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中扬子地区下三叠统大冶组主要由碳酸盐岩和碎屑岩组成。用单因素分析综合作图法，做出了岩相古地理图１幅。在早三叠世大冶期，整个中扬子海域具“六分”特征、即自北而南依次为北部碳酸盐盆地、北部碳酸盐斜坡、浅水碳酸盐台地、南部碳酸盐斜坡、南部碳酸盐盆地、东南部碎屑滨海。在该时期内，从早到晚，沉积水体不断变浅，至末期，海域普遍抬升而变为碳酸盐台地。
The Lower Triassic Daye Formation in the middle Yangtze region consists mainly of carbonate rocks and clastic rocks. Using single factor analysis and integrated mapping method, a lithofacies paleogeography map was made. In the Early Triassic Daye period, the whole middle Yangtze Sea has the characteristics of “six points”, ie, the northern carbonate basin, the northern carbonate basin, the shallow carbonate platform, the southern carbonate slope , Southern carbonate basin, southeast detritus coastal. During this period, from early to late, the sedimentary water body gradually lightened, and in the end, the sea area generally rose and became a carbonate platform.