376 HIGH-LEVEL GRAVEL-CAPPED TERRACES 



and quartzite terraces south of Botha's Hill and the 

 curious Sugar Loaf Hill nearer the town are parts of a 

 slightly undulating plain that has been cut into by the 

 Blaauw Krantz River. The underlying rocks belong to 

 the Witteberg and Dwyka series. 



In the country north-east of the G-ualana Kiver, where 

 the coast is formed by the Karroo formation, there are 

 extensive plateau-like terraces bordering the coast, 

 deeply cut into by the rivers flowing from the Stormberg 

 and Drakensberg. At a few spots on the plateau that 

 lies about 2,000 feet above the sea there are remains of 

 deposits analogous to the old alluvium and quartzites of 

 the country to the south-west. Kentani Hill is a con- 

 spicuous example of these. At the present time, how- 

 ever, little is known of the extent of these rocks. 



In the Western Karroo a fairly well-developed terrace 

 is visible along the foot of the Zwart Euggens, the dry 

 mountain ridge of Witteberg beds that limits the Ceres 

 and Tanqua Karroos. In the Tanqua Valley a corre- 

 sponding terrace covered with gravel derived from the 

 Klein Roggeveld forms a conspicuous feature on the 

 south side of the valley. 



In all these cases the gravels are coarser near the 

 mountains than farther away from them. Pebbles and 

 boulders derived from the Table Mountain sandstone are 

 by far the most conspicuous constituents in the high 

 level gravels of the southern coastal region and in those 

 of the country between the Langebergen and Zwarte- 

 bergen. The boulders are sometimes of great size, four 

 or five feet in diameter, and they have their edges 

 rounded off; the smaller fragments are more rounded 



