加蓬、多哥、塞内加尔、摩洛哥和突尼斯的磷块岩矿床分布在西非大陆边缘晚白垩世及始新世海岸盆地中,它们与古代上升洋流有着明显的联系。此类盆地普遍发育碳酸盐类、燧石、富硅粘土矿物和磷块岩,盆地内的沉积物是依浓缩系列沉积下来的。盆地各个部分的封闭程度对磷酸盐堆积有重要意义。 Phosphorite deposits in Gabon, Togo, Senegal, Morocco and Tunisia are located in the Late Cretaceous and Eocene Coastal basins on the margins of the West African continent and are clearly linked to ancient upwelling currents. Carbonates, chert, siliceous clay minerals, and phosphorite are commonly developed in these basins, and the sediments in the basin are deposited in a concentrated series. The degree of closure of various parts of the basin is of great significance for phosphate accumulation.