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.

Clay , Shales, Sandstones and Lignite

Sandstones, Clay , Shales, Limestone

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, Clay , Ironstones, Siltstones

Cretaceous

Anambra