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. 2022 Feb 9;8(6):eabj0944. doi: 10.1126/sciadv.abj0944

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Fig. 4. — Light blue circles indicate the Concordia ages of each sample. (A) Volcanic rock from the Cretaceous Madeng Formation. (B) Tuff from the upper part of the lower member of the Niubao Formation. (C to E) Tuffs from the middle member of the Niubao Formation. (F) Tuff from the lower member of the Dingqing Formation. MSWD, mean square weighted deviation. (G) Tuff from the middle member of the Dingqing Formation. (H and I) Tuffs from the upper member of the Dingqing Formation.