Calcareous Nannoplankton Response to Late Albian Oceanic Anoxic Event 1d in the western North Atlantic
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Comment on "Calcareous nannoplankton response to surface-water acidification around Oceanic Anoxic Event 1a".
Erba et al. (Reports, 23 July 2010, p. 428) attributed calcareous nannofossil morphology and assemblage changes across Cretaceous Oceanic Anoxic Event 1a to the effects of surface ocean acidification. We argue that the quality of carbonate preservation in these sequences, the unsupported assumptions of the biotic response to acidity, and the absence of independent proxy estimates for ocean pH o...
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