The Eocene/Oligocene Boundary Event in the Deep Sea

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Science  16 Nov 1984:
Vol. 226, Issue 4676, pp. 806-810
DOI: 10.1126/science.226.4676.806


Analysis of middle Eocene to early, Oligocene calcareous and siliceous microfossils shows gradual biotic changes with no massive extinction event across the Eocene/Oligocene boundary. Biotic changes in the late Paleogene appear to reflect changing paleoclimatic and paleoceanographic conditions and do not support suggestions of a catastrophic biotic event caused by a bolide impact at the Eocenel Oligocene boundary.