384 Geological Societij. 



siding, M'here certain plant-remains were found. By these sections 

 the boundary or line of unconformity is traced from the Mafungi- 

 busi district, round the promontory of granites and shales which 

 form the backbone of Matabeleland, to the Tuli district and Sabi 

 River on the south. Except in the Tuli district, where an un- 

 conformity between the veined sandstones and the Coal-!Measures is 

 noticed, there are no definite breaks in the order of stratification ; 

 and it is by the general arrangement of superposition and character- 

 istic features that the strata fall into certain groups. Xo attempt 

 is made to correlate the strata with the Cape and Karoo systems ; 

 and for the present the author gives the following provisional 

 classification : — 



Thickness infect 



Taba 'Sinduna Series Sandstones and volcanic i-ocks ... 200 



Forest Sandstones 1000 



Escarpment Grits .* 400 



Upp3r Matobola Beds "^, Coal-Measures 300 



(tbssiliferous). | 



Basse Series )- Sandstones and grits 300 



(fossili ferous). | 

 Lower Matobola Beds ) Coal-Measures 200 



c;-- • c? • f Quartzites and current -bedded 



bijarira henes < ^ t . ctcnd 



•^ I sandstones 2000 



Great unconformity. 



Basement-rocks: — Gneiss, schists, and pegmatites of 

 Mat'ungibasi and Lubu. 



Fossils have been found in the Coal-Measures, comprising mol- 

 lusca, plant- and fish-remains, which are described in appendices. 

 These indicate the age of these beds to be Permo-Carboniferous. 



The Coal-Measures yield coal of excellent quality, and the areas 

 in which seams outcrop, or have been developed, are described under 

 the names of the Mafungibusi, Sesami, Sengwe, Lubu, Sebungu, and 

 Wankies Coalfields in the north, and the Tuli and Sabi Coalfields in 

 the south. 



Reference is made to the numerous mineral springs, of varying 

 temperature, that are dotted along the Zambesi Valley, and to 

 mounds of travertine, containing recent freshwater- and land-shells, 

 that have been accumulated by extinct springs. 



Volcanic rocks are well displayed in a long area extending from 

 Macloutsie to the Bubi River, 200 miles ; and the extinct craters 

 are still recognizable at Tort Tuli, which gives the name to this 

 tract of Tuli Lavas. Sheets of basalt are interbedded with the 

 Forest Sandstones at the Bubi and Gwampa Rivers; and at a portion 

 of the escarpment above the Sesami Coalfield, basalt forms a capping 

 and extends back about 24 miles. 



Three Appendices are added : one, on a Xew Species of Acroleins 

 from the Sengwe Coalfield, by A. Smith Woodward, LL.D., F.R.S., 

 F.GiS. ; a second, on some Lamellibranch Mollusca, by Wheelton Hind, 

 M.D,, F.R.C.S., F.G.S. ; and a third, on some Fossil Plants from 

 Rhodesia, by Mr. E. A. Xewell Arber, M.A., F.G.S. 



