108 THE KORANNABERGEN 



are certainly repeated along any one section. On the 

 west side there are nearly isoclinal folds* with their axial 

 planes inclined eastwards, but the general dip in the 

 main range, as in the foothills on each side, is towards 

 the west. 



The Matsap series forms several ranges in the south- 

 eastern corner of the Kalahari ; the chief of them are 

 the Inkruip, Karreeboom Laagte hills, the Kamkuip, the 

 western hills of the Schuurberg, the Sagoup Kange 

 which is on the strike of the Korannaberg, and several 

 small hills west of Sagoup. The rocks in these localities 

 are like those of the Lower and Upper Matsap groups, but 

 generally with a greater development of cleavage, owing 

 to their containing more material favourable to the pro- 

 duction of sericite, a characteristic mineral in rocks 

 that contain clayey or felspathic material and have been 

 subjected to great pressure during crustal movements. 



A wide stretch of sand hides the rocks for a long dis- 

 tance north of theKorannabergen and the mountains in 

 the Kalahari, but between Kolingkwane and Kuis on 

 the Molopo steeply dipping purple quartzites which 

 must belong to the Matsap beds crop out in the valley. 

 They are unconformably overlain by the Dwyka series. 



The mountains made of the Matsap rocks are very 

 stony and have little soil on them. In this they resemble 

 the ranges made of the Table Mountain sandstone of the 

 south and west. There is, however, a great difference 

 in the general appearance of the two groups of mountains 

 due partly to lithological differences and partly to the 

 contrast in climate of the two regions. The purplish 



