444 DATE OF THE FOLDING 



Worcester, but with it before us we can believe that a 

 similar amount of rock was removed from the Pre-Cape 

 areas of Mossel Bay and the Cango, which are now 

 partly overlain by the Uitenhage conglomerates. It 

 must not be forgotten, however, that the Worcester 

 conglomerates may be somewhat later in age than the 

 similar rocks at Enon and Uitenhage, but the difference 

 is certainly small. 



When describing the dolerite intrusions of the Karroo 

 w r e noticed that they seem to have avoided the folded 

 belt ; they occur to the north of it and on its extreme 

 limits, where the intensity of folding is much less than 

 in the major portion of the belt ; we noticed also that 

 this peculiarity in the distribution of the dolerite pointed 

 to the folds having been in existence or in progress 

 when the dolerite was intruded. Now the dolerite is 

 probably of late Stormberg age, for the points of resem- 

 blance to the dolerites which are found in the volcanic 

 beds are so numerous, and at the same time of more 

 importance than the differences between them, that it 

 seems that both the general mass of dolerites in the 

 central and eastern parts of the Colony and the dis- 

 tinctly volcanic rocks belong to one series and reached 

 their present position at about the same time, the end 

 of the Stormberg period. The only other direct evi- 

 dence of the age of the dolerites at present known is 

 the occurrence of the rock as boulders in the Embotyi 

 conglomerates, which we must regard as of Cretaceous 

 age but probably younger than the Uitenhage beds. 

 This fixes a later limit to the age of the intrusions. If 

 the Embotyi beds should eventually prove to be of 



