Paleoenvironmental and paleogeographic characterization of the 12 frères borehole, fresco, southwestern Côte d’Ivoire: Palynological implication

Maastrichtian to Ypresian-dated sediments from the 12 Frères borehole. (Fresco, southwestern Côte d'Ivoire), are here investigated for paleoenvironmental and paleogeographic significance. For this study, preparation of palynological slides in laboratory is done three steps.: (1) sampling physical treatment, (2) chemical attacks (HCl 10%, HF 40%) dissolve mineral matter preserve organic contained sediments, (3) mounting collected between slide coverslip microscopic study. Quantitative analyses dinoflagellate cysts other palynomorphs have allowed reconstructions paleoenvironments. Thus, bottom top, nine (9) depositional environments ranging outer neritic inner via a lagoon or estuarine environment were determined. Following Lentin Williams (1980), deposits section attributed tropical subtropical province paleogeography.