The results of the granulometrical and sequential analysis supported by micropaleontological dating using the foraminifera as well as chemico-ponderous and X-ray diffraction analysis,confirmed the contemporaneity of the Burdigalian outcrops of the two studied zones(Ain Sidi Salah zone in the northeast and Fedj El Behim zone in the southwest), both located at the north of the city of Ouenza in the The results of the granulation and sequential analysis supported by micropaleontological dating using the foraminifera as well as chemico-ponderous and X-ray diffraction analysis, confirmed the contemporaneity of the Burdigalian outcrops of the two learned zones (Ain Sidi Salah zone in the northeast and Fedj El Behim zone in the southwest), both located at the north of the city of Ouenza in the