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1987—1989年浅地层测量结果表明,南黄海海底存在许多埋藏古河道、古湖泊、古三角洲,它们组成一个完整的水系。据矿物分析和化学成分分析,北部的古河道为古黄河水系,南部的为古长江水系,二者有可能一度汇合于南黄海中部。它们可能形成于2.5—0.9万年以前的低海面时期。成山角东部的下部地层中发现更老的古河道,可能为中更新世古黄河河床。在南黄海中部80m水深处发现了低海面时期的古黄河、古长江三角洲,那里约为2.5万年以前的古海岸线。
The shallow formation measurements from 1987 to 1989 show that there are many buried ancient river courses, ancient lakes and ancient deltas at the bottom of the South Yellow Sea, which form a complete water system. According to mineral analysis and chemical composition analysis, the ancient river in the north is the ancient Yellow River and in the south is the ancient Yangtze River. The two may once converge in the central part of the southern Yellow Sea. They may have formed in the low seas of 2.5 to 90,000 years ago. The older ancient channel found in the lower strata of eastern Chengshanjiao may be the Middle Pleistocene ancient Yellow River bed. At the depth of 80 m in the central part of the southern Yellow Sea, the pale-Yellow Sea and the ancient Yangtze Delta were discovered during the low sea level, with ancient coastlines about 25,000 years ago.