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...

A review of the compositional features Tunisia, Algeria, and Morocco phosphorites is proposed in order to assess compare paleoenvironmental conditions that promoted deposit formation as well provide information about their economic perspective light growing worldwide demand. Since these deposits share a very similar chemical mineralogical composition, attention was focused on geochemistry rare ...