List of plates; List of text-figures; Foreword; Preface; Part I. Introduction: 1. Physical geography; 2. The work of previous investigators; Part II. The General Geology of the Special Areas and Stratigraphy: 3. Introduction. Western British Somaliland and the Nogal Valley; 4. The Webi Shebeli and its tributaries; 5. The Danakil rift; 6. The north and east coasts; 7. Correlation of geological deposits, events and cultures within the Horn; Part II. The Prehistory of the Special Areas: 8. Terminology; 9. The Acheulio-Levalloisian culture; 10. The Somaliland Stillbay culture; 11. The Doian culture; 12. The Somaliland Wilton culture and its variants; 13. Prehistoric art in the Horn of Africa; Part IV. A Tentative Correlation of Cultures and Climates: 14. A tentative correlation of cultures and climates in the Horn with other areas of the African continent and with Southern Arabia; Appendix A. Details of collections (not previously described) made by civil and military personnel in the Somalilands and Abyssinia; Appendix B. Tool lists for additional Somaliland Magosian culture sites; Appendix C. Tool lists for additional Hargesian culture sites; Appendix D. Tool lists for additional Doian culture sites; Appendix E. Tool lists for additional Somaliland Wilton culture sites; Appendix F. Report on the faunal remains collected by J. D. Clark from sites in the Somalilands D. M. A. Bate; Appendix G. List of marine molluscs collected by J. D. Clark from raised beaches and other sites in the Somalilands L. R. Cox; Appendix H. List of charcoals collected by J. D. Clark from prehistoric sites in the Somalilands. By Royal Botanic Gardens, Kew; Bibliography; Maps; Index.