Preliminary Investigation of Late Turonian-Early Campanian Shallow Marine Foraminifera of the Mungo River/Logbadjeck Formation, NW Douala Basin, Cameroon

Abstract

Sediments of the Mungo River (also Known as Logbadjeck) Formation outcrop in several small sections in areas around Bombe, Mbalangi and Ediki villages in Meme Division of the South West Region of Cameroon. Outcrops were encountered mainly along river channels notably, the Mungo, Ediki, Kendonge and their tributaries and other exposures in farmlands. All the lithofacies described elsewhere from subsurface samples are represented in this area (shales, limestones and marlstone, frequently intercalated by sandstones and siltstones). However, only a composite stratigraphic framework for the study area can be constructed from these small isolated outcrops. A fairly abundant and diverse foraminiferal assemblage was recovered from mostly the shales and marlstones and includes both the planktonic and almost exclusively calcareous benthonic forms. The heterohelix and hedbergella dominated the planktonics while others include: Whiteinella inornata, Marginotruncana renzi, Clavihedbergella...