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吉林省南部寒武、奥陶系属华北型。主要分布在鸭绿江、浑江和三统河流域。追溯研究历史,早在一九三六年日人矢部茂将鸭绿江流域的寒武——奥陶系称之为“乐浪系”(古期古生代层)。一九四六年斋藤林次进一步将浑江流域的寒武——奥陶系分为三层,最上部为寒武系上统——奥陶系石灰岩、镁质石灰岩层,并错误地将元古界浑江群中的八道江组叠层石灰岩亦划入奥陶系中。因而无从谈起寒武奥陶系界线的研究。华北和辽宁等地五十年代及以往寒武、奥陶系界线划分的各种方案(表1)在区内亦有人做过研讨与对比。
Cambrian in southern Jilin Province, Ordovician belongs to the North China type. Mainly distributed in the Yalu River, Hunjiang River and the Three River Valley. Trace back to the study of history, as early as 1936 Yabei Mao on the Yalu River basin Cambrian - Ordovician known as the “Le Long system” (paleozoic Paleozoic). In 1946, Saito further divided the Cambrian-Ordovician into three layers in the Hunjiang River basin, with the uppermost part being the Cambrian Upper Ordovician limestone and magnesian limestone layer and mistakenly The Proterozoic Hunjiang Group in the Badaogang Formation strata limestone also into the Ordovician. Therefore, it is impossible to talk about the research on the Ordovician boundary of Cambrian. Various programs (Table 1) dividing the boundary between the Cambrian and Ordovician in the 1950s and in the past in North China and Liaoning Province have also been discussed and compared in the region.