470 Transactions of the South African Philosophical Society. 



Demaret, L. " On the extension of the Main Eeef Eastwards, 

 beyond Vogelfontein, and on the Nature of the Eietfontein 

 Eeef." Trans. Geol. Soc. South Africa, vol. iii., 1897, pp. 

 143-144. 



Proves theoretically that the New Eietfontein Eeef may 



belong to the Main Eeef series. 



E. H. L. S. 



Stonestreet, S. D " Notes on the Black Eeef at Natal Spruit." 

 Trans. Geol. Soc. South Africa, vol. hi., 1897, pp. 53-55. 



South of the Black Eeef outcrop is a flat expanse of swampy 

 ground where the rocks are covered by thick surface deposits. 

 This country has now been explored by drilling. The Black 

 Eeef is deposited on a sheet of amygdaloidal igneous rock capping 

 the Elsburg series ; the igneous sheet is thrown into folds or 

 waves 300 feet to 400 feet from crest to crest, and from 50 feet 

 to 200 feet in height. In the troughs the payable ore is found ; 

 it is a conglomerate with small pebbles and angular fragments ; 

 it is richest in the lowest six inches, and below this is a 

 ferruginous clay carrying gold. The hanging wall is quartzite, 

 and above this is limestone. A dyke of syenite occurs in the 

 district. 



E. H. L. S. 



Wilson-Moore, C. " Some Observations on the Geology of the 

 Sabie Valley." Trans. Geol. Soc. South Africa, vol. iii., 1897, 

 pp. 131-140, with map and sections 



The Lydenburg beds are divided into the — (a) Upper Shales 

 and Sandstones ; (b) Dolomites ; (c) Lower Sandstones and 

 Conglomerates ; below these are tilted slates and granite. The 

 tilted slates often surround horizontal tracts of the lower 

 sandstones, as if the latter were deposited in hollows of the 

 former. These slates are the same as the Swazie schists, and 

 occur in belts running east and west ; they are occasionally 

 very little altered, but usually exhibit schistose structure. The 

 granite passes into them through gneiss. On the confines of 

 the Portuguese territory extensive coal deposits are found, and 

 Jurassic beds with fossils occur near by on the lower slopes of 

 the Sebombo ; the coal is laminated but rusty in colour. The 

 sandstones and shales bearing the coal rest directly upon 

 granite. 



E. H. L. S. 



