Abstract
Sediment records of the stable isotopic composition of N (δ15N) show light 15N values at several sites in the proto-North Atlantic during Oceanic Anoxic Event 2 (OAE 2) at the Cenomanian-Turonian transition (~94 Ma). The low δ15N during the event is generally attributed to anincrease in N2-fixation and incomplete uptake
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