Anaerobic nitrogen cycling on a Neoarchaean ocean margin
"A persistently aerobic marine nitrogen cycle featuring the biologically mediated oxidation of ammonium to nitrate has likely been in place since the Great Oxidation Event (GOE) some 2.3 billion years ago. Although nitrogen isotope data from some Neoarchaean sediments suggests transient nitrate availability prior to the GOE, these data are open to other interpretations. [...]"
Source: Earth and Planetary Science Letters
Authors: C.Mettam et al.