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前言吉南晚元古代地层发育良好,与苏皖、山东、蓟县、辽南均属同一构造单元,系地台型沉积。吉南晚元古代地层位于华北地台东北边缘,出露于浑江流域、鸭绿江流域,抚民屯—孤山子一带,以浑江流域出露的层序最全,其时限介于818～570百万年之间。浑江流域青沟子剖面、大阳岔剖面是两条露头良好,层序连续的自然剖面,剖面底界超覆在中元古界老岭群之上,而顶界又被早寒武世产小壳化石含磷页岩所覆盖,构成衔接南北方层型
Preface The Late Archean of Ancient Geological Age is well developed and belongs to the same tectonic unit with Jiangsu, Anhui, Shandong, Jixian and Liaonan. The Late Ancient Archean of South China is located on the northeastern edge of North China Platform and is exposed in the areas of Hunjiang River, Yalu River and Fumin Tuen - Gushanzi. The sequence of the Hunjiang River Basin is the most complete. The time limit lies between 818-570 Between millions of years. The Qinggouzi section of the Hunjiang River Basin and the Dayangcha section are two natural profiles with well-outcropped and continuous sequences. The bottom boundary overlaps with the Middle Proterozoic Laoling Group and the top boundary is replaced by the Precambrian Small shell fossil shale covered by phosphorus, constitute the convergence of North-South layer type