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In this issue Bellefroid and others (2019) combine carbonate stratigraphy and REE+Y geochemistry to characterize Mid-Proterozoic paleo-marine redox gradient in the Muskwa Assemblage, NE British Columbia, Canada. Bellefroid and others (2019) show that using detailed carbonate stratigraphy to define paleo-depth, negative Ce/Ce* anomalies, which are indicative of oxic conditions, are restricted to within storm-wave base, consistent with globally low oxygen in the ocean-atmosphere system for this time period. Photo by Eric Bellefroid. See Bellefroid and others p. 122–157.