By David S. G. Thomas, Paul A. Shaw

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Karoo deposition in the separateNorthwest Botswana Basin of Smith (1984)representsthe earliest sediment accumulation in the Okavango Rift, which was from the mid-late Karoo (Lebung/Stormberg) or possibly Ecca, onwards, and possibly earlier, in response to the tectonic 'emergence' ofthe Ghanzi Ridge. Rifting and faulting also affectedsedimentation in the Northeast Botswana Basin and its continuation into western Zimbabwe (Lockett, 1979; Smith, i984), to the extent that Ellis (i97g) regarded sedimen.

Rifting and faulting also affectedsedimentation in the Northeast Botswana Basin and its continuation into western Zimbabwe (Lockett, 1979; Smith, i984), to the extent that Ellis (i97g) regarded sedimen. tation in the southern area to have occurred in a,Nata Sub_basin,. ^id to have been . a upland which exerted a major control on Dwyka glaciation DS:;. rotubl. es occurring in the tectonically active zones which emerged in the Northern Kalahari as the beginning of the division of Gondwanaiand uround 200 M".

Ifiedafter Jones(1982), Snith (ig}4) and othersources. east of 72"E, Archaean rocks lie directly beneath between 50 and 200 m of Kalahari sediments in places. This is not reflected in the geological surveys, for the small and scatteredsurface outcrops ofPrecambrian rocks shown by Mallick et dl. (1981) in this area, usually in the vicinity of pans, are largely placed in the Ptotetozoic Waterberg Group and Transvaal Sequence, confirming Jones,s (1982)view that even to the south of the Medial Rift, basement rocks possessa fairly extensive sub-Kalahari cover which dates from the mid-Precambrian.

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