俄罗斯沿岸地区受到分别属于大西洋、北冰洋和太平洋的 1 4个海的海水冲刷 ,海岸线的总长度超过 60 0 0 0km。在更新世 ,这些盆地经历过不止一次的幅度不同的海平面的升降作用。在海退时期 ,广阔的陆架地区变干了 ,而在海侵时期 ,沿岸平原和低山岸区被海水淹没。在东北极海、鄂 The Russian coast was washed by seawater belonging to 14 seas belonging to the Atlantic, Arctic and Pacific Oceans respectively and the total length of the coastline exceeded 60,000 km. During the Pleistocene, these basins underwent more than one sea level rise and fall of differing amplitudes. During the recession, the vast shelf areas became dry, while during the transgression the coastal plains and the low mountain banks were inundated by sea water. In the northeast sea, E