Figure 2. Regional stratigraphy of the Niger Delta Basin showing the three major stratigraphic units present in the delta (Akata, Agbada, and Benin Formations [Fm]). The question marks note the possible occurrence of an unknown Cretaceous (Cret.) formation. The age of this formation varies depending on where you are Deep offshore to onshore (Cretaceous to Oligocene) (Corredor et al., 2005). Reprinted with permission of AAPG.