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Recent geochemical studies of the Doushantuo Formation (ca. 635–551Ma) in South China suggested that the Ediacaran ocean was strongly stratified, with an oxic surface layer above a euxinic wedge that was sandwiched within ferruginous deep waters. This ocean redox model, however, was derived largely from the data obtained from stratigraphic sections in the Yangtze Gorges area that, according to recent...
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