Using stable isotopes of carbon and oxygen in siderite nodules and lithology of host shales, one can recognize geochemical environments proposed by Berner in Devonian-Carboniferous sediments of the Appalachian Basin. His oxic, post-oxic, and sulfidic diagenetic environments are well represented; sediments of the methanic environment may be present, but the evidence is equivocal. The sulfidic sediments can be further subdivided into well laminated and bioturbated, corresponding to the presence of H 2 S in the overlying water in the first case but confined to the sediment pore waters in the second.--Journal abstract.

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