The gray clays of the Eboinda region consist of sub-rounded, fine to medium and translucent grains. A few black nodules 1 to 2 cm, sub-rounded, give off a hydrogen sulfide odor. They are strongly impregnated with bitumen. this unit yielded a rich assemblage of spores and pollen to the Cretaceous/Paleogen transition (K/Pg) namely, Longapertites marginatus, Mauritiidites crassibaculatus, Proxaperites cursus, Proxapertites operculatus, Longapertites proxapertitoids, Deltoidospora minor, Cyathidites minor, Zlivisporites blanensis, Retistephanocolpites williamsi, Spinizonocolpites baculatus. Mangrove-type paleovegetation developed in Upper Maastrichtian and in Danien. From the paleoclimatic point of view, the development of pollen mainly palms belonging to the family of Aceraceae suggests tropical and humid climatic conditions, which alternate with a warm and dry climate (development of Ephedripites sp.,) in the Upper Maastrichtian. The presence of some species of the Cytheaceae and Arecaceae family would indicate a tropical and humid climate in Danien. But the complete disappearance of the Proteaceae and Ephedraceae, indicates a cold climate at the Cretaceous-Paleogene limit.

This work presents the results of palynological analysis of the Albo-Cenomanian interval of two wells located on the Abidjan margin in the offshore sedimentary basin of Côte d'Ivoire. It aims to reconstruct deposition environments during this interval coinciding with the oceanic anoxic event (EAO1) recorded in the Atlantic. After classical chemical attacks with strong acids, the palynomorphs extracted from 114 cuttings samples were identified and counted. The results show that out of 9786 registered palynomorphs 5108 belong to the Y-3M well and 4678 to the Y-4M well. Quantitative analysis of spore groups, pollen grains (Classopollis, Ephedripites, Araucariacites), elateres and dinocysts revealed a predominantly continental (littoro-deltaic) depositional environment with marine incursions. This sedimentation occurred under a predominantly arid to semi-arid palaeoclimate under relatively humid conditions in some places. These palynological quantitative approaches will help to refine the deposit environment of the Albian in Ivory Coast.

This paper presents the results of the detailed petrographical analysis of sandstone samples from three wells from the offshore Ivorian Basin. The study reveals the presence of three types of sandstones in the Albian – Cenomanian succession, namely subarkoses, arkoses and lithic arenites, with dominant detrital minerals comprising quartz, feldspar and lithic fragments. The main authigenic minerals comprise calcite, siderite, silica, kaolinite and pyrite, while the key diagenetic events include compaction, dissolution and recrystallization of feldspar, neoformation and replacement of feldspar, and finally cementation. Primary pore spaces are reduced or occluded by calcite, silica, siderite and pyrite. Secondary porosity was created locally from the dissolution of feldspars but has been partly reduced by authigenic kaolinite. The presence of illitized kaolinite overgrowths and dissolved feldspars, together with significant quartz and the mainly concavo-convex and stylolithic contacts between quartz grains, suggest that the Albian-Cenomanian sandstones of the Ivorian Basin have reached an advanced stage of diagenesis. These diagenetic processes affect petrophysical values which varied as a function of depth.

The present work aims at the realization of a biostratigraphic study based on planktonic foraminifera associations to the transition between the middle Eocene (Bartonian) and late Eocene (Priabonian) in the section of Ben Attya (BAT).
This outcrop is flush in pelagic deposits of external Rif. The lithological point of view, the base of the section consists mainly of calcareous clay with flint sandstone intercalated with marl. Its upper part shows gray marl overlying limestone cement sandstone. The micropaleontological study to recognize associations of planktonic foraminifera characteristic of the Middle and Upper Eocene.
The Middle Eocene (Bartonian) is characterized by the association of species Acarinina pseudotopilensis, Acarinina topilensis, Acarinina spinoinflata, Acarinina bullbrooki, Truncorotaloides libyaensis, Turborotalia frontosa, Morozovella lehneri, Morozovella crassata, Orbulinoides beckmanni, Hantkenina dumblei, Turborotalia boweri, Hastigerina cf. bolivariana and Hantkenina liebusi. The Upper Eocene (Priabonian) is highlighted by the presence of species Globigerinatheka semiinvoluta, Hantkenina alabamensis, Globigerinatheka tropicalis, Turborotalia cerroazulensis, Turborotalia cocoaensis, Turborotalia cunialensis and cribrohantkenina inflata.
Over the entire range studied, five (5) expansion biozones have been recognized. The biozones Morozovella lehneri, Orbulinoides beckmanni and Morozovella crassata are characteristic of Bartonian. The biozone Globigerinatheka semiinvoluta covers the transition from Bartonian and Priabonian. The last biozone (at Globigerinatheka index) corresponds to the lower part of Priabonian.