International Union of Geological Sciences

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Shen SZ, Yuan DX, Henderson CM, Lambert LL, Zhang YC, Erwin DH, Ramezani J, Wang XD, Zhang H, Wu Q, Wang WQ, Hearst JM, Chen J, Wang Y, Qie WK, Qi YP, Wardlaw BR.  The Global Stratotype Section and Point (GSSP) for the base of the Capitanian Stage (Guadalupian, Middle Permian).  Episodes 2022;45:309-331.