60 



Annals of the South African Museum. 



the Vaal River very probably flowed in former times, C then being 

 an island. 



" Traces of still older gravels are found on the tops of the ridges C 

 and D about 100 feet higher up ; but to the north this upper terrace 

 is continuous and well developed, but does not appear to carry any 

 large implements. The gravels at Eiverton (west bank) and Warren- 

 ton seem similarly to be without implements. 



BARKLY 



Fig. 6. 



" This middle terrace at Barkly, which therefore corresponds to the 

 ' upper ' of the two authors quoted, carries many rolled implements, 

 and at the point marked A they have been brought up in thousands 

 in the course of sinking shafts to reach the diamond-bearing gravel. 

 Among the inclusions of diabase, some only slightly rolled others 

 very well rounded, are numerous large, well-shaped implements 

 considerably water- worn, their abundance at this one spot being 

 most remarkable. 



" It seems most likely that the implements were manufactured on 

 the slopes of the little hill C, and that they gravitated down into the 

 river at A. At the time when this terrace was being formed there 

 would probably be an eddy at A where the two branches of the river 

 reunited, and this might account for their extremely rolled condition 

 and possibly for their concentration at this point." 



The Ghiqual.\nd West Jasper Implements, and the Tyumi River Deposit. 



The Griqualand brown, yellow, or whitish jasper implements 

 have a certain aspect of their own, perhaps due to the material 



