The Lower Holocene in the Xiaoshan-Yuhang area, Zhejiang, is composed of fine sand, silt and clay beds. They are rich in organic matter and constitute an important "gas sourceformation".
This spongy tissue serves as a source of calcium for eggshell formation.
这种海绵状组织是形成蛋壳的钙质来源。
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Scientists believe water activity affected this plateau after the formation of the nearby canyons. Although the source of water and sediment remains uncertain.