在详细野外观察、追索和室内多学科手段的交叉和综合地层学研究的基础上,将下扬子区海相下、中三叠统划分出5个三级层序,提出碳酸盐缓坡陆架背景下露头层序地层学研究的一般方法,总结了下扬子区早-中三叠世主体海退背景下的层序发育型式和规律,建立跨越台地边缘不同古地理相带的层序地层和年代地层格架. Based on the study of the cross-field and comprehensive stratigraphy of detailed field observation, recourse and multidisciplinary methods in the interior, five third-order sequences are defined under the Triassic in the Lower Triassic, and a carbonate ramp In the background, the general method of outcrop sequence stratigraphy study is summarized. The types and regularities of sequence development in the background of early-middle Triassic subduction of the Lower Yangtze region are summarized, and the sequence stratigraphy Chronostratigraphy.