﻿Yol. 66.] THE SKIDD AW GRANITE AND ITS- METAMORPHISM. 141 



Mr. Whitaker asked whether the Author considered that the 

 three outcrops were part of one mass connected underground at no 

 great depth, and, if so, whether, from the character and amount of 

 the metamorphism away from the granite -outcrops, any estimate 

 could be made of the depth of the granite. 



The Author, in reply, thanked the Fellows for their kind re- 

 ception of his paper, and regretted that time did not permit him to 

 deal with all the interesting points raised in the discussion. He 

 had made a most careful search for kyanite and sillimanite, and had 

 found neither : hence it must be concluded that the temperature of 

 the intrusion was not very high. He believed the intrusion to be one 

 of very large volume, and thought that the three visible exposures 

 were undoubtedly connected at a small depth. As suggested by 

 Mr. Whitaker, the depth of the upper surface of the granite could 

 be approximately estimated at any point, from the observed slope of 

 the outer margin of the aureole. He did not wish to lay any stress 

 on the term ' laccolith,' and suggested that the granite came up 

 along an axis of uplift, of Caledonian strike, which was possibly 

 continuous through the Isle of Man into the South-East of Ireland. 

 The granites of all these districts were very similar in their general 

 characters. With regard to the age of the granite, the Author 

 made no suggestions, from want of data, but believed it to be 

 undoubtedly older than the Carrock Fell complex, which did not 

 seem to be metamorphosed by it. 



