270 GEOLOGY AXD PHYSICAL GEOGKAPHY OF THE CAPE COLOJSY. 



the probability of the Stormberg subdivision being Post-Triassic ; 

 for the genus occurred in the AVyanamatta as Tvell as in the Hawkes- 

 bury Beds, and the former were probably Jurassic. 



Dr. Geikte remarked on the superficial reseiiii)lance of the frag- 

 ments of Dwyka Conglomerate to a volcanic mud. The intrusion of 

 sheets of lava between beds of rock without disturbance, to which 

 the Author had referred, would depend mainly on the energy of 

 eruption. 



Mr. Cleiie:n"t Eeid pointed out some differences in the character 

 of the striation between boulders from the Boulder-clay and the 

 fragment from the Ecca Conglomerate exhibited by Prof. Green. He 

 had seen similar striation on Sept aria in tumbled ground, and attri- 

 buted the markings to moving mud or landslips. 



Prof. Hughes would refer the striation exhibited to movements 

 of the mass after consolidation, pointing out that the striations 

 enter the embayed portions and small indents in the stone in a 

 manner never produced by glacial or sliding movements. 



Mr. Irving also agreed in the last remarks. It was a subject to 

 which, he had himself drawn attention. Inclining to Mr. Blanford's 

 view as to the origin of the coal, he asked if the structure of the 

 ash did not suggest silicified vegetable tissue. 



Prof. Geeen said it was difficult to select the names for South- African 

 subdivisions, and he had been unable to determine exactly what Beau- 

 fort and Koonap Beds were. He had explained in the paper the 

 question of the xDresence of Kimberley Shales to the southward. He 

 had been unable to find out what the supposed Lepidodendra were. 

 In referring to the intrusive basalt, he had especially noted the small 

 disturbance of the overlying beds. The structure of the coal to 

 which Mr. Irving had referred did not appear to be organic. The 

 speaker further explained the origin of the Ecca Conglomerate by 

 gradual subsidence. 



Mr. SxiTH WooDWAED Said he had avoided calling the fish-remains 

 Triassic ; and considered that, if really Triassic, they must be very 

 high in the system. 



