Observation on the Geology of Northern Central Africa

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Abstract
The object of this lecture is to sketch the geological history of a remote continental region, much of which remains to be surveyed, between the Belgian Congo and Cyrenaica, the Nile and the French Sahara and Soudan. Only incidental reference is made to Egypt, East and South Africa, and territories where British official surveys are established. An effort is also made to review recent Belgian, French, and Italian work in this region. I am especially indebted to Mr. H. B. Maufe, who read the text and gave much valuable advice, to M. Blondel, Director of the Bureau d'Études géologiques et Minières coloniales, Paris, and to M. T. Monod, of the Muséum d'histoire naturelle, Paris, for their unstinted help. My thanks are due also to M. R. Perret for the photograph reproduced as Plate XXXII, to MM. Perret and J. Bourcart for permission to reproduce Figure 2, and to my wife for the photograph of Plate XXXIII and for much help in preparing the text and bibliography. This attempt to visualize the geology of the region as a whole is based on my field work in the critical central area. The whole of the well-known and broad coastal and marginal lands are omitted from consideration : they can be studied in official publications and in the works of Krenkel (1925–34) and other authors. Reference is made also to the Congo basin-Zambesi watershed. These rocks may be divided into an Archaean basement complex and a series of altered, often highly folded, sediments

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