Sir: Andrey Bekker and co-authors (Bekker et al., 2010) use a holistic approach to the deposition of iron formation (IF) by relating its genesis to a complex interplay of processes within the deep Earth, oceans, and biosphere. They comment (p. 469) that “In contrast to most previous studies, we suggest that no single parameter controlled iron-formation deposition.” The word “most” is critical here, since in a Discussion of IF genesis in Economic Geology nearly half a century ago (Trendall, 1965, p. 1069), I noted the need for a multifaceted approach with the words, “It is useless...

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