GEOLOGY yi 



tions of the large public works departments; these functioned 

 from about 1 921 -31, when the personnel was much reduced on 

 account of budget difficulties in the depression. The area adminis- 

 tered by the Mozambique Company has its own mining and geo- 

 logical section, and a geologist is permanently attached to the 

 staff of the geographical mission in the Tete District, mentioned 

 in Chapter II. Geologists attached to the Portuguese colonies 

 spend four or five months of each year, during the African rainy 

 season, in Europe, for the purpose of working up the results of field 

 work. Portuguese Guinea and St. Tome have no geological depart- 

 ment, but work has been carried out there by special missions. 



INTERNATIONAL 



For purposes of international co-operation in geological studies 

 throughout the world, congresses are held from time to time. That 

 of 1929 in South Africa was the occasion for international discus- 

 sion of many subjects bearing on the African continent, and the 

 published volumes (Congress 1930) include many valuable con- 

 tributions, the sections devoted to pre-pleistocene glacial periods, 

 the Karroo and rift valleys, being of leading importance. The 

 Internationaler Geologen und Mineralogen Kalender (193 7-) contains 

 amongst other useful information, a list of the geologists who are 

 now engaged in study in all parts of Africa. 



RESULTS 



MAPPING 



It has been recognized for many years that a geological map of 

 the whole of Africa on a uniform scale was urgently required for 

 general reference purposes, and all territorial maps were sent to 

 the late Dr. J. W. Evans to be incorporated. Little came of the 

 project, however, until the International Geological Congress in 

 South Africa in 1929, when the preparation of an international 

 map was put in hand. M. Emmanuel de Margerie was appointed 

 general secretary of the Special Commission for this purpose, and 

 M. Blondel accepted the responsibility for most of the work en- 

 tailed. A list of all existing maps from which the international map 

 will be compiled has now been prepared, together with an index 



