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Many proposed extinction mechanisms for the Late Devonian (Frasnian–Famennian boundary — FFB) mass extinction event include the spread of anoxia in bottom waters during the two Kellwasser anoxic events, which have in turn been linked to changes in continental weathering, volcanic/hydrothermal fluxes, sea-level and climate change. Although there is strong evidence for bottom water anoxia in epicontinental seas at tropical/equatorial palaeolatitudes, the global extent of these changes is poorly understood, largely due to the lack of an oceanic and high-latitude record. In this study, marine δ³⁴S_sulphate and δ¹⁸O_sulphate records, derived from the analysis of carbonate-associated sulphate (CAS), were constructed from FFB sections in Belgium and Poland in order to examine the effect of the postulated changes in ocean redox conditions on the global sulphur cycle. The results reveal no overall changes in …