98 Dr. F. H. Hatch — Geological Histor// of South Africa. 



the Black Eeef Series (Unconformity No. Ill), that below the 

 Ventersdorp System (Unconformity No. II), and that below the 

 Witwatersrand System (Unconformity No, I). In regard to Un- 

 conformity No. V, we have the exception that in Southern Cape 

 Colony the Table Mountain Sandstone, which some of us regard 

 as the representative of the Waterberg Sandstone, is followed 

 successively and in strict conformity by the Bokkeveld, the 

 Witteberg, and the lower shales of the Dwyka Series. 



The following order of superposition of the South African 

 stratified rocks may be regarded as now fairly established : — 



European 

 Equivalents. 



Southern- 

 Cape COLOXY. 



Transvaal. 



EniETic. 



Permo- 

 Carboni- 



FEROUS. 



Karroo 

 ■ System. ' 



Stormberg 



Beaufort 

 ,Ecca and Dwyka 



l' Volcanic Group. 

 I Cave Sandstone. 

 I Red Beds. 

 [ Molteno Beds. 



Devonian. 



Cane f^^itteberg 



System i ^^^^^^'^^^ 



^ ' [Table Mountain Sandstone 



Missing. 



Missing. 



Ecca and Dwyka. 



Missing. 

 Missing. 

 Waterberff Sandstone. 



(No. V.) 



(No. IV.) 



Arch.;ean. Malmesbury Series 



^ Potchef- ( Pretoria Beds, 

 stroom I Dolomite Series. 

 System. ( Black Eeef Series. 



(No. III.) 



! Boulder Beds, Volcanic 

 Breccias, Ivliprivers- 

 berg Amygdaloid, etc. 

 Elsburg Conglomerates. 

 (No. II.) 

 ■ro-x X / Upper "Witwatersrand 

 \^\ ' \ Beds. 



o '^'i*^ j Lower "Witwatersrand 



System. ( jj^^^^ 



(No. I.) 

 = Swaziland System. 



Venters- 

 dorp 

 System. 



With the exception of one or two points, which I shall proceed 

 to deal with, the above succession has found general acceptance. 

 One of the points about which there is some considerable difference 

 of opinion is as to how much or how little of the Karroo System 

 above the Dwyka Conglomerate is repi'esented in the Transvaal, 

 The view originally put forward was that the coal-bearing beds 

 of the Transvaal were a continuation of the Stormberg Beds of the 

 Cape. This was adopted by Molengraaff in his first geological 

 reports ; but later, in the course of a discussion as to the age of the 

 coal beds which took place in the Society some two years ago, he 

 came to the conclusion that our coal beds corresponded to the 

 Beaufort Beds.' Since then the conviction has grown amongst 



1 Molengraaff, Discussion on Dr. Corstorphine's paper "The Age of the Central 

 South African Coalfield" : Trans. Geol. Soc. S. Afr., vol. vi (IDO'S), p. 45. 



