INTRODUCTION 



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edge marks the stage reached in the denudation of the 



latter from a gently 



sloping floor. That the 



Karroo formation once 



extended across the 



southern mountains is 



proved by its outliers 



amongst the moun- 

 tains and the large out- 

 lier on the downthrow 



side of the Worcester 



fault (Fig. 1), along 



which the various rock 



formations up to and 

 including the Ecca at 

 least have been let down 

 against the Malmes- 

 burybeds. The south- 

 ern limit of the Karroo 

 beds is unknown ; they 

 may have stretched be- 

 yond the present coast. 

 A very important 

 feature in the plateau 

 region is the abundance 

 of dolerite intrusions. 

 These intrusions avoid 

 the folded belt, but both 

 on the inland side and 

 in the narrow strip still 

 open to observation on 



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