Strata of Permian age are fairly well developed in the Liangshan region,S. Shensi. They differ in some degree from those of South and SouthwesternChina, particularly in their upper portions which are almost entirely composedof limestones. The subdivisions adopted here are as follows(in descending order): Upper Permian-Lopingian Strata of Permian age are fairly well developed in the Liangshan region, S. Shensi. They differ in some degree from those of South and Southwestern China, particularly in their upper portions which are almost entirely composed of limestones. The subdivisions adopted are as follows (in descending order): Upper Permian-Lopingian