GEOLOGY 73 



The programme of wide and rapid mapping in French West 

 Africa and the Belgian Congo has already been mentioned. The 

 series of 1 1500,000 sheets of the Belgian Congo will cover the whole 

 area in about fifty sheets, a number of which have already been 

 published. Each sheet is accompanied by a descriptive leaflet. 

 The detailed geological maps of the Katanga on 1:200,000 have 

 also been mentioned before. For the French territories and adjoin- 

 ing regions the atlas of the French colonies contains some of the 

 best co-ordinated geological maps (Grandidier 1933). 



PUBLICATIONS 



It is impossible to touch in a small space on the numerous other 

 results of the individual departments, but some idea of the available 

 literature may be given before passing on to a brief survey of the 

 known mineral resources and then to a discussion of geological 

 problems in relation to water. 



In the first place an industrious and brilliant German geologist 

 has succeeded in writing a systematic geology of the whole con- 

 tinent (Krenkel 1925-8). There are also several notable books on 

 the regional geology of big sections of the continent, especially 

 those by du Toit (1926) for South Africa, Gregory (1921) for East 

 Africa, with particular reference to the rift valleys, and Lemoine 

 (19 13) for West Africa. 



The British Geological Survey Departments publish summaries 

 of progress, usually in the form of annual reports, while the results 

 of special research work are generally published in bulletins, 

 occasional papers, etc. In Nigeria, in addition to the annual 

 reports, the results of research are published in bulletins, occa- 

 sional papers and pamphlets. Sixteen bulletins have appeared, 

 covering various subjects from tin-fields, coal-fields, and water- 

 supply, to eocene fish and mollusca. There are also six occasional 

 papers, including such subjects as coal, district geology, and 

 fossils. Of the pamphlets, only one is published. In addition, an 

 important report on the goldfields appeared in 1935 as a sessional 

 paper of the Legislative Council. These publications contain a 

 mass of important information, but the difficulty of following up 

 specific subjects tends to discourage experts from making use of 

 it. 



