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 containe...

Abstract. Improvements in our capability to reconstruct ancient surface-ocean conditions based on organic-walled dinoflagellate cyst (dinocyst) assemblages from the Southern Ocean provide an opportunity better establish past position, strength and oceanography of subtropical front (STF). Here, we aim late Eocene early Miocene (37–20 Ma) depositional palaeoceanographic history STF context evolvi...