Other reservoir rocks are found in the Tithonian Dupuy Member of the Upper Dingo Claystone and the deep-water fan Angel Sandstone of the Dupuy Member, which produces at Wanea, Cossack, and Angel fields. The Dupuy submarine fan built into the Barrow sub-basin from the east and southeast across the Dingo Claystone. This interval contains reservoirs on tectonically high fault blocks on the Exmouth Plateau, Rankin Platform trend, and areas of the eastern edges of the sub-basin trend and the inner structural terraces. Within the sub-basin trend the interval has not been reached by the drill and is not readily imaged by seismic data. Overall, porosity and permeability are good in all reservoir facies.
Primary porosity is largely preserved and secondary porosity can be a contributing factor.
Minor quartz overgrowths, authigenic clay and feldspar dissolution are reported. It is approximately 900 m thick and interfingers with the distal basinal deposits of the Barrow Group and onlaps the top of the succession. Maximum transgression occurred in the Aptian Stage after a slow reworking of the top of the Barrow delta into the Birdrong Sandstone and Mardie Greensand.