Sawagir Fm

Khartoum Basin, central Sudan. At the type section the Sawagir Formation was encountered between approximately 1958 m and 1207 m (6425 ft - 3960 ft).

Reference: Awad (1994), A. Gibreel (2015)

[Fig. 1: Khartoum Basin is #8 on map (Fig.3 in Awad, 1994)]

[Fig. 2: Khartoum Basin stratigraphy and depositional sequences (pg. 17 in A. Gibreel, 2015)]

"The Sawagir Formation is predominantly made up of sandy material. The grain size varies from very fine to very coarse, and the grain shape is subangular and angular. The grains are translucent to clear Sandstones are variably kaolinitic and argillaceous. In general, the formation comprises alternating sandstones and reddish to brownish claystones which grade into predominantly loose kaolinitic sands and claystones in the middle and upper parts, respectively. The claystones in the upper part are locally tuffaceous, and they are interbedded with massive volcanics. These claystones/ volcanics interbeds are treated here, as by Sun Oil (unpubl. rep ), as part of the Sawagir because the basinwide unconformity that defines the upper boundary of the Sawagir Formation occurs above this lithological "sub-unit". This "sub-unit" grades downwards to sandstone and claystone interbeds that typify the Sawagir Formation." (Awad, 1994)