筠连地区主要出露地层为二迭系及三迭系。其晚二迭世地层的下部为峨眉山玄武岩组,一般厚60至100余米;中上部为煤系,划分为两个组:下称筠连组,为湖相砂、泥岩沉积,伴生薄的铁矿层,仅见植物化石,一般厚80—120米;其上谓金鸡(土旁)组,为三角洲相或海陆 Junlian area is mainly exposed two strata and Triassic strata. The lower part of the Late Permian stratum is the Emeishan basalt group, generally 60 to 100 meters thick. The middle and upper part are coal series and are divided into two groups: the Junlian Formation, which is lacustrine sandstone and mudstone sedimentary and associated thin The iron ore layer, only see fossil plants, the general thickness of 80-120 meters; on that the rooster (soil) group, for the delta phase or sea and land