1914-1915.] 



153 



they spent most of the evening in examining the exposure of 

 Permian rocks which occur there. The zoologists were fortunate 

 in finding many fine specimens, which the previous night's storm 

 had stranded on the shore. After tea a short business meeting was 

 held — Dr. A. R. Dwerryhouse, Vice-President, in the chair, when 

 a vote of thanks to Mr. F. A. Heron was proposed by Mr. W. H. 

 Phillips, seconded by Mr. Joseph Maxwell, and responded to by 

 Mr. Heron. 



TRASSEY VALLEY AND DIAMOND ROCKS. 



The second excursion took place on 30th May, when forty- 

 three members and friends went to Newcastle by the 9-35 a.m. 

 train. Mr. Robert Bell and Mr. Josesh Maxwell were the con- 

 ductors on this occasion. On arrival the party proceeded by 

 brakes to the Trassey Bridge, en route for the Diamond Rocks. 

 The brakes were left behind at the Trassey Bridge, and the 

 remainder of the excursion was continued on foot. In about half 

 an hour the Hare's Gap, the narrow col joining Slieve Bearnagh 

 and Slieve-na-Glogh, was reached, and alter lunch the journey was 

 continued right over the Gap and round the southern slope of 

 Slieve-na-Glogh to the Diamond Rocks. With the help of some 

 quarrymen working near at hand all began to search for the 

 minerals which are the special characteristic of the granite in this 

 locality. Many specimens were found, and the members were 

 able to bring home more or less excellent examples of beryl, topaz, 

 smoky quartz, mica, and also the commoner minerals. 



During the afternoon Dr. Dwerryhouse gave a short address, 

 in which he dealt with the geological features of the Mourne 

 Mountains. They are largely composed of granite intruded through 

 Silurian grits and slates. The Silurian originally formed a dome 

 right over the granite, and patches of it can still be found on the 

 'sides and summits of the mountains. Dr. Dwerryhouse then 

 explained in detail how the drusy cavities or geodes were formed 

 in which the crystals occur. He also gave a short summary of the 



