128 GEOLOGY OF THE NEIGHBOURHOOD OF STELLKNBOSCH. 



which crossed the backward prolongation of its course (see 

 Figs. 2, 3. 4). It then developed a "subsequent" tributary 

 along this line of least resistance, which, cutting down rapidly, 

 in the course of time gouged out Jonker's Hoek. Strictly speak- 

 ing, therefore, the stream which comes out of Jonker's Hoek is 

 a tributary of the older stream, whose true headwaters arise on 

 Hels Hoogte. Owing to more favourable geological conditions, 

 however, the subsequent has acquired greater importance than 

 the headwaters of the consequent. Seen from this new point of 

 view, the apparently eccentric behaviour of what we call Eerste 

 River is explained : the middle and lower portions ha\e roughly 

 their proper consequent direction, but the upper third has 

 developed from a subsequent, and therefore meets the main 

 trunk at a high angle. 



■J- 



Fig. 3- 



The eastward bend of Eerste River just before it flows into 

 False Bay is a much younger development than the above : it has 

 been produced by the building of a bar or storm beach across 

 the mouth of the stream, which was therefore compelled to seek 

 a new outlet. 



From consideration of the Eerste River System, we may 

 turn now to that of its principal deposit. 



The Alluvium of Eerste River. 



This deposit, which forms the flat floor of the Stellenbosch 

 Valley, consists of boulders, sand and silt with a distinct strati- 

 fication. Good sections of the deposit may be seen in the banks 

 of Eerste River itself, just below The Home; also among the 

 sand pits at the east end of the golf course, ami in the banks 

 of Kromme River in front of Mr. Garlick's farm, Glenelly. 

 The total thickness of the deposit does not seem to have been 

 proved anywhere, which is surprising in view of the activity of 



