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The existing δ13C data in the Cambrian from different regions of the world are analyzed here. There are four well-documented carbon isotope excursions with global significance. In ascending order, they are: (1) a large negative excursion, comparable to “BACE” (BAsal Cambrian Carbon isotope Excursion) event, which occurs near the Precambrian-Cambrian boundary with a magnitude of 4‰–10‰ (PDB); (2)...
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