128 DE. F. OSWALD ON THE [June I914* 



7. The Miocene Beds of the Victoria Nyanza and the Geology 

 of the Countey between the Lake and the Kisn Highlands. 

 By Felix Oswald, D.Sc, B.A., F.G.S. With an Appendix 

 on the Yertebeate Remains, hy Chaeles William 

 Andeews, D.Sc, F.R.S., F.G-.S. ; and an Appendix on the 

 Non-Maeine Molliisca, by Richaed Bullen Newton, 

 F.G-.S. (Read June 25th, 1913.) 



[Plates XX-XXX.] 



Contents. 



Page 

 I. Introduction 128 



II. Description of the Miocene Series 129 



III. Distribution of the Miocene Series 135 



IV. Basement-Floor of the Miocene Series 138 



V. The Basalt Plateau of Gwasi 140 



VI. Geology of the Country between the Victoria Nyanza 



and the Kisii Highlands (with Bock-descriptions) . 144 



Appendix 1 159 



Appendix II (C. W. A.) 163 



Appendix III (B. B. N.) 187 



I. Inteodlction. 



In the winter o£ 1911 1 undertook a journey to the Victoria Nyanza 

 on behalf of the British Museum, in order to investigate some beds 

 of Miocene age, discovered in 1909 by Mr. Gr. R. Chesnaye while 

 prospecting near Karungu on the eastern coast of the lake. He 

 discovered fragments of bones and of Chelonian carapaces in 

 low cliffs capped with basalt, situated a few miles to the south- 

 east of Karungu. Mr. C. W. Hobley, C.M.G., H.M. Provincial 

 Commissioner, who has made important researches in the natural 

 history and anthropology of British East Africa, immediately 

 realized the significance and importance of the discovery, and 

 induced the late Mr. D. B. Pigott, a Government official, to under- 

 take a search for further specimens. As the result of his efforts, 

 he forwarded to Mr. Hobley a portion of the left ramus of the 

 mandible, some teeth, and the patella and calcaneum of a Dinothe- 

 rinm, together with fragmentary remains indicating the presence 

 of a small Rhinoceros (Aceratherium), Trionyx, Testudo, and 

 some Crocodilian remains. 



Mr. Hobley presented these fossils to the British Museum, and 

 Dr. C. W. Andrews, F.R.S., described and figured the remains of 

 the Dinotherium, which he named D. hoblei/i, in the Proceedings 

 of the Zoological Society for 1911 (pp. 943-45 & pi. xlviii), 



