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- [25] Rise in seawater sulphate concentration associated with the Paleoproterozoic positive carbon isotope excursion:: evidence from sulphate evaporites in the ∼ 2.2-2.1 Gyr shallow-marine Lucknow Formation, South Africa (vol 20, pg 108 2008)TERRA NOVA, 2008, 20 (03) : 252 - 252Schroeder, S.Bekker, A.Beukes, N. J.Strauss, H.van Niekerk, H. S.
