CoKMiKLATIOX OK TIIK KaIIHOO SysTKM I\ HhODKSIA. 10^ 



depeiuluble yeDloi^ieil l)iMich-iiiark of the soutliLTii stati's. Tlif slij^ht 

 evidence so far a\ailal)le inclines nie to the Ecca hori/oii. 



y, r, ( CiKvl series (Tuli ilistrict) 



(Lower Matobohi beds (Zambesi Valley) 



U[' to the present the most northerly occurrence of the Glacial 

 Conglomerate has been recorded from Palapye, Lat. 22 40' 8. outside 

 and south of the borders of Southern Rhodesia. This field is, however, 

 connected with that of the Tuli district. 



In the al)sence from the Zambesi region of any discovery of glacial 

 features, that bench-mark cannot be used to build up our correlation. 

 One has, however, come to look upon the coal measures as a part of 

 the oldest series of the system. The}' are found frequently to lie 

 immediately and unconformable' on the floor of the older complex. 

 In the Tuli region they are but 30 ft. above the basal gneisses, and 

 in North-Western Rhodesia they ha\e the same position. 



Palieontological evidence points to Permo-carboniferous age, the 

 fossils discovered being Gl(>sso]tffiris hidicd, pith casts of Schizon.fiira, 

 Estheria and a ganoid fish from the Sengwe. 



The coal-bearing series of Rhodesia may therefore, provisionally 

 perhaps, until other evidence is forthcoming, be classed as Ecca. 



■D f , . • (Escarpment grits 400-1500 feet, 

 15eautort series y^^^^^. Matobola beds, 300-1000 feet 



This series comprises two dissimilar classes of material, pointing 

 to a difference of origin and dynamical conditions, and which elevates 

 the latter into an important subdivision. Both attain great thickness 

 in the Zambesi valley, where the grits form mountains lying between 

 the Gwai and the Seliungu rivers, and also the striking escarpment 

 wall that stretches for 200 miles east and west, and that overlooks the 

 plains of the septarian beds. 



The upper Matobola beds are made up of a great depth of clays, 

 generally unstratified, containing layers of calcareous and ferruginous 

 nodules, of septarian form, with silicified wood, ironstones and shelly 

 limestones Gypsum occurs in thin laininse among the clays, or 

 in fibrous beds, and there are also fine buff sandstones, with little 

 bedding. 



Neither of these divisions is represented in the Tuli region. 



Fossil discoveries comprise the silicified wood, and a small bi\'alve 

 points to Permo-carboniferous age, and is probably referable to the 

 group Pahi'omuteJa keuserli'.igi — -some elongated specimens suggesting 

 a similarity with those found at Graaft'-Reinet. The earthy limestones 

 show on their weathered surfaces many fragments of bone, and some 

 complete ones that so far have not been identified. 



This is slight support to correlation with the Beaufort shales. 



Above the fine beds mentioned are the Escarpment grits — red 

 and brown, coarse, felspathic, with subangular pebbles and pellets and 

 lenticles of clay. Current-bedding is plentiful, and there are fi-equent 



