Wasia Gr

It is underlain disconformably by the Shu’aiba Fm, of Aptian age. The chronological list of current rock units indicates the next older unit as Mishrif Fm

It is overlain unconformably by the Laffan Fm (Coniacian-Santonian)

In Kuwait and South Iraq this includes all formations occurring between the post-Cenomanian unconformity which defines the top of the Mishrif and Magwa Formations and the unconformity at the top of the Shu’aiba Formation. The equivalent of the Wasia Group so defined has retained formation rank in subsurface sections in Saudi Arabia, rock units defined as formations to the north being assigned member status (R.W. Powers et al., 1966).

The absence of the deeper-water, limestone, Rumaila Formation is the main feature which distinguishes this from the succession found in south-east Iraq. The general similarity is borne out by the fact that three of the above formations have their type localities in south Iraq or Kuwait, while the fourth, Mauddud Formation, first defined in Qatar, is recognized in the area to the north.

The same rock units are recognized in the intervening areas of eastern Saudi Arabia, where they are assigned member status. Qatar differs from much of east Saudi Arabia and Kuwait in the absence of sandstones from the post-Mauddud sequence. This suggests that Qatar was a little more distant from the Arabian Shield during the Cenomanian.