Important insight into the relationship between de-oxygenation and warming can be obtained from the geological record, but evidence is limited because few ocean oxygenation records are available for past greenhouse climate conditions. We use I/Ca in benthic foraminifera to reconstruct late Paleocene through early Eocene bottom and pore-water redox conditions in the South Atlantic and Southern Indian Oceans, and compare our results with those derived from Mn speciation and the Ce anomaly in fish teeth.

Supplement to: Zhou, Xiaoli; Thomas, Ellen; Winguth, Arne M E; Ridgwell, Andy; Scher, Howie D; Hoogakker, Babette A A; Rickaby, Rosalind E M; Lu, Zunli (2016): Expanded oxygen minimum zones during the late Paleocene-early Eocene: Hints from multiproxy comparison and ocean modeling. Paleoceanography