Productivity change as a control on planktonic foraminiferal evolution after the cretaceous/tertiary boundary

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Abstract
The rate of evolution of Palaeocene and Early Eocene planktonic Foraminifera is examined using taxonomic data from two distant sites. The two million years immediately following the Cretaceous/Tertiary boundary was characterised by low rates of evolution within the group. Peaks in the rate of species turnover at 62.5 and 57.5 Ma suggest a close relationship between the evolution of this group and changes in ocean productivity and therefore the intensity of the sub‐surface oxygen minimum zone. A model for the evolution of the early Palaeogene planktonic Foraminifera is proposed.