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A geochemical study of Cryogenian (late Neoproterozoic) limestones from western Mongolia is presented, including δ 13 C (carbonate and kerogen), δ 18 O, 87 Sr/ 86 Sr and rare earth element data. Carbon isotope compositions confirm the existence of anomalously high δ 13 C in Cryogenian seawater with δ 13 C ca ...