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沉积中心呈左行斜列，等厚线呈卵形封闭，三组走滑断裂系统影响和控制沉积及火山岩盆地的发育和分布，盆地呈菱形并以拉分性质为主，盆地中的地层层序显示内新外老的环形扩张结构，以及岩浆活动强烈等特征表明：下扬子区侏罗纪－早白垩世为一走滑引张盆地。进一步的研究将其分为两个演化阶段：碎屑沉积为主的早期阶段（Ｊ１＋２）和岩浆活动为特征的晚期阶段（Ｊ３～Ｋ１）。
The sedimentary center shows a left-lateral oblique column and the isopacholate line is oval-shaped. Three sets of strike-slip faulting systems influence and control sedimentation and the development and distribution of volcanic basins. The basins are rhombic and are dominated by pull-off strata. The stratigraphic layers The sequence shows that the ring expansion structure of Neo-Lao-Lao and strong magmatic activities indicate that the Jurassic-Early Cretaceous of the Lower Yangtze region was a strike-slip extension basin. Further research divides it into two stages of evolution: early stage (J1 + 2) dominated by clastic sediments and late stage (J3 ~ K1) characterized by magmatic activity.