10 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [NoV. 8, 



Those at the former locality are smooth and polished, and, where 

 exposed to the action of tlie weather, black on the outer surface ; 

 but where covered, of a reddish hue. They are close, hard, and 

 compact, with a felspathic (?) character. At another spot, a section 

 of them is given as follows (fig. 3) : — 



Fig. 3. — Section of Supposed Metamorpliic Roclcs on the 

 Vaal liiver. 



1. Whitish quartz. 



2. Quartzose rock. 



3. Eock similar to b in the lai-ge section (fig. 2). 



It appears highly probable that at one time these rocks from 6 

 to h (see the Section, fig. 2) have been eroded into a wide trough, in 

 which the more recent gravels, e, /, and g, have been laid down. 

 These gravels are evidently of a more recent origin than those at the 

 higher levels, and are most probablj^ composed of materials from 

 the older gravels. The gravel and boulders are intermingled in the 

 most confused manner ; and the several bands have irregular lines 

 of bedding, and are rather contorted, appearing diff'erent from what 

 might have been expected if laid down simply by fluvial action. 

 This deposit was at one time very extensive in this locality, stretching 

 across the present course of the river, and for a considerable distance 

 along the bank of the Hebron side (see Map, PL I.). The stream, be- 

 fore it cut the new channel through these gravels, must have occupied 

 an ancient river-bed, which, like the one at Cawood's Hope (p. 6), 

 is now left dry, and traversed by flowing water only at the time of 

 a very high flood. 



Du Toifs Pan. — With regard to Du Toit's Pan, which is rapidly 

 becoming the chief centre of attraction to the diggers, I have not 

 been able to obtain a trustworthy section, nor sufiicient data to 

 form a decided opinion uj)on the diamantiferous deposits in that 



sive sections 1 have lately made, it crops up through them ; or, rather, the de- 

 nudation has been so great in several places tliat it is exposed. This seems to 

 be corroborated by information given to me a few days ago by Mr. H. Southey, 

 who says that in the district of Middleberg, near the Ehenosterberg, there is a 

 strip of country, stretching from the Orange River, with "pans " of exactly the 

 same character as those between the Modder and Vaal, and that at two of them 

 (Groote Fontein and Klip Riff, between Middleberg and Craddock) numerous 

 garnets have been picked up which seemed to liim to be similar to those from 

 Du Toit's Pan.— G-. W. S., July 6, 1871. 



