Calcareous nannoplankton from Haumurian to Waipawan strata in Mid-Waipara section indicate three distinctive biostratigraphic zones similar to those across the Cretaceous-Tertiary boundary in Europe and North America. The lowest zone (uppermost Haumurian) containsDeflandrius cretaceus ?, Kamptnerius magnificus, Nephrolithus barbarae, and other species diagnostic of the Upper Cretaceous. The middle zone (Lower to Middle Teurian) lacks species diagnostic of the Cretaceous and contains only species which have Danian affinities. It is divided into two subzones: the lower subzone is marked by the entry ofCoccolithus danicusandZygolithus concinnus, and the upper subzone by the entry ofCoccolithus bisulcus. The highest zone recognised (lowermost Waipawan) is correlated with the Upper PaleoceneDiscoaster multiradiatuszone of Bramlette and Sullivan.