Three wells (Naf-2, Naf-3 and Naf-101), were described and sampled in order to increase understanding of the stratigraphy and micropaleontology of the North Abu Qir Field, Nile Delta, Egypt. Lithostratigraphic studies aided recognition of the following Miocene-Pliocene rock formations (from base to top);

Fifteen species and three subspecies of foraminifera and forty-four species of ostracods are described from subsurface borehole Horus Well-in the northwestern desert of Egypt. The stratigraphic significance of some benthonic foraminifera (Thomasinella, Nezzazata and Nezzazatinella) furnish new information on the age determination. Cenomanian-Santonian time is suggested for the studied interval (Bahariya and Abu Roash Formations). Among the identified ostracodes, three species of Bairdia are described for the first time: B. bassiounii, B. compressa, and B. elongata. Also, one new subspecies of Nezzazata, N. convexa conica, is discussed. The identified foraminiferal species belong to 12 families:

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