408 MR. W. GIBSON ON THE GEOLOGY OF THE GOLD-BEARING 



WvLEY, A., Eeport on the Copper Districts of Namaqualand. 1856. 



, Report on the Neighbourhood of iSmithfield. 1856. 



, Report on the Central Districts of the Colony. 1859. 



Of published information bearing directly upon the geology of 

 the area here dealt with the writer has been able to discover but 

 little. The following publications, however, should be noticed, 

 though the present paper was all but completed before Mr. Penning's 

 ' Contribution,' mentioned below, was read at one of the Geological 

 Society's meetings : — 



Alford, C. J., ' Geological Features of the Transvaal, South Africa.' London, 



1891. 

 , ' Geological Features of the De Kaap Gold-fields,' Mining Journal, April 



1889, pp. 453, 475. 

 , ' Witwatersrand Gold-fields : their Geological Features,' Mining Journal, 



October 5th, 1889. 

 , ' Geology of the Witwatersrand District,' Witwatersrand Min. & Metal- 



lurg. Review, 1890, p. 1. 

 Baines, Thomas, ' The Gold Regions of South-eastern Africa.' London, 1877. 

 Dahms, p., ' Ueber einige Eruptivgesteine aus Transvaal in Siid-Afrika,' Neues 



Jahrb. f. Min. (fee, Beilage-Band vii. (1890) p. 90. 

 De Launay, — , ' Les Mines d'Or du Transvaal,' Ann. des Mines, ser. 8, vol. xix. 



1891, p. 102. 

 DoRSEY, E. B., ' On the Witwatersrand Goldfields,' Report Brit. Assoc, for 



1889 (Newcastle Meeting), p. 592. 

 LiDDELL, J. M., ' The Gold-fields of the Valley of De Xaap, Transvaal, South 



Africa,' Trans. N. Eng. Inst. Min. & Mech. Eng. vol. xxxviii. (1889) 



p. 171. 

 Penning, W. H., 'The Goldfields of Lydenburg and DeKaap in the Transvaal,' 



Quart. Joarn. Geol. Soc. vol. xii. (1885) p. 569. 

 , ' The Transvaal Goldfields; their Past, Present, and Future,' Journ. Soc. 



Arts, vol. xxxii. (1884) p. 608. 

 , 'The South African Goldfields,' 'Journ. Soc. Arts, vol. xxxvi. (1888) 



p. 433. 

 , ' A Contribution to the Geology of the Southern Transvaal,' Quart. 



Journ. Geol. Soc. vol. xlvii. (1891) p. 451. 

 Rathbone, E. p., ' Report on the Coal-Mining Industry of the Transvaal, 



South Africa,' 1889. 

 Sawyer, A. R., ' Report on Coal-Mining in South Africa,' Trans. N. Staffs. Inst. 



Min. & Mech. Eng. vol. x. (1890). 

 , ' The Witwatersrand Goldfield — Mining at Johannesburg,' ibid. 1889. 



