This formation is dominated by a set of sandstone-mudstone dark clastic rock series which belongs to marginal marine deposit at the end of the Gondwana Carboniferous-Permian glacier period.

• 该组主要为一套砂岩－泥岩的暗色碎屑岩系，属冈瓦纳石炭－二叠纪冰川末期的边缘海沉积。