Eocene-Oligocene faunal turnover in planktic Foraminifera, and Antarctic glaciation

Author(s): Keller, Gerta; MacLeod, Norman; Barrera, Enriqueta
Author Affiliation(s): Primary:
Princeton University, Department of Geological and Geophysical Sciences, Princeton, NJ, United States
Woods Hole Oceanographic Institute, United States
University of Michigan, United States
Volume Title: Eocene-Oligocene climatic and biotic evolution
Volume Author(s): Prothero, Donald R.; Berggren, William A.
Source: Eocene-Oligocene climatic and biotic evolution, Donald R. Prothero and William A. Berggren, p.218-244. Publisher: Princeton Univ. Press, Princeton, NJ, United States
Note: In English. 82 refs.; illus., incl. 1 table
Summary: Low-latitude planktic foraminiferal populations experienced a major faunal turnover between the late-middle to early-late Oligocene. This faunal turnover involved over 80% of planktic foraminiferal species and took place quasi-continuously over an interval of approximately 14 m.y. Stable isotope records and glaciomarine sediments from high-latitude southern ocean ODP Legs 113 and 119 provide evidence of major glaciation on East Antarctica during the late middle to late Eocene and early Oligocene. Carbon and oxygen isotopic gradients for planktic and benthic foraminiferal species reflect decreasing surface productivity and thermal stratification during this time. The remarkably close correspondence between these stable isotope records and planktic foraminiferal turnovers strongly suggests that changes in climate and productivity were the primary driving forces behind the gradual decline and eventual extinction of the Eocene planktic foraminiferal fauna.
Year of Publication: 1992
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Ancient ice ages; Antarctica; C-13/C-12; Carbon; Cenozoic; Eocene; Faunal studies; Foraminifera; Glacial geology; Glaciation; Invertebrates; Isotopes; Leg 113; Leg 119; Lower Oligocene; Marine environment; O-18/O-16; Ocean Drilling Program; Oligocene; Oxygen; Paleoclimatology; Paleogene; Planktonic taxa; Protists; Southern Ocean; Stable isotopes; Tertiary; Upper Eocene
Coordinates: S704954 S614837 E0030559 W0432706
S684114 S492407 E0855147 E0713936
Record ID: 2008129113
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States