The Middle Permian strata is well - developed in the Xiangxi area, Western Hubei.

鄂西香溪地区中二叠统发育良好.

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The beginning of Misellina - Brevaxina acme zone is considered as the lower limit of Middle Permian.

Misellina-Brevaxina顶峰带的出现是中二叠统的底界,Codonofusiella顶峰带的出现是上二叠统的底界.

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