Herrle, J.O., Wilson, P.A. and Pälike, H.
High resolution benthic foraminiferal stable isotope records from the late early Oligocene.
8th International Conference on Paleoceanography (ICP) Programme Book.
8th International Conference on Paleoceanography
UMR 5805 EPOC, CNRS, Bordeaux 1 University, France.
The Oligocene (33.5-23.8 Ma) represents in many ways
the “neglected middle child” of Cenozoic palaeoceanography
– caught between the early Paleogene greenhouse and the
well-developed Neogene icehouse. This situation is attributed
to the view that the Oligocene marks a persistent interval of
relative stasis in palaeoclimate and biotic turnover, reflected in
deep-sea micropalaeontological communities by conservative
body plans, confusing taxonomy and low biostratigraphic
resolution. However, in some respects this interval represents
the most interesting episode of the Cenozoic
palaeoceanographic puzzle because it allows us to unravel the
processes that lie behind the transition from a world free of
large-scale continental icecaps and rapid eustatic sea-level
oscillations to one dominated by these climatic changes.
Here we present a high-resolution (~3 ka) epi-
(Cibicidoides grimsdalei) and infaunal (Oridorsalis
umbonatus) benthic foraminiferal stable isotope (oxygen,
carbon) record of the late Early Oligocene equatorial Pacific
(ODP Site 1218) between magnetochrons C11n.2n and C12n
(29.9-31 Ma) in order to assess and quantify on astronomical
timescales palaeoclimatic and palaeoceanographic changes.
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