162 ME. G. W. LAMPLTJGH ON THE [^lay I907, 



12. The Geology of the Zambezi Basin around the Batoka Goege 

 (Rhodesia). By Geoege William Lampltjgh, F.R.S., F.G.S. 

 With Peteogeaphical Notes by Heebeet Hexey Thomas, M. A., 

 B.Sc, F.G.S. (Read January 23rd, 1907.) 



[Plates X-XVIL] 



Contents. 



Page 



I. Introduction 162 



II. Previous Literature 163 



III. Physical Features 165 



IV. Geological Structure 171 



(1 ) The Fundamental Complex 171 



(2) TheWankie Sandstones and Coal-measures. 173 



(3) The Batoka Basalts 182 



(4) The Flaggy Sandstone of Boomka, etc. ... 196 



(5) The Superficial Deposits 198 



V. Summary and Conclusion 206 



Appendix I. Petrographical Notes, by H. H. Thomas 207 



II. Local Notes on the Batoka Basalts 212 



III. Local Notes on the Superficial Deposits 213 



I. Inteoltjction. 



At the request of the Council of the British Association, I undertook 

 to examine the country in the neighbourhood of the Victoria Falls 

 of the Zambezi l River before the meeting of the Association in South 

 Africa in the summer of 1905. Through the helpful co-operation 

 of the British South Africa Company and the aid afforded to me by 

 its officers in Rhodesia, I was enabled to make good use of the short 

 time available to me for the task ; and by rapid traverses of the 

 wild country eastward of the Falls I gleaned much information 

 regarding the geology and physiography of this little-known region. 

 A preliminary account of the exploration was presented at the 

 meeting of the British Association in Johannesburg, and has since 

 been published in the ; Report ' of that body. 2 In this account 

 the objects of the exploration and the circumstances of the journey 

 are stated, and therefore need not be repeated here ; but of the 

 geological results it was only possible at that time to give a bare 

 outline, pending the further examination of the material collected. 

 My present object is to deal more adequately with the geological 

 evidence. 



The traverses occupied seven weeks in July and August, 1905, 

 during which time a distance of over 600 miles was covered, partly 

 on the northern and partly on the southern side of the Zambezi, as 

 shown on the sketch-map (PI. XVII), the area embraced within 



1 This spelling is adopted to conform with the usage of the Royal Geogra- 

 phical Society, although personally I think that Livingstone's spelling Zambesi 

 should have been retained. 



2 Rep. Brit. Assoc. 1905 (South Africa) [London, 1906] pp. 292-301. 



