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New isotope data obtained from relatively conformable, carbonate-rich strata of the Ediacaran Yangtze platform in South China reveal substantial δ 13 C variability. In platform sections, four negative δ 13 C anomalies with a nadir down to ≤−8‰ (PDB) are present in the interval between the cap carbonate level (∼635 Ma) and the Precambrian/Cambrian boundary (∼542 Ma), while in slope...
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