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During mid-Cretaceous times large amounts of organic carbon (C org ) became sequestered in `black shales', possibly due to `oceanic anoxic events' characterized by the development of an extended oxygen minimum zone (OMZ). Here, we provide the first direct evidence for an open ocean OMZ in the Cenomanian/Turonian (C/T) southern North Atlantic and in fact show that the base of the...
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