Figure 18: Regional basin history, phase three. This figure illustrates the geometrical relationships between the Hawar sequence, the Shu'aiba sequence, the first Bab sequence, the second Bab LST, and the Sabsab TST. Figure caption: A- Bacinella microbial facies; B- rudistid facies; C- lateral facies change; black facies = organic-rich Bab facies; blue facies = Orbitolinid-rich Sabsab facies (modified from , 2000).