PRE-CAPE ROCKS OF SOUTH AND WEST OF COLONY 41 



doubt that the junction is an unconformable one. It 

 is very probable that the Table Mountain sandstone was 

 deposited upon the then nearly horizontal Cango beds, 

 which had suffered some denudation, so that the base of 

 the former group rested upon different horizons of the 

 latter series at different localities. During the great 

 earth-movements that produced the Zwartebergen the 

 two series were together folded and inverted, so that at 

 places the older beds appear to overlie the younger con- 

 formably. 



The Cango beds usually have high southerly dips, but 

 in the neighbourhood of Kruis River, west of the road 

 up the Zwartberg Pass, the strike is north-east. The 

 top or bottom of a fold is occasionally seen ; this in- 

 dicates that the series is thrown into isoclinal folds, and 

 that the observed great thickness of southerly dipping 

 beds is really due to the repeated folding of a much 

 smaller thickness of rocks. The true succession of the 

 members of the series is rather uncertain, and the base 

 has not been found. 



The series consists of conglomerates, quartz-felspar 

 grits, quartzites, slates and limestones, in all a very 

 considerable thickness of rock, not under 10,000 feet. 

 These are accompanied by intrusive rocks of the nature 

 of diabase or altered dolerite (see Fig. 5). The con- 

 glomerates lie next to the Table Mountain sandstone 

 in the western part of the area ; in the central portion, 

 the limestone lies in a similar position, elsewhere slates 

 or quartzites are in contact with the sandstone. At 

 the Gamka Poort thick bands of conglomerate are in 

 contact with the Table Mountain series. There are 



