Abstract
Twenty black shale samples, which are free from the influence of weathering, were collected from the Chengjiang Fauna-bearing horizon, central Yunnan Province, yielding a Pb-Pb isochron age of 534±60 Ma. Although this age is younger than both the Rb-Sr isochron age and 40Ar-39Ar age, it should represent the lower isotopic age limit of the Chengjiang Fauna.
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Chang, X., Chen, L., Hu, S. et al. Isotopic dating of the Chengjiang Fauna-bearing horizon in Central Yunnan Province, China. Chin. J. of Geochem. 26, 345–349 (2007). https://doi.org/10.1007/s11631-007-0345-7
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DOI: https://doi.org/10.1007/s11631-007-0345-7