In the Chap. 6, E. Kadima, D. Delvaux, M. Everaerts, S. Sebagenzi, and F. Lucazeau focus on these lowermost Neoproterozoic to Cambrian succession beneath the centre of the Congo Basin and use this to better constrain the early evolution of the Congo Basin. These authors draw on earlier work of Kadima and reinterpret the old drill core and seismic data, especially from the two fully cored, deep stratigraphic wells Gilson-1: 4,563 m and Mbandaka-1: 4,350 m) that appear to terminate in carbonates that contain intriguing evaporitic-like minerals at the base of the Congo Basin. With this information, they then correlate the successions with the carbonate-siliciclastic sequences along the peripheral margins of the Congo Basins (mentioned in the earlier chapters). The main findings of this work are the recognition of possible major Neoproterozoic (mechanical) rifts that underlie the overlying, but poorly dated, Phanerozoic cover, which they interpret as thermal subsidence sequences. This is an important contribution towards unravelling the origin of the Congo basin.