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Swiss Journal of Palaeontology
Fig. 4 | Swiss Journal of Palaeontology

Fig. 4

From: Fluctuations of the oxygen minimum zone at the end of Oceanic Anoxic Event 2 in the Gulf of Mexico and the response of ammonites

Fig. 4

The Vallecillo section with inferred expansion (gray) and contraction (white) of the oxygen minimum zone. Left the Vallecillo section and its biostratigraphic zonation, based on I inoceramids and A ammonoids. Middle abundances of planktic foraminifers, inoceramids, ammonites and fishes. Right interpreted expansion and contraction of the oxygen minimum zone (OMZ), indicating hostile or improved conditions in the deeper water column (modified from Ifrim 2006, 2013; Ifrim and Stinnesbeck 2007, 2008; Ifrim et al. 2011a)

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