Sir: We welcome the comments by Alec Trendall (2012) and the chance to clarify statements made in our recent review paper (Bekker et al., 2010). His point of contention is focused on the semantics of iron formation (IF) nomenclature and classification, specifically the validity of, and criteria for, subdivision into Superior, Algoma, granular, and banded types. In addressing his comments, we place this nomenclature and classification into a broader perspective involving the history of IF studies, and then explore underlying genetic controls that formed the foundation for these early schemes.

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It is only in the last 40 to...

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