Main formations

Lithology (age range)

Environment

Benin

Continental massive sands and rare shale interbeds (Upper Miocene to Recent)

Alluvial and coastal plain

Agbada

Siliciclastic deltaic sequence. Interbeds of sands and silts designated by “S” and shale designated by “M” (Upper Miocene to Recent)

Delta front, prodelta, fluvio-deltaic

Akata

Undercompacted marine shales, local turbiditic sandstones (Nguti, Isongo, Oongue), channel fill or offshore bar deposits (Etisah, Qua Iboe, Rubble beds …) (Palaeocene to Recent)

Prodelta, Deepwater