A lower Cretaceous (Aptian-Albian) evaporitic and carbonate sequence overlying basal pre-Aptian detrital deposits, and upper Cretaceous-Eocene and Miocene marine sandstones, shales, and limestones are represented in the Cuanza basin. Sedimentation in the basin was influenced by salt tectonics as well as by migration of hinge flexures eastward during the Cretaceous and westward in the Tertiary. Petroleum occurrences are recorded in most of the formations, but commercial accumulations have been found so far only in the lower Cretaceous beds, of which the most productive are fractured limestones of the Dinga formation on the crests of nonpiercement salt domes and salt anticlines. Potential source beds and reservoir rocks occur widely throughout the section.

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