Harold Lloyd James is widely recognized for his trail-blazing interpretations of the field relationships and petrology of the metamorphosed and structurally complex iron-rich sedimentary rocks known as “iron-formation.” Although his research focused on northern Michigan, the fundamental contributions he made there have proven applicable worldwide for the sedimentary iron deposits that constitute the bulk of the world’s iron ore resources. Prior to James’ work, the unusual chemical and mineralogical character of iron-formation was attributed to metamorphism and hydrothermal alteration of iron-rich carbonate sedimentary rocks. However, James peered through the veil of metamorphism and subsequent local oxidation, unraveling the spatial relations...

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