458 Annals of the South African Museum. 



etc.) which indicates that it is largely of windworn material. 



A section made from a rock kindly supplied by Mr. Macgregor 

 shows distinctly two sizes of grains - - a large rounded grain of dia- 

 meter about 05 ram., and a somewhat polygonal, smaller grain which 

 is also rounded, of about 0-1 mm. diameter. The latter make up the 

 bulk of the rock, which is from Esipongweni, about 20 miles N. of 

 Bulawayo and about 30 feet below the first basalt. The larger grains 

 are nearly all quartz. The smaller grains consist partly of fresh 

 felspar, mainly microcline. Some of the quartz grains show strain 

 shadows under crossed Nicols. There are occasional small grains of 

 apatite and what is possibly tourmaline. The appearance of the grains 

 is closely similar to those of the present-day Kalahari sand, save that 

 there is no ferruginous coating. 



Molyneux has pointed out that towards the top of the Forest 

 Sandstone the beds contain increasing quantities of coarser rounded 

 grains mixed with the others. As the Transition Sandstone is reached 

 the grains are still coarser and dark grey in colour and are all well 

 rounded, cohering together by oxide of iron. 



Apart from the fragmentary Dinosaurs mentioned, the only Storm- 

 berg fossils found in S. Rhodesia are plant remains which have re- 

 cently been discovered by Mr. Macgregor and have been sent to 

 Professor Seward for determination. I ain indebted to Mr. Macgregor 

 for a preliminary note on this occurrence (in litt.). He writes "I had 

 the fortune to obtain some fossils from the lower deposits (at Soma- 

 bula). There are forms resembling Thinnfeldia and Phyllotheca so I 

 take them to be Stormberg provisionally. I believe the whole deposit 

 except a surface implementiferous rubble to be Karroo, but there 

 are two types very distinct at Willoughby though interbedded at 

 other places. The older deposits are red and pink mudstones and 

 micaceous sandstones with white fossiliferous sandstones occurring as 

 lenticles. and gravel with very well rounded pebbles at the base. 

 The newer .deposits cut channels through the older sometimes into the 

 granite beneath. They are essentially coarse ill-consolidated arkoses 

 with inbedded gravels. The chief point is that the base of the deposits 

 resembles the base of the Forest Sandstone and the upper beds re- 

 semble the Escarpment Grits. There is nothing at all like the white 

 Forest Sandstone. The fossils were at the bottom". Macgregor cons- 

 iders the Escarpment Grits to be probably of the same age as the 

 Somabula gravels as they have the same highly rounded quartz and 

 quartzite pebbles. 



Finally, Molyneux has seen white sandstone with basalt on top 

 overlying Escarpment Grits in the Mafungabusi district, 60 mile N.N.W. 



