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生物混生现象是指不同生物古地理区系的生物出现于同一地区的同时代地层中，表明它们曾同时或略为先后地生活或埋藏在一起。中国东北地区早二叠世时期出现明显的北方冷水动物群（归属北方大区准噶尔－兴安生物省）与特提斯暖水动物群（归属特提斯大区内蒙－吉林生物省）的混生现象；晚二叠世出现安加拉植物群（Ａｎ－ｇａｒａｆｌｏｒａ）与华夏植物群（Ｃａｔｈａｙｓｉａｎｆｌｏｒａ）的混生。对于这些生物混生的机制及阻隔生物迁移扩散的障岩的详细研究，对于解决中国北方二叠纪古海盆性状和南北板块最终缝合带的位置等问题具有重大意义。
Biomimicry refers to the presence of organisms of different biological paleo-geographical façades in contemporaneous formations in the same area, indicating that they lived or buried one after the other at the same time or slightly later. In the Early Permian period in Northeast China, obvious cold-water fauna (belonging to the Junggar-Xing’an Biosphere in the Northern Region) and the Tethys warm-water fauna (belonging to Inner Mongolia-Jilin Province of Tethys) In Late Permian, there was a mixture of An-garaflora and Cathaysianflora. The detailed study of these bioconjugation mechanisms and the barriers that block the migration of biological migration is of great significance for solving the problems of the ancient Permian basin features and the location of the final suture zone in the northern and southern parts of China.