1. Introduction.- 2. Stratigraphy.- 2.1 General Geology and Basin Summaries.- 2.2. Basement Complex.- 2.3. Jurassic Igneous Complexes 20.- 2.4 Cretaceous System.- 2.4.1. General.- 2.4.2. Southern Nigeria including Anambra Platform, Abakaliki Trough and Calabar Flank: Pre-Santonian Lower and Upper Cretaceous Formations.- 2.4.2.1. Lower Cretaceous Formations.- 2.4.2.1.1. General.- 2.4.2.1.2. Asu River Group.- 2.4.2.2. Upper Cretaceous rocks Pre-Santonian Southern Nigeria.- 2.4.2.2.1. General.- 2.4.2.2.2. Odukpani Formation.- 2.4.2.2.3. Keana Sandstone.- 2.4.2.2.4. Mamfe Formation.- 2.4.2.2.5. Eze-Aku Shale Group including its relationships with the Ameseri Sandstone, Agala Sandstone and Konsisha River Group.- 2.4.2.2.6. Awgu Shale and Agbani Sandstone.- 2.4.2.2.7. Umuna-1, Annua-1 and Ikono-1 Volcanics;.- 2.4.2.3. Hydrocarbon prospects Southern Nigeria including Anambra Platform, Abakaliki Trough and Calabar Flank: Pre-Santonian Lower and Upper Cretaceous Formations.- 2.4.2.3.1 Pre-Santonian prospects, Anambra Platform.- 2.4.2.3.2. Pre-Santonian prospects, Abakaliki Trough.- 2.4.2.3.3. Pre-Santonian prospects; Calabar Flank and Hinge Line.- 2.4.3. Lower and Upper Benue Trough: Pre-Santonian Lower and Upper Cretaceous Formations.- 2.4.3.1. General definition and subdivision of the Benue Trough.- 2.4.3.2. Lower Cretaceous Formations, Lower and Upper Benue Trough.- 2.4.3.2.1. Asu River Group.- 2.4.3.2.2. Awe Formation.- 2.4.3.2.3. Bitna Sandstone.- 2.4.3.3. Upper Cretaceous Pre-Santonian Formations Lower and Upper Benue Trough.- 2.4.3.3.1. General.- 2.4.3.3.2. Awe Formation.- 2.4.3.3.3. Keana Formation.- 2.4.3.3.4. Eze-Aku Formation.- 2.4.3.3.5. Awgu Formation.- 2.4.3.3.6. Bima Sandstone.- 2.4.3.3.7. Yolde Formation.- 2.4.3.3.8. Dukul Formation.- 2.4.3.3.9. Jessu Formation.- 2.4.3.3.10. Sekule Formation.- 2.4.3.3.11. Numanha Shales.- 2.4.3.3.12. Lamja Sandstone.- 2.4.3.3.13. Pindiga Formation.- 2.4.3.3.14. Gulani Formation.- 2.4.4. Gongola Trough, Bornu Basin and Yola Trough Upper Cretaceous Pre-Santonian Formations.- 2.4.4.1. General.- 2.4.4.2. Upper Cretaceous Pre-Santonian Formation, Gongola Trough, Bornu Basin and Yola Troughs.- 2.4.4.2.1. Gongila Formation.- 2.4.4.2.2. Fika Shales.- 2.4.4.2.3. Bima-Yola Formation.- 2.4.4.3. Hydrocarbon Prospects of the Lower and Upper Benue, Gongola and Yola Troughs and the Nigerian Section of the Bornu Basin Pre-Santonian Lower and Upper Cretaceous Formations.- 2.4.4.3.1. General.- 2.4.4.3.2. Source Rocks.- 2.4.4.3.3. Reservoir Rocks.- 2.4.4.3.4. Specific Prospects in Lower Benne Trough.- 2.4.4.3.5. Specific Prospects in Upper Benue Trough.- 2.4.4.3.6. Prospects in the Gongoia and Yola Troughs.- 2.4.5. Sokoto Basin or Embayment Nigerian Section of Iullemmeden Basin Upper Cretaceous Pre-Santonian Formations.- 2.4.5.1. General.- 2.4.5.2. Upper Cretaceous Formations Sokoto Embayment.- 2.4.5.2.1. Gundumi Formation.- 2.4.5.2.2. Illo Formation.- 2.4.5.2.3. Petroleum Prospects of the Gundumi and Illo Formations.- 2.4.6. Post Santonian Upper Cretaceous Formations.- 2.4.6.1. Southern Nigeria including Anambra Basin, Abakaliki Fold Belt, Afikpo Syncline and Calabar Flank.- 2.4.6.1.1. Nkporo Shale.- 2.4.6.1.2. Owelli Sandstone.- 2.4.6.1.3. Otobi Sandstone.- 2.4.6.1.4. Enugu Shales.- 2.4.6.1.5. Mamu Formation (Lower Coal Measures).- 2.4.6.1.6. Ajali Sandstone.- 2.4.6.1.7. Nsukka Formation (Upper Coal Measures).- 2.4.6.1.8. Lafia Formation.- 2.4.6.1.9. Gombe Sandstone.- 2.4.6.2. Bida Basin and adjacent areas Upper Cretaceous Post Santonian Formations.- 2.4.6.2.1. General.- 2.4.6.2.2. Nupe Group.- 2.4.6.2.3. Bida Sandstone Formation.- 2.4.6.2.4.Sakpe Ironstone Formation.- 2.4.6.2.5. Enagi Siltstone Formation.- 2.4.6.2.6. Batati Ironstone Formation.- 2.4.6.2.7. Lokoja Sandstone.- 2.4.6.2.8. Patti Formation.- 2.4.6.2.9. Oolitic Ironstones Agbaja Plateau.- 2.4.6.2.10. Correlation of Lokoja Sandstones and Patti Formations with the Nupe Group and the Late Cretaceous Sequence of the Anambra Basin, Northwest Flank.- 2.4.6.3. Hydrocarbon Prospects of the Post Santonian Upper Cretaceous Rocks of the Anambra Basin, Abakaliki Fold Belt, Afikpo Syncline, Calabar Flank and Benue Depression and Flanking Basins.- 2.4.6.3.1. General.- 2.4.6.3.2. Anambra Basin Prospects.- 2.4.6.3.3. Calabar Flank Prospects.- 2.4.6.3.4. Other Basins.- 2.4.6.4. Iullemmeden Basin, Sokoto Area Upper Cretaceous Post Santonian Formations.- 2.4.6.4.1. General and Rima Group.- 2.4.6.4.2. Taloka Formation.- 2.4.6.4.3. Dukumaje Formation.- 2.4.6.4.4. Wumo Formation.- 2.4.6.4.5. Conditions of Deposition of Rima Group and General Palaeogeography.- 2.4.6.5. Hydrocarbon prospects of the Post Santonian Upper Cretaceous rocks on the Nigerian Section of the Iullemmeden Basin.- 2.4.6.6. Dahomey Miogeocline, Western Nigeria and Benin Flank: Upper Cretaceous Post Santonian Rocks.- 2.4.6.6.1. General.- 2.4.6.6.2. Abeokuta Formation.- 2.4.6.7. Hydrocarbon Prospects Dahomey Miogeocline, Nigerian Section Post Santonian Upper Cretaceous Rocks.- 2.5. Cenozoic Erathem in Nigeria.- 2.5.1. General.- 2.5.2. Iullemmeden Basin, Sokoto Section, Northern Nigeria Cenzoic Formations.- 2.5.2.1. General.- 2.5.2.2. Gwandu Formation.- 2.5.2.3. Gamba Formation.- 2.5.2.4. Kalambaina Formation.- 2.5.2.5. Dange Formation.- 2.5.2.6. Hydrocarbon Prospects of the Cenozoic Gwandu Formation and Sokoto Group of the Nigerian Section of the Iullemmeden Basin.- 2.5.3. Bornu Basin and adjacent Southern Chad Basin Cenozoic Formations.- 2.5.3.1. General.- 2.5.3.2. Kerri-Kerri Formation.- 2.5.3.3. Jos Sediments.- 2.5.3.4. Chad Formation.- 2.5.4. Dahomey Miogeocline, Western Nigeria Cenozoic Formations.- 2.5.4.1. General.- 2.5.4.2. Imo Shale.- 2.5.4.3. Ewekoro Formation.- 2.5.4.4. Ameki Formation.- 2.5.4.5. Oshoshun Formation.- 2.5.4.6. Illaro Formation.- 2.5.4.7. Ijebu Formation.- 2.5.4.8. Ogwashi-Asaba Formation.- 2.5.4.9. Benin Formation (surface).- 2.5.5. Niger Delta complex Cenozoic Formations.- 2.5.5.1. General.- 2.5.5.2. Benin Formation (subsurface).- 2.5.5.3. Afam Clay Member (subsurface).- 2.5.5.4. Agbada Formation (subsurface).- 2.5.5.5. Akata Formation (subsurface).- 2.5.5.6. Imo Shale Formations (surface).- 2.5.5.7. Ameki Formation (surface).- 2.5.5.8. Ogwashi-Asaba Formation (surface).- 2.5.5.9. Benin Formation (surface).- 2.5.5.10. Agbada (surface) and Akata (subsea) formations.- 2.5.5.11. Formations and environments of the Late Quaternary Niger Delta.- 2.5.5.11.1. Upper Flood Plain Environment and Deposits.- 2.5.5.11.2. Lower Floodplain Environment and Deposits.- 2.5.5.11.3. Mangrove Swamp Environment and Deposits.- 2.5.5.11.4. Beach Environment and Deposits.- 2.5.5.11.5. River Mouth bar Environment and Deposits.- 2.5.5.11.6. Delta front Platform Environment and Deposits.- 2.5.5.11.7. Pro-Delta Slope Deposits.- 2.5.5.11.8. Open Shelf Environment and Deposits.- 2.5.5.11.9. Older Sands.- 2.5.5.12 Present day Niger Delta and Niger-Benue drainage system: Basic Environmental Data.- 2.5.5.12.1. General.- 2.5.5.12.2. Niger-Benue Sediments.- 2.5.5.12.3. Distributive Agents, River Flows.- 2.5.5.12.4. Distributive Agents, Tidal Flows.- 2.5.5.12.5. Distributive Agents; Wind-Wave Currents.- 2.5.5.12.6. Distributive Agents; Longshore drift and the Niger Delta Submarine Canyons.- 2.5.5.13. Size, shape, etc. of the Niger Delta Complex and the Present Day System.