Formation | Lithology | Age | Basin |
Benin Formation Ogwashi Asaba Formation Ameki Formation/Nanka Sand Imo Formation | Coarse to medium sand with subordinate silt and clay lenses. Sandstones, Shale | Tertiary | Niger Delta |
Nsukka Formation Ajali Formation Mamu Formation Enugu/Nkporo/Owelli Formation | Sand, clay, and silt or lignite, Coals, Limestone Sandstones, Claystones Coal with clastic sediments Shales, Sandstones, | Cretaceous | Anambra |