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吉林省延边地区早二叠世晚期—晚二叠世早期存在着开山屯、解放村、青沟子等三处不同类型的植物群。前者属华夏植物群，中间为华夏与安加拉混生植物群，后者则是安加拉植物群。反映出和龙地块北部陆缘活动带、兴凯地块西部陆缘活动带、佳木斯地块东南部陆缘活带这三者鼎足而立的古地理展布格局。阐明这三类不同植物群的古植物地理区的属性，不仅藉以证明上述三地块间各自陆缘活动带的存在及其相互关系，且将为解决延边地区争论至今的二叠纪岩石地层的划分及对比提供新的思路，亦对该区二叠纪时期岩石圈地壳的演化及造山运动的过程有所启迪
There are three different types of flora such as Kaishantun, Jiefang and Qingougou in the Early Permian-Late Permian in the Yanbian area of Jilin Province. The former belongs to the Chinese flora, the middle is the mixed flora of China and Angara, the latter is Angara flora. It reflects the palaeogeographic distribution pattern of the three continental geotectonic activities in the north of the Helong block, the western continental margin belt of the Xingkai block and the continental margin belt of southeastern Jiamusi block. The elucidation of the attributes of the Palaeogeography of these three different flora not only proved the existence and interrelationship of the respective marginal active zones between these three blocks, Division and contrast to provide new ideas, but also on the Permian period of lithospheric crustal evolution and orogenic processes have enlightenment