KARROO RUCKS IX THE MAFUXGA13USI, 

 SOUTHERX RHODESIA. 



Bv A. .]. C. MoLYXEUx, E.G.S. 



With Three Te.rt Figures. 



Read Jul,/ 15, 1920. 



I. IXTRODUCTIOX. 



The (listiibution of Karroo rocks in the Matiin<>ahusi and 

 the conditions under which they were accumulated are 

 frequently found to be matters on which some information is 

 desirable, in order that a comparison may be made with the 

 succession of the same system of rocks in tlie AVankie coalfield 

 (3)* some 100 miles to the west, and with the Upper Karroo 

 strata to the north-west of Bulawayo (4 and 5), which are the 

 only localities that have been mapped by the Geoloo-ical Survey 

 in detail. A part of the Mafungabusi is included in the 

 traverses that formed the basis of the introductory paper 

 to the geology of the region by the writer in 1903 (T), while 

 Mr. C. E. Parsons in 1903 gave a section, with notes of a route 

 he had made from Gwelo to the Zambezi. 



As the writer had made journeys across the region many 

 years ago and taken route maps and geological notes on each 

 occasion it has been suggested that he should look up these 

 records for publication. Fragmentary as each single section 

 must be owing to the circumstances in which it was made, the 

 piecing togetlier of the whole presents evidence on which the 

 conclusions around it in this paper may be reasonably based. 

 But it ]s not presented as being incapable of error. 



II. — Physical Features. 



The region known as the Mafungabusi lies in the Zambezi 

 basin and on the west of the TTmniati River. t It incdudes the 

 head-sUeams of the Sesami and IKime Riveis, flowing north- 

 north-west, the Xgondomo vlei circling- round the south, and 

 several eastward lunning tributaries of the I^mniati, namely, 

 the Mzongwe, Xvoripakv/e and Paruka. Cartographicallv it is 

 placed between 17° 40' 00" S. and 18° 20' 00" S., while the 

 meridian of 28° 45' 00" E. cuts through its centre. 



* The numbers in brackets refer to the papers listed in the 

 References at the end of this memoir. Tliese papers are discussed in 

 Section V of this memoir. 



t In many Rhodesian rivers the name applied to different parts of 

 its course varies. Tliis river is known as Umniati as far as its confluence 

 with the Fmfuli, then as the Sanyati. Ume, Bume and Ome (Omay) are 

 local terms for the other river referred to. 



