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四川旺苍附近出露于二迭纪栖霞灰岩与志留纪页岩之间的灰岩、页岩和砂岩等,长期被误认为泥盆石炭系。1939年,侯德封、王现珩认为:旺苍枫香铺(现名燕子峡)有含腕足类化石Athyriscf.vittata Hall,Spirifer cf.vilis Grabau,Meris-tella?sp.的中泥盆统;寨巴河北(现名南木)有含植物化石的石炭-二迭系。解放后在川北工作的四川省地质局区测队也提及本区的泥盆石炭系。
Limestone, shale and sandstone, which were exposed near Wangcang in Sichuan Province between Permian Qixia limestone and Silurian shale, have long been mistaken for Devonian Carboniferous. In 1939, Hou Defeng and Wang Xianheng considered that: the Wangcang Fengxiangpu (now named Swallow Gorge) has the Middle Devonian with the brachiopods Athyriscf.vittata Hall, Spirifer cf.vilis Grabau and Merisella? Sp. Pakistan Hebei (now known as Namtso) fossil-bearing plant fossil - two Diego system. After the liberation in Sichuan Province Geological Bureau of the regional team also referred to the area Devonian Carboniferous.