古海滩砾石层与海平面变动

在我国华北平原和长江三角洲等构造沉降区,已发现4—5个第四纪海相层和多条古海岸线。而在构造上升区沿海虽然找到了多级台地,但因缺乏可靠的海相沉积物,难以把它们定为海成阶地,山东半岛北部就是如此。因此,寻找古海相沉积就成为构造上升的沿海地区研究海平面变动的关键。到目前为止,已先后在辽东半岛、庙岛群岛等地区高于现今海平面的阶地上发现了海相层。近年

FOSSIL BEACH GRAVEL AS A RECORD OF SEA LEVEL CHANGE

The fossil gravels discovered in coastal zones of Qisha, Guangxi Province and Huangdaao and Feishaao, Zhejiang province are determined by their roundness, distribuion, relationship with around sediments, correlation of boring cores and ¹⁴C dating as records of high sea levels. Ages of these gravels as dated by wood contained in the gravels are Late Pleistocene and Holocene (36 200±200, 2588±129), so the gravels located approximately at the same altitude (2-4m) are different in age.