Paleocene and Eocene diatom biostratigraphy and taxonomy of eastern Indian Ocean Site 752

Abstract

The Paleocene/Eocene boundary was recovered for the first time in diatom-bearing sediments at Broken Ridge, Site 752. Diatom assemblages are documented throughout the 180-m-thick sequence of upper Paleocene to lower Eocene sediments. Age control available from magnetostratigraphy, calcareous nannofossils, and planktonic foraminifers allows calibration of diatom datum levels to absolute time. A partly new/partly revised diatom zonation is proposed for the Paleocene/early Eocene. Three new taxa are described: Anaulus fennerae n.sp., Stictodiscus bipolaris n.sp., and Hemiaulus peripterus var. longispinus n.var. -from Author