Water, and thence for about 2 miles in a westerly direction, 

 being faulted along this section. It then turns sharply southwards 

 and runs along the western flanks of Birkby Fell, Knott, Stainton 

 Fell, Wabberthwaite Fell, Corney Fell, and Prior Park, to the head 

 of Kinmont Beck, being obscured by Glacial deposits along much 

 of the distance. It then bends to the west, and runs nearly 

 parallel to the road as far as Hinning House near Bootle. 



At Hinning House the boundary turns northwards and abruptly 

 changes its character, the granite being overlain by the St. Bees 

 Sandstone on the west, and continues to the north by Wabber- 

 thwaite to the neighbourhood of Ptavenglass, where in the park of 

 Muncaster Castle the Borrowdale rocks again emerge from beneath 

 their covering of Trias and appear in contact with the granite. 



From Ravenglass the junction may be roughly located and 

 traced by Miteside, Irton Hall, and Mecklin Park to the foot of 

 Wastwater, but is much obscured by drift and alluvium. 



Junction with the Ennerdale Granophyre. 



As already stated (p. 56) the granite comes into contact with the 

 Ennerdale Granophyre near Easthwaite Farm. The contact is 

 some 2000 feet in length, and extends from the foot of Wastwater 

 to the neighbourhood of Easthwaite. 



In no place could I see the actual junction, nor did I collect any 

 junction-specimens from the loose boulders which cover the ground. 

 A mixture of scree of a very coarse type, with Glacial deposits and 

 torrent-gravels, the whole being covered in summer by a dense 

 growth of bracken, renders the investigation of the boundary 

 extremely difficult. I was, however, able to localize the line of 

 junction within about 30 yards. At their nearest exposures the 

 granophyre was normal in type, but the granite showed marginal 

 features. 



Both the rocks being acid in composition and unlikely, therefore, 

 to show any marked results of thermal metamorphism, it is im- 

 possible at present to say which rock is the older ; while the fact 

 that the granite shows marginal features near the junction is 

 consistent with either of the following views, namely : — 



(a) That the granite was intruded into the Borrowdale rocks, which already 



contained the granophyre in a solid condition. 



(b) That the granophyre was the later intrusion and that it came into 



contact with, but did not invade, the granite. 



The granophyre is, as a rule, much fresher than the granite, and 



