摘要
At present, there are four principal dividing plans on the boundary between the Carboniferous and Permian, at home and abroad, i.e., the low er boundary of the Permian to be drawn (ⅰ) at the base of the Kasimovian stage. This work accepts the Leven and Scherbovieh’s dividing plan on the stage at 1978; (ⅱ) at the base of the As selian stage. This dividing plan is generally accepted by the stratigraphic and paleontologic workers; (ⅲ) at the base of the Sakmarian stage, and (ⅳ) at the base of the Artinskian stage. The stratotypic sections of most of the
