A larger benthic foraminiferal zonation for the Cenozoic of the Americas

Abstract

The Cenozoic of the Americas does not have a zonation based on Larger Benthic Foraminifera (LBF) unlike the Tethys where there is a shallow-water benthic zonation. We have calibrated LBF, stratigraphic distributions and events using calcareous nannoflora (Paleocene-Eocene), planktic foraminifers (Oligocene-Miocene) and published strontium (Sr) isotope values. We define 29 zones spanning the Paleocene to late Pliocene interval based on changing LBF assemblages and evolving lineages, with some zonal boundaries related to global or local paleoenvironmental events. This will allow correlation across carbonate platforms in the tropical Americas at a higher resolution than previously possible.