Abstract
The new data on the ammonites faunas allow to specify the Cenomanian-Turonian biostratigraphy of the Nigerduring the transsaharian marine transgression with the description of two new horizons: Glabrum horizon and Wallsi horizon. If the endemism tendancy is corroborated mainly for the Damergou and the Iullemmeden Basin, the new results make conspicuous a strong North-South connection between the Tenere and the NE Nigeria with the presence of Vascoceras aff. glabrum (Barber), Neoptychites gr. cephalotus (Courtiller), Thomasites nigeriensis (Woods), Thomasites wallsi (Reyment) et Choffaticeras sp. Moreover a new species Thomelites (?) tenereensis nov. sp. is here describeb.
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