Planktonic foraminiferal evolution following the Cretaceous/Tertiary boundary extinction event is marked by a series of events in which one assemblage is rapidly replaced by another. This pattern is characteristic of a highly changing pelagic environment. The observed changes in the planktonic foraminifera may be related to long-term changes in oceanic productivity that persisted for about the first 2 m.y. of the Danian.

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