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关于上、厂二叠统界线问题,众说纷纭。苏联乌拉尔山西坡,上、下二叠统界线放在乌非姆阶与孔谷阶之间,北美德克萨斯地区,上、下二叠统的界线定在瓜德鲁普阶沃德组的底部,伊朗、苏联外高加索上、下二叠统的界线,大致放在Cancellina带与Misellina带之间。上述地区所谓上、下二叠统的界线实际仅相当于我国下二叠统茅口阶与栖霞阶的分界,或位于栖霞阶的上部。
Opinions are divided on the Permian boundary issue. On the western slope of the Urals in the Soviet Union, the upper and lower Permian boundaries lie between the Uffian and Konggou steps. In the North American-Texas region, the upper and lower Permian boundaries are set at the bottom of the Guadeloupe Ward Formation , Iran, the Soviet Union, the Upper and Lower Permian boundaries of the Soviet Caucasus, roughly between the Cancellina and Misellina belts. The so-called upper and lower Permian boundaries in the above-mentioned areas are actually only equivalent to the boundary between the Maokou stage and the Qixia stage in the Lower Permian, or the upper part of the Qixia stage.