《Table 2 Summary of calculated U-Pb ages and their uncertainties》

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《中三叠世脊椎动物生物地层的高精度时间校准:铀-铅锆石法测定的中国肯氏兽动物群和永和鳄年代（英文）》

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Note:All dates are based on single-zircon CA-TIMS analyses.Uncertainties reported at 2σlevel.X.internal（analytical）uncertainty in the absence of all external or systematic errors；Y.incorporates the U-Pb tracer calibration error；Z.includes X and Y，as we

Volcanic ash samples and vertebrate fossils were collected from different stratigraphic horizons in the Ermaying and Tongchuan Formations from five localities in Shanxi Province，China（Table 1）.Extensive field prospecting for tetrapod fossils was undertaken at each locality to establish the correlative vertebrate biozone.Stratigraphic sections were measured at all localities to establish the stratigraphic position of each ash relative to lithostratigraphic markers and/or fossils.