406 ME. W. GIBSON OX THE GEOLOGY OP THE GOLD-BEARIXG 



especially in inspecting many of the mines, of studying somewhat 

 thoroughly the nature and the local sequence of the beds and the 

 amount of movement and alteration they have undergone. With 

 respect to other districts the information of the writer is more 

 general, being founded largely upon occasional observations and 

 sometimes upon facts gained in hasty traverses. The sections across 

 these more distant portions are therefore to be viewed as broad 

 generalizations, to which future observation will certainly add much 

 in the way of detail. 



(2) Summary of previous Geological WorTc hearing on the District. 



Our knowledge of the geology of most of South Africa, and more 

 particularly of the Southern Transvaal, is still of an imperfect 

 character. 



The collective results of the researches of the large number of 

 geological workers in South African areas outside the Transvaal 

 proper have, of course, proved more or less helpful towards a general 

 understanding of the relationship of the beds of the Transvaal area 

 to those of other districts. In this respect Prof. Green's recognition 

 of an unconformity between the Dwyka-Ecca Beds and the overlying 

 Kimberley Shales appears to the author to be especially important, 

 and will probably be found of wide application in South Africa. 

 The fact also that palaeontological evidence has shown the Karoo 

 and Uitenhage Beds to be homotaxial with the Lower Mesozoic and 

 Cretaceous formations of other countries is another factor of the 

 highest value in the correlation of the South African strata. 



The following list of papers on South African geology, though in- 

 complete, may be of service to other workers : — 



Bain, A. G., 'On the Geology of Southern Africa,' Trans. Gaol. Soe. London, 



2 ser. vol. vii. (1852) p. 175. 

 Blanford, H. F., ' On the Age and Correlations of the Plant-bearing Series of 



India, and the former Existence of an Indo-oceanic Continent,' Quart. 



Journ. Geol. Soc. vol xxxi. (1875) p. 519. 

 Blencowe, Eev. G., 'On certain Geological Facts witnessed in Natal and the 



Border Countries,' Quart. Joui-n. Geol. Soc. vol. xxxvi. (1880) p. 426. 

 Chaper, Maurice, F. Fouque, et A. Michel Levy, ' La Region Diamantifere 



de I'Afrique Australe,' 1880. 

 Dunn, E. J., ' On the Mode of Occurrence of Diamonds in South Africa,' 



Quart. Journ. Geol. Soc. vol. xxx. (1874) p. 54. 



, Report on the Stormberg Coalfields. Cape Town, 1878. 



, Report on a supposed extensive Deposit of Coal underlying the Central 



Districts of the Colony. Cape Town, 1886. 



, Geological Sketch-Map of South Africa. 2nd ed. 1887. 



, ' Further Notes on the Diamond Fields, &c. of South Africa,' Quart. 



Journ. Geol. Soc. vol. xxxiii. (1877) p. 879. 

 , Report on the Gold-prospecting Expedition of 1872, and on the Storm- 

 berg Coalfield. 1873. 



, Report on the Camdeboo and Nieuw veldt Coal. 1879. 



, ' Mode of Occurrence of Gold in the Transvaal Goldfield,' Geol. Mag. for 



1885, p. 171. 

 Galloway, W., ' Report on the Coal deposits of Indwe and Stormberg,' 1889. 

 , ' The South-African Coalfield,' Proc. South-Wales Institute of Engineers, 



vol. xvii. (1890) p. 67. 





