The Pliocene in the marines blue marl of Ouled Maallah North (Dahra, Algeria).

Abstract

The locality of Azaizia has been the subject of a detailed study. Indeed, the stratigraphic section of the lower Pliocene of Azaizia ,offers a succession of markers ranging from Sphaeroidinellopsis, Globorotalia margaritae, Gl. Puncticulata, Globorotalia crassaformis indicating the base of the Pliocene (Zanclean , The nannofossils reveal the presence of "Ceratolithus acutus (B 5.36 Ma, T 5.04 Ma)" from the extreme base of the Pliocene (Zancléen), Amaurolitus primus (T 4.58 Ma) "and" Reticulofenestra pseudoumbilicus (T 3.7 Ma) » These data are exceptional, because of the presence, for the first time, of the extreme base of Zanclean in the Chélif basin and in the Dahra massif. This stratigraphic section becomes a reference section.