Jennifer Gerstel, Robert Thunell, Robert Ehrlich; Danian faunal succession: Planktonic foraminiferal response to a changing marine environment. Geology ; 15 (7): 665–668. doi: https://doi.org/10.1130/0091-7613(1987)15<665:DFSPFR>2.0.CO;2
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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.