Shen and Schidlowski (2000) present a C isotope profile from the Precambrian-Cambrian (PC-C) interval in east Yunnan for the placement of the PC-C boundary on the Yangtze Platform and for global correlation. We here challenge Shen and Schidlowski's (2000) chemostratigraphic correlation and point out important omissions and biostratigraphic errors in their paper.

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Omissions.Shen and Schidlowski (2000, p. 623) state that “no distinct shift has yet been reported for the isotope composition of carbon across the China marker A.” However, the authors fail to take into account the work of Brasier et al. (1990, and references therein), who...

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