峨眉龙门洞上二迭统沙湾组剖面位于峨眉山脚的挖断山至龙门洞电站之间,所测剖面全长60余米,沙湾组的岩性下部为紫红色泥岩夹煤线,中部为黄绿色粗至细粒岩屑砂岩,上部为紫红色泥岩、粉砂岩夹煤线。沙湾组与上覆下三迭统地层呈整合接触,与下伏地层峨眉山玄武岩组呈平行不整合接触。 Emei Longmen hole Upper Permian Sandy Bay Section profile is located at the foot of Mount Emei Dugushan to Longmen Dong hydropower station, the measured section length of more than 60 meters, the lower part of Shawan Formation lithology purple sandstone mudstone line, the central For the yellow-green coarse to fine-grained litharge sandstone, the upper part of the magenta mudstone, siltstone coal line. The Shawan Formation is in integrated contact with the overlying Triassic strata, and is in parallel and unconformable contact with the underlying Emeishan basalts.