184 Revieivs — Geologi/ of the Transvaal. 



Karroo System. 



„ , . c. . f Lebombo rhyolites. 

 Volcanic Series } ^^^^..^^^ amygdaloids. 



Bushveld Sandstone Series. 



Coal-mcasiire Series. 



Glacial Conglomerate and Shales. 



(Unconformity.) 



"Waterberg System. 



Waterherg Sandstones and Conglomerates. 

 Felsitic lavas, agglomerates, and shales. 



(Unconformity.) 

 Transvaal System. 

 Pretoria Series. 

 Dolomite. 

 Black Reef Series. 



(Unconformity.) 



Ventersdorp System. 



Boulder Beds, Klipriversberg and Vaal River Amygdaloids. 

 Elsburg Series. 



(Unconformity.) 



Witwatersrand System. 



Upper Witivatersrand Series. 

 Lower Witwatersrand Series. 



(Unconformity.) 



Moodies Series. 

 Crystalline Series. 



Between, the ancient crystalline series and the Karroo System there 

 are therefore interposed four unconformable, wholly unfossiliferous 

 systems, consisting of limestones, shales, sandstones, and volcanic 

 rocks. 



Limitation of space prevents even a mention of the outlines of the 

 many interesting geological features of the districts in which this 

 complicated succession has been so carefully worked out and so clearly 

 described by Mr. Herbert Kynaston (the Director) and by Messrs. 

 Mellor, Hall, Humphrey, and Steart. The readers interested in 

 economic questions rightly receive due attention ; while those with 

 a predilection towards physiographical studies are pi-ovided with 

 photographs, diagrams, and descriptions of the interesting drainage 

 systems of the Mathlapitsi, Olifants, and Letaba Rivers. 



Both Reports, indeed, are albums of excellent photographs of 

 rock scenery, rock-sections, and minerals. The accompanying 

 colour- printed maps are likewise excellent, though it is unfortunate 

 that the colour adopted for the KaiToo System should be wholly 

 distinct from that of the published maps of the Cape Geological 

 Commission. 



In a new country it is a good sign that the educational value of 

 a geological collection is not lost sight of, and that the museum at 

 Pretoria, under the curatorship of Mr. Tweddill and his assistant, 

 Mr. Gardthausen, continues to receive valuable additions. W. G. 



