"Evidence is presented of the great change in calcareous nannoplankton fossils between the Maestrichtian and Danian, and indicates that it represents primarily a remarkable extinction of a large number of distinctive Cretaceous genera and species. Type areas and sequences in other parts of Europe, north Africa, and the southern United States have been examined, and biostratigraphic correlations are indicated. Six new genera and twelve new species are described, and emended descriptions of some other taxa are presented."

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