Zhu et al. claim that we fail to acknowledge Brasier et al. (1990), incorrectly cite the stratigraphy in Luo et al. (1991), and misplace the Precambrian-Cambrian (PC-C) boundary. Also, Zhu et al. seem to be puzzled by our C isotope data. However, these contentions can be easily refuted. We will show how Zhu et al. make numerous factual errors and incorrect inferences based upon our paper.

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Omissions. Unfortunately, Zhu et al. misinterpret the data in Brasier et al. (1990), which show little δ13C trend below marker A in the Meishucun section (Fig 1B)....

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