Abstract
Une r�partition biostratigraphique des orbitolinid�s cal�e sur la biozonation � ammonites a �t� �tablie pour l'Hauterivien sup�rieur et le Barr�mien inf�rieur pro parte du SE e la France. Elle est bas�e sur l'�tude de huit coupes de terrain relev�es dans le SE de la France, qui ont livr� des orbitolinid�s, encadr�s ou surmont�s par des faci�s � ammonites associ�es parfois � des �chinides et des dasycladales significatifs sur le plan biostratigraphique. Il est �tabli � cette occasion que trois esp�ces d'orbitolinid�s caract�risent l'Hauterivien sup�rieur�: il s'agit de Praedictyorbitolina busnardoi, Paleodictyoconus beckerae et Valserina primitiva..
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