﻿156 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jan. 9, 



cation, however, is but partial, and I am inclined to look upon the 

 brecciated rock as a portion, of an ancient beach or talus derived 

 from the syenitic ridge. We observed a thin band of black horn- 

 blendic schist in contact with the syenitic breccia ; and both these 

 rocks have undergone so much derangement as to dip at an angle 

 of 58° into the hill. 



On reference to the section, we find a mass of syenite (at 10 m. 

 711 yds.) constituting the external walls of a nucleus which forms 

 the centre of the Malvern range, and which nucleus is of great 

 interest to the geologist and mineralogist. The thickness of the 

 syenitic crust on the eastern side of the Malvems is 125 yards. It 

 is much broken, and will require bricking and roofing in the tunnel. 



Traversing the syenite, we found a bed of chloritic rock (at 10 m. 

 792 yds.) with a vein of shining, coal-black, graphite-looking schist 

 in contact, see fig. 2. Another wall of syenite is succeeded by a 



Fig. 2. — Section in the Mal- 

 vern Tunnel, showing veins of 

 Quartz and Graphite in the band 

 of Chlorite in the Syenite, at 10 m. 

 792 yds. By Capt. Selwyn. 



Fig. 3. — Section in the Mal- 

 vern Tunnel, shoiving veins of 

 Felspar in the Greenstone over- 

 lying black homblendic or dioritic 

 rock, at 10 m. 1012 yards. By 

 Capt. Selwyn. 



a. Syenite, 



b. Greenstone and Felspar- veins. 



c. Homblendic rock. 



vein of chlorite with highly crystallized bands of syenite. Here 

 the syenite again sets in in a solid mass, and we pass onwards to a 

 mass of greenstone (10 m. 909 yds.) of the hardest material, and 

 160 yards thick. The greenstone appeared to me to have been 

 injected when fluid into a fissure in the syenite, the syenite being 

 fissured in a line with the range of the Malvems. It is worthy of 

 remark that the syenitic rock is much crystallized where it is in 

 contact with greenstone. 



Leaving this mass of greenstone, we find a remarkable black and 

 greenish rock (homblendic), containing many veins of red felspar. 

 It has greenstone on both sides. This great amount of change in 

 mineral structure in so narrow a compass could hardly have been 

 imagined, had not the interior of the Malvems been laid open to 

 our investigation. See fig. 3. 



"We pass next into a strong rock of syenite (10 m. 1037 yds.), 

 147 yards in thickness, and which we may consider as the external 



