Abstract
Three small Karoo grabens (Entebbe, Dagusi and Bugiri) along the northern shore of Lake Victoria cover altogether less than 50 km 2. At Entebbe, outcrop and subsurface data exhibit up to 357 m of dark, laminated varved shales of probable glacio-lacustrine origin. The occurrences at Dagusi may represent proximal deposits of fluvio-glacial outwash deposits. Lithostratigraphic corelations with periglacial deposits from other East African countries suggest that the Ugandan occurrences belong to the northernmost part of the broad belt of Gondwana glaciation extending from South Africa up to Ethiopia. The deposits are preserved in grabens with adjoining fault contacts with the Precambrian basement. The sequences can be dated as Early Permian due to their macrofloral content including Gangamopteris, Cyclodendron, Glossopteris indica and Cornucarpus. The economic potential in respect to coal and other hydrocarbon occurrences appears to be low.
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