ABSTRACT
SESSION I: JULY 10 (3:OO-6:45 P.M.) This session took the form of a general outline of Africa as a whole and by
special regions, from the point of view of physical features and basic ecology.
COOKE began with a factual, geological outline of the whole continent stressing the importance of basins of sedimentation and, in Late Tertiary and Pleistocene times, of sediment traps formed by the Rift Valley system. Emphasis was laid on the fact that the effects of temperature and rainfall on vegetation can be considerably modified b!. basic geology, physical features, and the nature of the soil.
