Paleogene Tropical Planktonic Foraminiferal Biostratigraphy and Magnetobiochronology

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Abstract
Confusion has arisen over the connotation and correlation of two competing tropical-subtropical Paleogene planktonic foraminiferal zonations (Berggren 1969; Blow 1979). This derives from the fact that the former scheme, when originally published, was viewed as provisional and precise definitions were not given for the zonal system. We review here the development of these two zonal schemes in a historical context, present a definition, in part revised and updated, of the P-zonation system of Berggren (1969), and correlate this and related zonal schemes to a magnetostratgraphic and, ultimately, magnetobiochronologic framework to the extent possible.