The Rio del Rey sub-basin belonging to the Cretaceous–Cenozoic coastal basins of Cameroon is studied with geochemistry (major and trace elements) associated mineralogy, palynology petrography. One dominant facies (calcareous shales/siltstones/claystones) occurs in Cretaceous series two others fine- coarse-grained sandstones calcareous claystones/shales Paleocene series. Ratios LREE/HREE (9.27–2...