The exposed formations in the studied area in upward sequence are: Euphrates, Nfayil, Injana, Zahra and Dibdibba. Nfayil Formation consists mainly of two main cycles in the studied area (in some places a third sub cycle is developed); each cycle consists of lower marl unit and upper carbonate unit.
More information has been added to the stratigraphy of the area. A unit consists of alternation of red claystone, siltstone and sandstone which was considered the Upper Member of Nfayil Formation in the previous works has been added to Injana Formation, in the present work based on solid field data. The lower and upper contacts of Injana Formation have been reviewed and defined exactly. In addition, the formation is divided into two units in the present work, these are: the Lower Clastic Unit, which consists of alternation of red to reddish brown claystone, siltstone and sandstone with some thin marly limestone horizon, and the Upper Cave – Forming Claystone Unit, which consists of brown to reddish brown cave –forming claystone, topped by thin marly limestone bed. Clear interfingering between Zahra and Dibdibba Formations is recorded particularly in Lissan area, which indicates that they are of the same age. The contacts between the formations are defined clearly in an area, which is considered to have high economic potential such as celestite, attapulguite and feldspar. |