Pyritiferous basal marine shales of the early mid-Devonian Hamilton Group of New York State display an inverse relationship between pyrite abundance, as a proportion of the chlorite present, and the iron content of the chlorite. This relationship suggests that chlorite was a significant source of iron during pyritization. The data also suggest that chlorite was broadly segregated into an iron-rich fraction, occuring nearer the source, and one of lower iron content, found farther west.

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