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Biogeochemical controls on black shale deposition during the Frasnian-Famennian biotic crisis in the Illinois and Appalachian Basins, USA, inferred from stable isotopes of nitrogen and carbon

Stable IsotopesOrganic GeochemistryBiogeochemistryEngineeringOrganic-rich Sedimentary RockGeologyGeochemistryBlack Shale DepositionEarth ScienceFrasnian-famennian Biotic CrisisOrganic Petrology