In the eastern part of Tianjin's Jinnan, Dagang, Tanggu, and other places. Shell embankment is now more than 1,000 7-year old remains of the oceans by marine debris and shells, tides, winds and waves of the role, and fine sand, silt, peat, mud embankment composed of thin clay-like landforms Piled up, with more or less parallel to the coast or a small angle. From To the sea are arranged in four shells embankment, reflecting different periods of coastline change. The first a shell embankment around the village to Dagang District Shen Qing Hua Huang Miao Zhuang County line, 5200-4000 years ago. No. 2 Zhang Guizhuang shell breakwater to Ju in the first-line Ge Zhuang, since 3800-3000, the embankments found Heritage Week and the Warring States Period. Section 3 seawalls shells from the gate to the Ninghe Lu Tai Qikou around 2500-1100 years ago. No. 4 shell embankment near the modern coastline, 700-500 years ago.
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