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The early Cambrian (ca. 542–520Ma) strata in South China record two prominent negative carbonate carbon isotope (δ 13 C carb ) excursions of early Nemakit–Daldynian (N–D) and early Tommotian ages. Across each of these excursions, carbonate and organic carbon isotopes (δ 13 C carb and δ 13 C org ) are strongly decoupled. Regional correlation across a...
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