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Summary
DescriptionShale color chart.png
English: This diagram shows the approximate color of shale of varying oxidation state and organic carbon content. The oxidation state is expressed as the mole fraction of ferrous iron to total iron. The region at upper left represents compositions unlikely to be found in nature. Based on Potter, Maynard, and Pryor (1980). Sedimentology of shale : study guide and reference source. New York: Springer-Verlag. ISBN0387904301.
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Captions
Color chart for shale based on oxidation state and organic carbon content