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朝鲜西海岸环Ｙｏｕｎｇｊｏｎｇ岛强潮泥质沉积物含有微型（约１５０μｍ）菱铁矿固结物,其年代约为８ｋａＢ．Ｐ．。自生菱铁矿为聚集的球粒状结构,颗粒表面的菱面体发育良好,表明保存较好。地球化学分析显示,Ｍｇ（平均值２．６ｍｏｌ%）、Ｃａ（平均值９．４ｍｏｌ%）含量
Strong tidal shale deposits on the Youngjong Island in the western coast of North Korea contain miniature (about 150μm) siderite solids dating back to about 8kaB. P. . Self-born siderite aggregated spherical structure, rhombohedral particle surface well-developed, indicating that the preservation is better. Geochemical analysis showed that Mg (average 2.6 mol%), Ca (average 9.4 mol%)