江苏下扬子区的海相中—古生界构造演化经历了前扬子板块、稳定地台和西太平洋活动陆缘等三大阶段。
Marine Meso-Paleozoic structures in the region have undergone three evolution stages of Pre-Yangzi Plate, stable platform and West Pacific active continental margin.
古新世晚期由于太平洋板块洋脊俯冲，日本海(西部)第一次拉张。
Due to the subduction of Pacific Plate at late Palaeocene, the western part of Japan Sea was pulled-apart.
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