OQ 



ME. R. H. HASTALL ON THE GEOLOGY OE [Nov. I9II, 



since it is obviously so different from all the other occurrences 

 in the neighbourhood. I paid especial attention to this point in 

 the exposures of Enon Conglomerate near Robertson and Ashton, 

 and was unable, after several prolonged searches, to find a single 

 piece of Malraesbury slate. 



But a further point may also be put forward : the coarse grits and 

 quaitzites of the lower part of the Table Mountain Series could not 

 be identified with certainty in the Enon Conglomerate. It appeared 

 to me, and to the local observers who were kind enough to assist 

 me, that all the blocks in the Enon Conglomerate could be referred 

 to the Witteberg and Ecca Series (including, of course, in this last 

 designation the Dwyka Conglomerate). This is an argument which 

 must not be pushed too far, since it is obviously impossible to state 

 dogmatically that every pebble of quartzite or of sandstone is Witte- 

 berg or Ecca Sandstone and not Table Mountain Sandstone. Still, 

 it may be safely asserted that the general facies of the pebbles in 

 the Enon Conglomerate led to the belief that the Table Mountain 

 Sandstone is not represented therein. 



If these facts are admitted, we are at once led to an important 

 conclusion, namely: that at the time of the formation of 

 the Enon Conglomerate the Malmesbury Series and 

 the lower part of the Cape System were not exposed in 

 the district here investigated. 



In order to appreciate the full significance of this conclusion, we 

 must now consider what were the conditions under which the Enon 

 Conglomerate was formed. It is obviously a torrential deposit, 

 composed of well-rounded blocks, embedded in a sandy matrix, 

 with occasionally, and especially in the higher part of the succession, 

 beds of a finer texture and sandy or marly character. This deposit 

 has evidently been formed under terrestrial conditions, and it is very 

 similar to the deposits now being formed, or which have recently 

 been formed, at the foot of the mountain -slopes of the region, and 

 especially where the larger streams cut through the ranges. 

 Reference has already been made to the difficulty of distinguishing 

 between weathered Enon Conglomerate and some of these recent 

 deposits, and their manner of formation must have been very similar. 

 "When bedding is visible in the Enon Series, it is often evident that 

 the material came from the north, showing that at that time also the 

 high ground lay in that direction. 



However, it appears improbable, from two independent lines of 

 argument, that the Enon Conglomerate was formed in exactly its 

 present position. In the first place, it has been shown that the 

 Enon Conglomerate has taken part in some, at any rate, of the move- 

 ment of the Worcester Fault, hence it must have been formed at 

 a higher level : and secondly, the materials of the conglomerate are 

 not of a character consistent with formation at the present level. 



It may be suggested, then, that at the time of the formation of 

 the Enon Conglomerate a range of mountains existed in approxi- 

 mately the same geographical position as the Langebergen, but at a 

 higher level, so that it was composed of Witteberg and Karroo 



