Geology of the Zambezi Basin. 651 



3. ' The Crystalline Ptocks of the Kukuruku Hills (Central 

 Province of Southern Nigeria). 5 By John Parkinson, B.A., F.G.S. 



In this paper a short account is given of the crystalline rocks 

 found in the Central Province of Southern Nigeria, between the 

 Station of Ifon (north of Benin City) and the Northern Nigerian 

 frontier. The rocks fall under two heads : (a) a group of gneisses, 

 and (6) a group of schists. 



The former is considered as intrusive in the latter, and consists 

 of varieties of biotite-gneisses, often well-banded, but this group is 

 not infrequently represented by several rocks readily separable by 

 miueralogical peculiarities and by intrusion. 



By loss of foliation the gneisses tend to pass into granites, and 

 the series is accompanied by pegmatites. 



The second group is distinguished by the wide distribution of 

 quartz-schists, with which occur quartz-mica-schists, mica-schists 

 (locally containing silliraanite), and haematite-schists. A partial 

 analysis of a specimen of the last-named showed 67*77 per cent, of 

 iron -peroxide. 



The district is compared with the Oban Hills of the Eastern 

 Province. 



January 9th, 1907— Sir Archibald Geikie, D.C.L., Sc.D., Sec. R.S., 

 President, in the Chair. 



The following communications were read : — 



1. 'On the Cretaceous Formation of Bahia (Brazil) and on the 

 Vertebrate Fossils contained therein.' By Joseph Mawson, F.G.S.. 

 and Dr. Arthur Smith Woodward, F.R.S., F.L.S., F.G.S. 



2. ' On a New Dinosaurian Pteptile from the Trias of Lossiemouth. 

 Elgin.' By Arthur Smith Woodward, LL.D.. F.R.S., F.L.S., F.G.s! 



January 23rd.— Sir Archibald Geikie, D.C.L., Sc.D., Sec.R.S.. 

 President, in the Chair. 



The following communication was read : — 



1 On the Geology of the Zambezi Basin around the Batoka 

 Gorge (Rhodesia).' By George William Lamplugh, F.B.S., F.G.S. 

 With Petrographical Notes by Herbert Henrv Thomas, M.A., B.Sc, 

 F.G.S. 



This paper contains an account of the physiographical and 

 geological structure of the hitherto undescribed country bordering 

 the Batoka Gorge, which was investigated by the author in 1905, 

 under the auspices of the British Association. 



The physical features of the country fall into two well-marked 

 divisions : — (1) The unbroken plateau, a portion of the great 

 central basin-plain of South Africa. (2) The area of rejuvenated 

 drainage, a wedge-shaped tract having its apex at the Victoria Falls, 

 due to the lowering of the trunk- drainage by the erosion of the 

 deeply-cut gorge. 



