ON SOUTH AFRICAN STRATA 



139 



The Waterberg System. 



According to the detailed work of Mr. Mellor in the Middelburg 

 district this system may be subdivided as follows: — 



Upper 

 Lower 



Sandstone and quartzite series 

 Shale and sandstone series . 

 Volcanic series, with interbedded 

 shales and sandstones 



N. Cape Colony 

 Upper Matsap beds. 



Probably Middle (volcanic) 

 and Lower Matsap. 



The Sijarira and Umkondo series of Rhodesia may very probably be 

 the equivalent of the Waterberg System. 



Karroo System. 



With regard to the classification of this system, we consider that 

 that of Cape Colony should be followed as far as possible, as it is there 

 that the system has its maximum development; also it is important to 

 distinguish clearly between the glacial and non-glacial beds, between 

 which there is apparently in the Transvaal a slight unconformity. We 

 also approve of the proposal of the Cape Colony members of the Com- 

 mittee to abandon ths term Ecca and extend that of Beaufort to 

 include the Ecca. The term Dwyka, however, should be retained to 

 include the beds of glacial origin at the base oE the system. 



The following table represents the Karroo System as developed in 

 the Transvaal, with the probable Cape Colony and Ehodesian equiva- 

 lents : — - 



Karroo System. 



Volcanic series 



Bush veld sand- 

 stone scries 



' Lebombo rhyolites 

 Bush veld ainygda- 

 loids 



Fine red and yellow 



sandstones 

 Sandy marls and 



shales 



Coal-measure series 



(Slight unconformity) , 



Glacial conglomerates and shales 

 (Dwyka) 



(absent) 

 Volcanic group ^ 



Cave sandstone 

 Bed beds 



Molteno beds ? 

 Beaufort serks 



Ecca (practi- 

 cally absent 

 in Transvaal), 



Dwyka series 



Tuli amygdaloid and 

 Batoka basalts. 



' Forest sandstones, 

 Samkoto series and 

 Klaballa sandstones 

 of Bechuanaland 

 Protectorate. 



Coal-measure series 

 (including escarp- 

 ment grits, Matobola 

 and Busse beds). 



Glacial conglomerates. 



Report by Mr. P. P. Menkell. 



lie the South African Correlation Committee, I beg to submit the 

 following notes, suggestions, and criticisms on Professor Gregory's draft 

 report : — 



