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连云海峡系指后云台山与东西连岛之间的海域。海峡北岸、南岸均由隆起的元古界坚硬的片麻岩、石英片岩以及混合片麻岩组成。自燕山运动以来,本区即有明显的断块差异性升降活动。特别是更新世以来,新构造运动升降,使峡区松散沉积经过了多次的侵蚀-堆积。由岸边到海峡中部,沉积厚度增大、层次增多,颗粒依次变细。除上新世较薄的泥岩、砂质泥岩外,皆为第四纪河湖相、河海交互相堆积,中部最大沉积厚度75米左右,水深4-6米。
Lianyun Strait refers to the area between the Yuntai Mountain and the East-West Island. The northern and southern banks of the Strait are composed of uplifted Proterozoic hard gneiss, quartz schist and mixed gneiss. Since the Yanshan Movement, there have been obvious differences in block-breaking movements in this area. Especially since the Pleistocene, the Neotectonic movement rose and lowered, resulting in multiple erosions and accumulation of loose sediments in the Gorge area. From the bank to the middle of the Strait, the sedimentary thickness increases and the layers increase, and the particles become thinner in turn. In addition to the Pliocene thin mudstone, sandy mudstone, all are Quaternary lacustrine facies, river and sea facies accumulation, the central deposition of the largest thickness of 75 meters, the depth of 4-6 meters.