456 



Annals of the South African Museum. 



bun-coloured sandstone lies unconformably on a floor of granite and 

 greenstone schists. 



The latest paper by Molyneux (1015)) described the succession in 

 the Pasipas area X. of Bulawayo. He divides the sediments as 

 follows : 



Nyamandhlovu 



Arid climate . 





Basalt 



Sandstone . 



30 ft. 

 15 ft. 



Forest 

 Sandstone 



Basalt 30-100 ft. 



Lava flows and 



Aeolian sands . Transition sandstone 40 ft. 

 Upper division . Fine, pulverulent 



sandstone, interst- 

 itial clay. . . . 70 ft. 

 Marls and sandstones 30 ft. 

 Fine calcareous sand- 

 stone with calcrete. 

 Limestone . . . 110 ft. 

 Partially sorted ar- 



kose 10 ft. 



Middle division 

 Lower division 



Basal beds . 



In petrological features, the Escarpment Grits consist throughout of 

 a "coarse grey grit, containing banks of pebbles, which are often as 

 large as eggs. It is not bedded very regularly, false bedding being 

 common, and the rock usually breaks along a pebbly bed. The pebbles 

 are all well rounded, and are mostly of quartz, but granite and gneiss 

 pebbles occur occasionally. The rock is well jointed, and the joint 

 faces are usually coated with a dark brown ferruginous skin."(Lightfoot) 



The Forest Sandstone of the typical area shows the following 

 features. The Basal Beds are conglomerates containing a large per- 

 centage of calcium carbonate, and are typically white in colour. 

 Besides containing derived pebbles, siliceous concretions are very 

 plentiful. The under surface of the beds is very irregular and in 

 places the hollows are filled with a line red marly sandstone lying 

 beneath the conglomerates. In a specimen kindly sent me by 

 Mr. Macgregor a small piece of bone was detected. This is the only 

 fossil so far recorded from this conglomerate. The Bed Marls have 

 a maximum thickness of 4 feet. They are pinkish red to chocolate 

 brown in colour, laminated, and very friable. Hitherto they have not 

 been found to contain fossils. The White Sandstone follows the Red 

 Mtirls. It is a massive white rock composed of angular grains of sand 

 cemented in an opaline matrix. No bedding planes occur except just 



